What does it mean?

This diagnostic trouble code (DTC) is a generic powertrain code, meaning it applies to OBD-II equipped vehicles. Although generic, specific repair steps may vary by make/model.

The throttle position sensor is a potentiometer that measures how much the throttle plate is open. When the throttle is opened, the reading (measured in volts) increases.

The powertrain control module (PCM) is the main computer controlling the vehicle and it provides a 5-volt reference signal to the throttle position sensor (TPS) and usually a ground as well. A general measurement is: at idle = 0.5 Volts; at full throttle = 4.5 Volts. If the PCM detects that the throttle angle is higher or lower than it should be for a specific RPM, it will set this code. The C refers to a particular circuit, sensor, or area of a particular circuit.

Potential Symptoms

Symptoms of a P0226 trouble code may include:

• Illumination of the Malfunction Indicator Lamp (MIL) (Check Engine Light or Service Engine Soon light)
• Intermittent stumbling during acceleration or deceleration
• Puff of black smoke during acceleration
• No start condition

A P0226 code can mean that one or more of the following events have occurred:

1. TPS has an intermittent open or short internally
2. Harness rubbing and causing an open or short in the wiring
3. Poor connection to the TPS
4. Faulty PCM (less likely)
5. Water or corrosion in the connector or sensor

Possible Solutions

1. If you have access to a scan tool, see what the idle and WOT (wide open throttle) readings are for the TPS. Check if they are close to the specifications mentioned above. If not, replace the TPS and recheck.

2. Look for an intermittent open or short in the TPS signal. To do this, you cannot use a scan tool. You will need an oscilloscope. The reason is that scan tools take samples of many different readings over one or two data lines and might miss an intermittent break. Connect your oscilloscope and watch the signal. It should sweep up and down smoothly without glitches or spikes.

3. If no problem was found, perform a wiggle test. To do this, wiggle the connector and harness while observing the pattern. Does it drop out? If yes, replace TPS and recheck.

4. If you have no TPS signal, check for the 5-volt reference at the connector. If it is present, check if the ground circuit is open or shorted.

5. Make sure the signal circuit is not 12V. It should never have battery voltage. If it does, trace the circuit for a short and repair.

6. Look for water in the connector and replace TPS if necessary.

What does it mean?

This diagnostic trouble code (DTC) is a generic powertrain code, meaning it applies to OBD-II equipped vehicles. Although generic, specific repair steps may vary by make/model.

A P0227 code means the vehicle’s computer has detected that the throttle position sensor (TPS) is reporting too low voltage. On some vehicles, this lower limit is 0.17 to 0.20 volts (V). The C refers to a particular circuit, sensor, or area of a particular circuit.

 

Did you adjust it during installation? If the signal value is below 0.17V, the PCM sets this code. This could be an open circuit or a short to ground in the signal circuit. Or you may have lost the 5-volt reference voltage.

Symptoms

Symptoms may include:

Rough or low idle
Stumbling
Surging
No/little acceleration
Other symptoms may also be present

Causes

A P0227 code can mean one or more of the following has occurred:

TPS not securely mounted
TPS circuit shorted to ground or another wire
Faulty TPS
Damaged computer (PCM)

Possible Solutions

Here are some recommended troubleshooting and repair steps:

Carefully inspect the throttle position sensor (TPS), wiring connector, and wiring for breaks, etc. Repair or replace as needed
Check voltage at the TPS (refer to your vehicle’s service manual for specific information). If voltage is too low, it indicates a problem. Replace if necessary.
If recently replaced, the TPS may need adjustment. On some vehicles, installation instructions require the TPS to be properly aligned or adjusted, consult a repair manual for details.
If there are no symptoms, the problem may be intermittent and clearing the code may temporarily resolve the issue. If so, you should definitely check wiring to ensure it’s not rubbing against anything, grounding, etc. The code may return.

What Does It Mean?

This diagnostic trouble code (DTC) is a generic powertrain code, meaning it applies to vehicles equipped with OBD-II. Although generic, specific repair steps may vary by make/model.

When I encountered a stored P0228 code, I found it means the Powertrain Control Module (PCM) detected a high voltage input from the Throttle Position Sensor (TPS) circuit or a specific Pedal Position Sensor (PPS) circuit. C refers to a particular circuit, sensor, or area of a specific circuit.

Consult a reliable vehicle information source (All Data DIY will work) for details about the vehicle in question. This code is only used in vehicles with Drive-By-Wire (DBW) systems.

The PCM controls the DBW system using a throttle actuator motor, one or more pedal position sensors (sometimes called accelerator pedal position sensors), and multiple throttle position sensors. The sensors are supplied with reference voltage (typically 5 volts) and ground. Most TPS/PPS sensors are potentiometer-type and complete their respective circuits. A pivoting extension, on the accelerator pedal or throttle shaft, operates the sensor contacts. The sensor’s resistance changes as the contacts move across the sensor’s circuit board, causing variations in circuit resistance and signal input voltage to the PCM.

If the signal input voltage exceeds a programmed limit, for an extended period under certain conditions, a P0228 code will be stored and a Malfunction Indicator Lamp (MIL) may illuminate.

Symptoms

/ Severity

When this code is stored, the PCM typically enters limp mode. Engine acceleration will be severely limited (if not disabled) in this mode. Symptoms of a P0228 code may include:

Stuck throttle (at any RPM)
Limited or no acceleration
Engine stalling at idle
Hesitation during acceleration
Inoperative cruise control

Causes

Possible causes of this engine code include:

Open or shorted circuits between TPS, PPS, and PCM
Faulty TPS or PPS
Corroded electrical connectors
Faulty cable actuator motor

Diagnostic and Repair Procedures

A good starting point is always checking Technical Service Bulletins (TSBs) for your specific vehicle. Your issue might be a known problem with a published manufacturer fix, saving time and money during diagnosis.

I would access a diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle information source like All Data (DIY) to diagnose a P0228 code.

My first diagnostic step would be a visual inspection of all cables and connectors related to the system. I also like checking the throttle plate for signs of carbon buildup or damage. Excessive carbon buildup, keeping the throttle body open at startup, can cause a P0228 code to store. Clean carbon from the throttle body per manufacturer recommendations and repair or replace faulty wiring/components as needed, then retest the DBW system.

Next, I connect the scanner to the vehicle’s diagnostic port and retrieve all stored trouble codes. I note them in case I need the order codes were stored. I also like saving all related freeze frame data. These notes can prove helpful if P0228 proves intermittent. Now I clear the codes and test drive the vehicle. If the code resets, I continue my diagnosis.

Voltage spikes and inconsistencies between TPS, PPS, and PCM can be detected using scanner data stream. Narrow the data stream to display only relevant data for faster response. If no spikes/inconsistencies are detected, use the DVOM to retrieve live data from each sensor individually. To get live data with DVOM, connect test leads to appropriate signal and ground circuits and observe DVOM display while operating DBW. Look for voltage spikes when throttle is slowly operated from closed to wide-open position. Voltage typically ranges from 0.5 volts at closed throttle to 4.5 volts at wide-open throttle. If spikes or other irregularities are detected, suspect the tested sensor is faulty. An oscilloscope is also an excellent tool for testing sensor operation.

Additional Diagnostic Notes:

Some manufacturers require throttle body, throttle actuator motor, and all throttle position sensors be replaced together

What does it mean?

This generic powertrain diagnostic trouble code (DTC) generally applies to all OBD-II equipped vehicles with a supercharger air cooler. This may include, but is not limited to, vehicles from Ford, Chevy, Mazda, Toyota, etc.

In forced induction systems, they use a supercharger air cooler or what I will call an intercooler (IC) to help cool the boosted air used by the engine. These operate similarly to a radiator.

In the case of the intercooler, instead of cooling antifreeze, it cools the air to produce a more efficient air/fuel mixture, which in turn leads to better fuel economy, improved performance, etc. The intercooler is part of the boost pressure side of the induction system. The bypass valve is used, as its name suggests, to allow air to bypass the intercooler to be vented to the atmosphere and/or recirculated. The Engine Control Module (ECM) uses it to adjust the valve based on current engine conditions and needs.

The ECM illuminates the Check Engine light with P022A and related codes when it monitors a condition outside a specific range in the intercooler bypass control circuit and/or system. This code can be triggered by a mechanical and/or electrical fault. If I had to guess here, I would lean towards a mechanical issue likely being the problem. That being said, either is possible.

P022A Supercharger Air Cooler Bypass Control Circuit Open code is set when the ECM detects a general fault and/or an open in the circuit.
How severe is this DTC?

The severity in this case would be moderate. You don’t want to leave this issue unattended as it could evolve into something much more serious fairly quickly. Keep in mind that problems do not improve over time unless corrected. Engine damage is expensive, almost every time, so if you have exhausted your abilities, take the vehicle to a reputable repair center.
What are some of the symptoms of the code?

Symptoms of a P022A engine code may include:

Poor engine performance
Vehicle entering “limp mode”
Engine misfire
Poor fuel economy

What are some of the common causes of the code?

Causes

of this code may include:

Bypass valve stuck open/closed
Obstruction in the operational movement range of the bypass valve
Open in the circuit (P022A)
Broken or damaged wiring harness
Faulty fuse/relay
ECM problem
Pin/connector issue. (e.g., corrosion, broken locking tab, etc.)

What Does It Mean?

This generic powertrain diagnostic trouble code (DTC) generally applies to all OBD-II equipped vehicles with a supercharger air cooler. This may include, but is not limited to, vehicles from Ford, Chevy, Mazda, Toyota, etc.

In forced induction systems, they use a supercharger air cooler or what I will call an intercooler (IC) to help cool the boosted air used by the engine. These operate similarly to a radiator.

In the case of the IC, instead of cooling antifreeze, it cools the air to produce a more efficient air/fuel mixture, which in turn leads to better fuel economy, better performance, etc. The IC is part of the boost pressure side of the induction system. The bypass valve is used, as its name implies, to let air bypass the intercooler to be vented to the atmosphere and/or recirculated. The Engine Control Module (ECM) uses it to adjust the valve based on current engine conditions and needs.

The ECM illuminates the Check Engine light with P022B and related codes when it monitors a condition outside of a specific range in the intercooler bypass control circuit and/or system. This code can be triggered by a mechanical and/or electrical fault. If I had to guess here, I would lean towards a mechanical issue likely being the problem. That being said, either is possible.

P022B Supercharger Air Cooler Bypass Control Circuit Low code is set when the ECM detects an electrical value lower than the desired value.
How severe is this DTC?

The severity in this case would be moderate. You do not want to leave this issue unattended as it could evolve into something much more serious fairly quickly. Keep in mind that problems do not improve over time unless corrected. Engine damage is expensive, almost every time, so if you have exhausted your abilities, take the vehicle to a reputable repair center.
What are some of the symptoms of the code?

Symptoms of a P022B engine code may include:

Poor engine performance
Vehicle entering “limp mode”
Engine misfire
Poor fuel economy

What are some of the common causes of the code?

Causes

of this code may include:

Bypass valve stuck open/closed
Obstruction in the operational movement range of the bypass valve
Broken or damaged wiring harness
Faulty fuse/relay
ECM problem
Pin/connector issue. (e.g., corrosion, broken locking tab, etc.)

What are the P022B troubleshooting steps?

Be sure to check the Technical Service Bulletins (TSBs) for your vehicle. Access to a known fix can save you time and money during diagnosis.
Tools

When working on the forced induction system, you may need:

OBD code reader
Hose clamp pliers
Lubricant
Multimeter
Basic socket set
Ratchet and wrench sets
Basic screwdriver set
Rags/shop towels
Battery terminal cleaner
Service manual

Safety Tips

Let the engine cool down
Chock the wheels
Wear PPE (Personal Protective Equipment)

NOTE: ALWAYS check and record the integrity of your battery and charging system before proceeding with troubleshooting.
Basic Step #1

Locate your supercharger air cooler bypass control valve by following the charge piping going to your intercooler (IC); it may be mounted directly on the charge pipe. Depending on your specific make and model, you may find your IC mounted in your front bumper, front fenders, or perhaps directly under the hood among many other possible locations. Once the valve is located, inspect for any obvious physical damage.

NOTE: Ensure the engine is off.
Basic Step #2

It may be straightforward to remove the valve from the vehicle completely to check its functionality. Especially recommended if the P024B code is active. Once removed, inspect for any obstruction in the valve’s range of motion. If possible, clean the valve before reinstalling it.

NOTE: Always refer to the service manual first as this may not be possible or recommended elsewhere on your vehicle.
Basic Tip #3

The bypass valve harness may be routed through areas exposed to the elements. These areas should be closely inspected for nicks, cuts, signs of corrosion, etc., in the wires involved in the circuit.

NOTE: Ensure the battery is disconnected before performing any electrical repairs.
Basic Step #4

Depending on your scan tool, you can check the valve’s functionality by commanding it and observing its range of motion. If accessible, you can disconnect one end of the valve to see the moving parts. Using your scan tool, fully open and close the valve while observing the mechanical operation of the valve itself. If you notice the valve sticking and nothing is obstructing it, the valve is likely faulty. In this case, you can try replacing it. Ensure the manufacturer also recommends a new valve in this instance. Refer to the manual.
Basic Step #5

You will want to rule out any electrical issues in the involved harness. To do this, you may need to disconnect it at both the valve and the ECM. Using your multimeter, check the circuit’s integrity by performing many basic electrical tests (i.e., continuity). If everything checks out, there may be input tests you could perform involving testing the connector at the valve to verify ECM functionality with the valve.

What Does It Mean?

This generic powertrain diagnostic trouble code (DTC) generally applies to all OBD-II equipped vehicles with a supercharger air cooler. This may include, but is not limited to, vehicles from Ford, Chevy, Mazda, Toyota, etc.

In forced induction systems, they use a supercharger air cooler or what I will call an intercooler (IC) to help cool the boosted air used by the engine. These operate similarly to a radiator.

In the case of the IC, instead of cooling antifreeze, it cools air to produce a more efficient air/fuel mixture, which in turn leads to better fuel economy, better performance, etc. The IC is part of the boost pressure side of the induction system. The bypass valve is used, as its name implies, to let air bypass the intercooler to be vented to the atmosphere and/or recirculated. The Engine Control Module (ECM) uses it to adjust the valve based on current engine conditions and needs.

The ECM illuminates the Check Engine light with P022C and related codes when it monitors a condition outside a specific range in the intercooler bypass control circuit and/or system. This code can be triggered by a mechanical and/or electrical fault. If I had to guess here, I would lean towards a mechanical issue likely being the problem. That being said, either is possible.

P022C Supercharger Air Cooler Bypass Control Circuit High code is set when the ECM detects an electrical value higher than the desired value.
How severe is this DTC?

The severity in this case would be moderate. You don’t want to leave this issue unattended as it could evolve into something much more serious fairly quickly. Keep in mind that problems don’t improve over time unless corrected. Engine damage is expensive, almost every time, so if you have exhausted your abilities, take the vehicle to a reputable repair center.
What are some of the symptoms of the code?

Symptoms of a P022C engine code may include:

Poor engine performance
Vehicle entering “limp mode”
Engine misfire
Poor fuel economy

What are some of the common causes of the code?

Causes

of this code may include:

Bypass valve stuck open/closed
Obstruction in the operational movement range of the bypass valve
Broken or damaged wiring harness
Faulty fuse/relay
ECM problem
Pin/connector issue. (e.g., corrosion, broken locking tab, etc.)

What are the P022C troubleshooting steps?

Be sure to check Technical Service Bulletins (TSBs) for your vehicle. Accessing a known fix can save you time and money during diagnosis.
Tools

When working on the forced induction system, you may need:

OBD code reader
Hose clamp pliers
Lubricant
Multimeter
Basic socket set
Ratchet and wrench sets
Basic screwdriver set
Rags/shop towels
Battery terminal cleaner
Service manual

Safety Tips

Let the engine cool down
Chock the wheels
Wear PPE (Personal Protective Equipment)

NOTE: ALWAYS check and record the integrity of your battery and charging system before proceeding with troubleshooting.
Basic Step #1

Locate your supercharger air cooler bypass control valve by following the charge piping going to your intercooler (IC); it may be mounted directly on the charge pipe. Depending on your specific make and model, you might find your IC mounted in your front bumper, front fenders, or perhaps directly under the hood among many other possible locations. Once the valve is located, inspect for any obvious physical damage.

NOTE: Ensure the engine is off.
Basic Step #2

It may be straightforward to remove the valve from the vehicle completely to check its functionality. Especially recommended if the P024B code is active. Once removed, inspect for any obstruction in the valve’s range of movement. If possible, clean the valve before reinstalling it.

NOTE: Always refer to the service manual first, as this may not be possible or recommended for your specific vehicle.
Basic Tip #3

The bypass valve harness may be routed through areas exposed to the elements. These areas should be closely inspected for nicks, cuts, signs of corrosion, etc., in the wires involved in the circuit.

NOTE: Ensure the battery is disconnected before performing any electrical repairs.
Basic Step #4

Depending on your scan tool, you can check the valve’s functionality by commanding it and observing its range of movement. If accessible, you can disconnect one end of the valve to see the moving parts. Using your scan tool, fully open and close the valve while observing the mechanical operation of the valve itself. If you notice the valve sticking and nothing is obstructing it, the valve is likely faulty. In this case, you can try replacing it. Ensure the manufacturer also recommends a new valve in this scenario. Refer to the manual.
Basic Step #5

You’ll want to rule out any electrical issues in the involved harness. To do this, you may need to disconnect it at both the valve and the ECM. Using your multimeter, check the circuit’s integrity by performing many basic electrical tests (i.e., continuity). If everything checks out, there may be input tests you could perform involving testing the connector at the valve to verify ECM functionality with the valve.

What Does Code P022D Mean?

The generic diagnostic code P022D applies to OBD-II equipped vehicles with a charge air cooler (intercooler), such as those from Ford, Chevy, Mazda, Toyota, etc.

In forced induction engines, compressed air is cooled by an intercooler to improve performance and efficiency. The bypass system allows air to bypass this intercooler when necessary, controlled by the Engine Control Module (ECM).

Code P022D is recorded when the ECM detects a malfunction or an open circuit in the circuit B of this bypass valve. The cause can be electrical and/or mechanical. In practice, it is often a mechanical problem.

🔧 Note: “Circuit B” is defined specifically by each manufacturer. Consult a repair manual dedicated to your vehicle for the exact location.

---

Severity of Code P022D

The severity is moderate, but this code should not be ignored. An uncorrected fault can lead to more serious problems, even costly engine damage. If you do not have the necessary skills, consult a professional quickly.

---

Possible Symptoms

Here are the common signs associated with code P022D:

• Decreased engine performance
• Entry into limp mode
• Misfires
• Increased fuel consumption

---

Common Causes

Typical causes of P022D include:

• Stuck bypass valve (open or closed)
• Obstruction in the valve movement
• Open circuit
• Damaged or broken wiring harness
• Faulty fuse or relay
• ECM failure
• Connector problem (corrosion, broken tab, etc.)

---

Diagnostic and Repair Steps

Recommended Tools:

• OBD-II scanner
• Multimeter
• Socket set, screwdrivers, wrenches
• Connector lubricant and cleaner
• Rags and gloves
• Manufacturer’s service manual

---

Safety Tips

• Let the engine cool down
• Chock the wheels
• Wear personal protective equipment (PPE)
• Disconnect the battery before any electrical work

---

Step-by-Step Troubleshooting Procedure

🛠 Step 1: Locating the Bypass Valve

Follow the charge pipes to the intercooler. The valve may be located:

• On the charge pipe
• Behind the bumper
• Under the hood (depending on the model)

Visually inspect for any physical damage.

---

🛠 Step 2: Removal and Inspection of the Valve

If possible, remove the valve to:

• Inspect for blockages or dirt
• Thoroughly clean the unit
• Reinstall and check if the code disappears

⚠️ Consult the manual before any removal.

---

🛠 Step 3: Inspection of the Wiring Harness

Inspect carefully:

• Wires exposed to the elements
• Cuts, nicks, corrosion
• Connectors and their locking mechanism

---

🛠 Step 4: Functional Test via Diagnostic Tool

With an advanced scan tool, test the valve by simulating:

• Full opening/closing
• Smooth movement without sticking

If the valve sticks or does not respond, consider replacing it.

---

🛠 Step 5: Basic Electrical Tests

• Disconnect the connectors at the valve and the ECM
• Check for continuity with a multimeter
• Test the ECM inputs to validate its response

---

Final Tip

Consult the manufacturer’s Technical Service Bulletins (TSBs). A known and documented solution can save you time and avoid complex diagnostics.

What Does It Mean?

This generic powertrain diagnostic trouble code (DTC) generally applies to all OBD-II equipped vehicles with a supercharger air cooler. This may include, but is not limited to, vehicles from Ford, Chevy, Mazda, Toyota, etc.

In forced induction systems, they use a supercharger air cooler or what I will call an intercooler (IC) to help cool the boosted air used by the engine. These operate similarly to a radiator.

In the case of the IC, instead of cooling antifreeze, it cools the air to produce a more efficient air/fuel mixture, which in turn leads to better fuel economy, improved performance, etc. The IC is part of the boost pressure side of the induction system. The bypass valve is used, as its name suggests, to let air bypass the intercooler to be vented to the atmosphere and/or recirculated. The Engine Control Module (ECM) uses it to adjust the valve based on current engine conditions and needs.

The ECM illuminates the Check Engine light with P022E and related codes when it monitors a condition outside a specific range in the intercooler bypass control circuit and/or system. This code can be triggered by a mechanical and/or electrical fault. If I had to guess here, I would lean towards a mechanical issue likely being the problem. That being said, either is possible.

P022E Supercharger Air Cooler Bypass Control “B” Circuit Low is set when the ECM detects an electrical value lower than desired in the “B” circuit. Refer to a manufacturer-specific repair manual to determine what the “B” circuit is in your particular application.
How severe is this DTC?

The severity in this case would be moderate. You don’t want to leave this issue unattended as it could evolve into something much more serious fairly quickly. Keep in mind that problems do not improve over time unless corrected. Engine damage is expensive, almost every time, so if you have exhausted your abilities, take the vehicle to a reputable repair center.
What are some of the symptoms of the code?

Symptoms of a P022E engine code may include:

Poor engine performance
Vehicle entering “limp mode”
Engine misfire
Poor fuel economy

What are some of the common causes of the code?

Causes

of this code may include:

Bypass valve stuck open/closed
Obstruction in the operational movement range of the bypass valve
Broken or damaged wiring harness
Faulty fuse/relay
ECM problem
Pin/connector issue. (e.g., corrosion, broken locking tab, etc.)

What are the P022E troubleshooting steps?

Be sure to check Technical Service Bulletins (TSBs) for your vehicle. Access to a known fix can save you time and money during diagnosis.
Tools

When working on the forced induction system, you may need:

OBD code reader
Pliers for hose clamps
Lubricant
Multimeter
Basic socket set
Ratchet and wrench sets
Basic screwdriver set
Rags/shop towels
Battery terminal cleaner
Service manual

Safety Tips

Let the engine cool down
Chock the wheels
Wear PPE (Personal Protective Equipment)

NOTE: ALWAYS check and record your battery and charging system integrity before proceeding with troubleshooting.
Basic Step #1

Locate your supercharger air cooler bypass control valve by following the charge piping going to your intercooler (IC); it may be mounted directly on the charge pipe. Depending on your specific make and model, you might find your IC mounted in your front bumper, front fenders, or perhaps directly under the hood among many other possible locations. Once the valve is located, inspect for any obvious physical damage.

NOTE: Ensure the engine is off.
Basic Step #2

It may be straightforward to remove the valve completely from the vehicle to check its functionality. Especially recommended if P024B code is active. Once removed, inspect for any obstruction in the valve’s range of motion. If possible, clean the valve before reinstalling it.

NOTE: Always refer to the service manual first, as this may not be possible or recommended on your specific vehicle.
Basic Tip #3

The bypass valve harness may be routed through areas exposed to the elements. These areas should be closely inspected for nicks, cuts, signs of corrosion, etc., in the wires involved in the circuit.

NOTE: Ensure the battery is disconnected before performing any electrical repairs.
Basic Step #4

Depending on your scan tool, you can check the valve’s functionality by commanding it and observing its range of motion. If accessible, you can disconnect one end of the valve to see the moving parts. Using your scan tool, fully open and close the valve while observing the mechanical operation of the valve itself. If you notice the valve sticking and nothing is obstructing it, the valve is likely faulty. In this case, you can try replacing it. Ensure the manufacturer also recommends a new valve in this scenario. Refer to the manual.
Basic Step #5

You will want to rule out any electrical issues in the involved harness. To do this, you may need to disconnect it at both the valve and the ECM. Using your multimeter, check the circuit’s integrity by performing many basic electrical tests (i.e., continuity). If everything checks out, there may be input tests you could perform involving testing the connector at the valve to verify ECM functionality with the valve.

What does it mean?

This generic powertrain diagnostic trouble code (DTC) generally applies to all OBD-II equipped vehicles with a supercharger air cooler. This may include, but is not limited to, vehicles from Ford, Chevy, Mazda, Toyota, etc.

In forced induction systems, they use a supercharger air cooler or what I will call an intercooler (IC) to help cool the boosted air used by the engine. These operate similarly to a radiator.

In the case of the intercooler, instead of cooling antifreeze, it cools the air to produce a more efficient air/fuel mixture, which in turn leads to better fuel economy, improved performance, etc. The intercooler is part of the boost pressure side of the induction system. The bypass valve is used, as its name suggests, to let air bypass the intercooler to be vented to the atmosphere and/or recirculated. The Engine Control Module (ECM) uses it to adjust the valve based on current engine conditions and needs.

The ECM illuminates the check engine light with P022F and related codes when it monitors a condition outside a specific range in the intercooler bypass control circuit and/or system. This code can be triggered by a mechanical and/or electrical fault. If I had to guess here, I would lean towards a mechanical issue likely being the problem. That being said, either is possible.

P022F Supercharger Air Cooler Bypass Control Circuit B is set when the ECM detects an electrical value higher than the desired value in the “B” circuit. Refer to a manufacturer-specific repair manual to determine what the “B” circuit is in your particular application.
How severe is this DTC?

The severity in this case would be moderate. You don’t want to leave this issue unattended as it could evolve into something much more serious quite quickly. Keep in mind that problems do not improve over time unless corrected. Engine damage is expensive, almost every time, so if you have exhausted your abilities, take the vehicle to a reputable repair center.
What are some of the symptoms of the code?

Symptoms of a P022F engine code may include:

Poor engine performance
Vehicle entering “limp mode”
Engine misfire
Poor fuel economy

What are some of the common causes of the code?

Causes

of this code may include:

Bypass valve stuck open/closed
Obstruction in the operational movement range of the bypass valve
Broken or damaged wiring harness
Faulty fuse/relay
ECM problem
Pin/connector issue. (e.g., corrosion, broken locking tab, etc.)

What are the troubleshooting steps for P022F?

Be sure to check the Technical Service Bulletins (TSBs) for your vehicle. Access to a known fix can save you time and money during diagnosis.
Tools

When working on the forced induction system, you may need:

OBD code reader
Pliers for hose clamps
Lubricant
Multimeter
Basic socket set
Ratchet and wrench sets
Basic screwdriver set
Rags/shop towels
Battery terminal cleaner
Service manual

Safety Tips

Let the engine cool down
Chock the wheels
Wear PPE (Personal Protective Equipment)

NOTE: ALWAYS check and record the integrity of your battery and charging system before proceeding with troubleshooting.
Basic Step #1

Locate your supercharger air cooler bypass control valve by following the charge piping going to your intercooler (IC); it may be mounted directly on the charge pipe. Depending on your specific make and model, you might find your IC mounted in your front bumper, front fenders, or perhaps directly under the hood among many other possible locations. Once the valve is located, inspect for any obvious physical damage.

NOTE: Ensure the engine is off.
Basic Step #2

It may be straightforward to remove the valve completely from the vehicle to check its functionality. Particularly recommended if code P024B is active. Once removed, inspect for any obstruction in the valve’s range of movement. If possible, clean the valve before reinstalling it.

NOTE: Always refer to the service manual first, as this may not be possible or recommended on your specific vehicle.
Basic Tip #3

The bypass valve harness may be routed through areas exposed to the elements. These areas should be closely inspected for nicks, cuts, signs of corrosion, etc., in the wires involved in the circuit.

NOTE: Ensure the battery is disconnected before performing any electrical repairs.
Basic Step #4

Depending on your scan tool, you can check the valve’s functionality by commanding it and observing its range of movement. If accessible, you can disconnect one end of the valve to see the moving parts. Using your scan tool, fully open and close the valve while observing the mechanical operation of the valve itself. If you notice the valve sticking and nothing is obstructing it, the valve is likely faulty. In this case, you can try replacing it. Ensure the manufacturer also recommends a new valve in this scenario. Refer to the manual.
Basic Step #5

You will want to rule out any electrical issues in the involved harness. To do this, you may need to disconnect it at both the valve and the ECM. Using your multimeter, check the circuit’s integrity by performing many basic electrical tests (e.g., continuity). If everything checks out, there may be input tests you could perform involving testing the connector at the valve to verify ECM functionality with the valve.