P212C – Low Input of Throttle Position Sensor G Circuit

Symptoms

Symptoms may include:

Irregular or low idle
Stalling
Surging
No/little acceleration
Other symptoms may also be present

Causes

A P212C code may mean that one or more of the following events have occurred:

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

Possible Solutions

Here are some recommended troubleshooting and repair steps:

Carefully check the throttle position sensor (TPS), wiring connector, and wiring for breaks, etc. Repair or replace if necessary
Check voltage at 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 proper TPS alignment or adjustment, 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 this is the case, you should definitely check wiring to ensure it’s not rubbing against anything, grounding, etc. The code may return.

P212D – High Input from Throttle/Pedal Position Sensor/Switch G Circuit

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 P212D code may include:

Throttle stuck (at any RPM)
Limited or no acceleration
Engine stalling at idle
Hesitation during acceleration
Cruise control inoperative

Causes

Possible causes of this engine code include:

Open or shorted circuits between the 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 to check the technical service bulletins (TSB) for your specific vehicle. Your issue might be a known problem with a published manufacturer fix that could save you time and money during diagnosis.

I would need access to a diagnostic scanner, digital volt/ohmmeter (DVOM) and vehicle information source like All Data (DIY) to diagnose a P212D code.

I would make the first step of my diagnosis a visual inspection of all cables and connectors related to the system. I also like to check the throttle plate for signs of carbon buildup or damage. Excessive carbon buildup, which keeps the throttle body open at startup, can cause a P212D code to be stored. Clean carbon from the throttle body according to manufacturer recommendations and repair or replace any faulty wiring or 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 down in case I need the order in which codes were stored. I also like to save all related freeze frame data. These notes can prove helpful if P212D proves to be intermittent. Now I clear the codes and test drive the vehicle. If the code resets, I continue my diagnosis

Voltage spikes and inconsistencies between the 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 and/or inconsistencies are detected, use the DVOM to retrieve live data from each sensor individually. To retrieve live data with the DVOM, connect test leads to appropriate signal and ground circuits and observe the DVOM display while operating the DBW. Look for voltage spikes when the throttle is slowly operated from closed position to wide open throttle. 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 the throttle body, throttle actuator motor and all throttle position sensors to be replaced together

P212E Throttle Position Sensor / Switch G Circuit Intermittent

Severity and Symptoms

The TPS plays a crucial role in engine operation, therefore, a stored P212E code should be addressed with a certain degree of urgency.

Symptoms of a P212E code may include:

Hesitation during acceleration
Black smoke from the engine exhaust (especially at startup)
Delayed engine starting (particularly during cold starts)
Reduced fuel efficiency
Stored emission-related codes may accompany a P212E

Causes

Possible causes of this engine code include:

Faulty or improperly adjusted TPS
Open or shorted TPS “G” wires or connectors
Binding or damaged throttle plate
Incorrect PCM or PCM programming error

Diagnostic and Repair Procedures

A good starting point is always to check the Technical Service Bulletins (TSBs) for your specific vehicle. Your issue might be a known problem with a published fix from the manufacturer, which can save time and money during diagnosis.

I typically use a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information (such as ALL DATA DIY) to diagnose a P212E code.

Successful diagnosis usually begins with a visual inspection of all cables and connectors related to the system. I also like to test the throttle plate for signs of coking or carbon damage. Repair or replace any faulty wiring or components as needed, then recheck the throttle body and TPS.

Connect the scanner to the diagnostic connector; retrieve all stored fault codes and note them for future reference. I also save any associated freeze frame data. My notes often prove useful if the stored code turns out to be intermittent. Next, I would clear the codes and test the vehicle. Continue diagnostics if the code resets. If it does not reset, the condition might need to worsen before a proper diagnosis can be made. Drive the vehicle normally until the PCM enters readiness mode or the code resets.

Proceed by checking the Technical Service Bulletins (TSBs) relevant to the specific malfunction (and vehicle) in question by consulting your vehicle information source. If applicable, use the information in the appropriate TSB to assist in your diagnosis. TSBs can be particularly helpful when diagnosing intermittent conditions.

The scanner data stream can provide useful information regarding faults and inconsistencies in the throttle position sensor. If you filter the scanner data stream to display only relevant data, you will get a more accurate response from the data.

If no issues are detected, use the DVOM to test the TPS. Using the DVOM gives you access to live data if the appropriate test leads are connected to the ground and signal circuits. Watch the DVOM screen while manually operating the throttle. Look for voltage spikes when the throttle is slowly moved from the closed position to wide open throttle. Voltage typically ranges from 0.5 volts at closed throttle to 4.5 volts at open throttle. If faults or other inconsistencies are detected, suspect that the tested sensor is faulty or improperly adjusted.

Additional Diagnostic Notes:

If the TPS has been replaced and a P212E continues to be stored, consult the vehicle information source for TPS adjustment specifications.
Use the DVOM (with test leads connected to the ground and signal circuits) to accurately adjust the TPS

P2130 Throttle/Pedal Position Sensor/Switch B Circuit Malfunction

Symptoms

Potential symptoms include:

MIL (Malfunction Indicator Lamp) illumination
Misfires at idle or highway speed
Poor idle quality
May not idle
May start and stall

Causes

Potential causes of P2130 code include:

Sticking throttle return spring
Corrosion of MAP or TPS connectors
Misrouted harness causing chafing
Faulty TPS
Faulty PCM

Possible Solutions

If you have access to a scan tool, with KOEO (Key On Engine Off), monitor TPS voltage. With the throttle closed, voltage should be approximately 0.45 volts. It should gradually sweep up to about 4.5 to 5 volts as you press the accelerator. Sometimes only an oscilloscope can capture an intermittent problem in TPS signal voltage. If you notice an issue in the TPS sweep voltage, replace the TPS.

NOTE: Some TPS sensors require fine adjustment. If you’re not comfortable using a DVOM (Digital Volt Ohm Meter) to adjust the new TPS, then it’s best to take the vehicle to a shop. If the voltage is not 0.45 volts (+ or – about 0.3 volts) with the throttle closed or if the reading is “stuck,” disconnect the TPS connector. With KOEO, check for 5 volt reference voltage present at the connector and a good ground. You can check signal circuit continuity by jumpering a fuse wire between the TPS connector ground circuit and the signal circuit. If the TPS reading on the scan tool now shows zero, replace the TPS. However, if it doesn’t change the reading to zero, check for an open or short in the signal wire and if none is found, suspect a faulty PCM. If manipulating the TPS cable harness causes a change at rest, suspect a faulty TPS.

P2131 Throttle Position Sensor F Circuit Range / Performance

Symptoms

Potential

Symptoms of a P2131 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
Black smoke puff during acceleration
No start condition

Causes

A P2131 code may indicate that one or more of the following events has occurred:

TPS has intermittent open or short internally
Harness rubbing causing open or short in wiring
Poor connection at TPS
Faulty PCM (less likely)
Water or corrosion in connector or sensor

Possible Solutions

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

2. Look for 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 sample many different readings over one or two data lines and may miss an intermittent interruption. Connect your oscilloscope and observe the signal. It should sweep up and down smoothly without jerks or spikes.

3. If no issues were 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 present, check if the ground circuit is open or shorted.

5. Ensure the signal circuit is not at 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.

P2132 Throttle Position Sensor F Circuit Low Input

Symptoms

Symptoms may include:

Irregular or low idle
Stalling
Surging
No/little acceleration
Other symptoms may also be present

Causes

A P2132 code may mean one or more of the following has occurred:

TPS not securely mounted
Short circuit in TPS wiring 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 if necessary
Check voltage at TPS (refer to your vehicle’s service manual for specific information). If voltage is too low, it indicates a problem. Replace if necessary.

P2133 Throttle/Pedal Position Sensor/Switch F Circuit High Input

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 P2133 code may include:

Stuck accelerator (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 the 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 to check the technical service bulletins (TSB) for your specific vehicle. Your problem may be a known issue with a known fix published by the manufacturer and can save you time and money during diagnosis.

I would need access to a diagnostic scanner, a digital volt/ohmmeter (DVOM) and a vehicle information source like All Data (DIY) to diagnose a P2133 code.

I would make the first step of my diagnosis a visual inspection of all cables and connectors related to the system. I also like to check the throttle plate for signs of carbon buildup or damage. Excessive carbon buildup, which keeps the throttle body open at startup, can lead to the storage of a P2133 code. Clean carbon from the throttle body according to manufacturer recommendations and repair or replace faulty wiring or components as needed, then retest the DBW system.

Next, I connect the scanner to the vehicle’s diagnostic port and retrieve all stored fault codes. I note them down in case I need the order in which the codes were stored. I also like to keep all related freeze frame data. These notes may prove useful if P2133 proves to be intermittent. Now I clear the codes and test the vehicle. If the code resets, I continue my diagnosis

Voltage spikes and inconsistencies between the TPS, PPS and PCM can be detected using the scanner’s data stream. Refine the data stream to display only relevant data for faster response. If no spikes and/or inconsistencies are detected, use the DVOM to retrieve live data from each of the sensors individually. To retrieve live data with the DVOM, connect the test leads to the appropriate signal and ground circuits and observe the DVOM display while using the DBW. Look for voltage spikes when the accelerator is slowly operated from closed position to wide open throttle. 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 the throttle body, throttle actuator motor and all throttle position sensors to be replaced together

P2134 Throttle Position Sensor / Switch F, Intermittent Circuit

Severity and Symptoms

The TPS plays an important role in engine operation, therefore, a stored P2134 code should be treated with a certain degree of urgency.

Symptoms of a P2134 code may include:

Hesitation during acceleration
Black smoke from engine exhaust (particularly at startup)
Delayed engine starting (especially during cold starts)
Reduced fuel efficiency
Stored emission-related codes may accompany a P2134

Causes

Possible causes of this engine code include:

Faulty or improperly adjusted TPS
Open or shorted TPS “F” wires or connectors
Binding or damaged throttle plate
Incorrect PCM or PCM programming error

Diagnostic and Repair Procedures

I typically use a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information (such as ALLDATA DIY) to diagnose a P2134 code.

Connect the scanner to the diagnostic connector; retrieve all stored fault codes and note them for future reference. I also save all associated freeze frame data. My notes are often helpful if the stored code proves to be intermittent. Then, I would clear the codes and test the vehicle. Continue diagnosis if the code resets. If it doesn’t reset, the condition might need to worsen before a proper diagnosis can be made. Drive the vehicle normally until the PCM enters readiness mode or the code resets.

Proceed by checking the Technical Service Bulletins (TSBs) that apply to the specific malfunction (and vehicle) in question by consulting your vehicle information source. If applicable, use the information in the appropriate TSB to assist in your diagnosis. TSBs can be particularly helpful when diagnosing an intermittent condition.

If no issues are detected, use the DVOM to test the TPS. Using the DVOM gives you access to live data if the appropriate test leads are connected to the ground and signal circuits. Watch the DVOM screen while manually operating the throttle. Look for voltage spikes when the throttle is slowly operated from the closed position to wide open throttle. Voltage typically ranges from 0.5 volts at closed throttle to 4.5 volts at open throttle. If faults or other inconsistencies are detected, suspect that the tested sensor is faulty or improperly adjusted.

Additional Diagnostic Notes:

If the TPS has been replaced and a P2134 continues to be stored, consult the vehicle information source for TPS adjustment specifications.
Use the DVOM (with test leads connected to the ground and signal circuits) to accurately adjust the TPS

P2135 TPS Voltage Correlation DTC

📌 What does code P2135 mean?

Code P2135 is an OBD-II code that indicates a disagreement between the two throttle position sensors (TPS) in the electronic throttle body. These sensors should return consistent values. If the ECU detects a persistent difference, it triggers this error code to warn of a potential malfunction in the acceleration system.

⚠️ Severity of the code

High. This code can cause stalling, a sudden loss of power, or a stuck accelerator, which can pose a driving hazard. It is strongly advised not to ignore this code.

🚨 Common symptoms:

Stalling when stopping
No or very little response to acceleration
Sudden loss of power while driving
Engine RPM stuck
Check Engine light on

🔍 Common causes of P2135:

Corroded, poorly connected, or damaged connector (“pigtail”) at the throttle body
Short to ground in the TPS sensor wiring
Deformed upper cover of the throttle body, disrupting internal gears
Faulty electronic throttle body
Faulty accelerator pedal sensor
Engine control unit (ECU/PCM) problem
Uncorrelated TPS: the ECU may require a relearning phase or reprogramming

🧰 Diagnostic and repair steps:

1. 📄 Search for TSBs (Technical Service Bulletins)

These bulletins may document known cases for your model and provide manufacturer-approved solutions.

2. 🧪 Sensor relearn

Some vehicles require a TPS sensor reset procedure. Example for a Nissan:

Ignition: ON position (engine off)
Press and release the pedal 5 times within 5 seconds
Wait 7 seconds, then press and hold for 10 seconds (light flashes)
Release, wait 10 seconds, then press again for 10 seconds
Turn off the ignition

⚠️ Procedure varies by brand: check your technical manual.

3. 🔌 Inspection of the throttle body connector

Disconnect the connector, check the condition of the pins (bent, corroded, pushed in)
Clean with a small screwdriver and apply dielectric grease
If damaged, replace the pigtail connector (available at auto parts stores)

4. 🔎 Check of the throttle body upper cover

Check for absence of cracks or deformation
This fragile cover houses the throttle gears
If damaged, replace the throttle body (or the cover if sold separately)

5. 🔧 Test of the accelerator pedal sensor

Using a voltmeter:
- 5V reference and variable signal from 0.5V to 5V
- Slowly press the pedal: the voltage should rise linearly
- If voltage jumps or no signal: faulty sensor

6. ⚡ Check of the throttle body motor power supply

Identify the terminals (via manufacturer diagram)
Test for current with pedal pressed and ignition ON
No current = faulty ECU, current present but no movement = faulty throttle body

7. 🧩 Address other related codes

If codes like P2136 are present, address them first: they may be the underlying cause of P2135.

🛠️ Common repairs:

Cleaning or replacement of the TPS pigtail connector
TPS relearn or ECU reprogramming
Replacement of the accelerator pedal sensor
Replacement of the electronic throttle body
Repair of the TPS wiring harness
Replacement of the engine control unit (if confirmed faulty)

❌ Common mistakes to avoid:

Do not directly replace the throttle body without checking the wiring and connector, as this is one of the most common causes.
Do not neglect reprogramming or relearning after repair: it may be essential to fix the problem.

P2136 Accelerator Pedal Position Sensor Voltage Correlation DTC

Symptoms

Symptoms of a P2136 code can range from stalling when you stop, to a complete lack of power, to no acceleration, to sudden power loss at cruising speeds, or to the throttle being stuck at the current RPM. Additionally, the check engine light will illuminate and the code will be set.

Potential Causes of P2136 DTC

From my experience, the wiring connector or “pigtail” on the throttle body causes issues in the form of a poor connection. The female terminals on the pigtail corrode or retract from the connector.

Possible bare wire on a pigtail shorting to ground.
The upper cover of the throttle body is deformed, preventing the gears from turning correctly.
The electronic throttle body is defective.
The accelerator pedal sensor or its wiring has failed.
The engine management computer has failed.

The TPS sensors did not correlate for a few seconds and the computer needs to go through its relearn phase to restore active throttle body response, or the computer needs to be reprogrammed at the dealership.

Diagnostic Steps / Repair

A few points about the electronic throttle control. This system is incredibly sensitive and vulnerable to damage, more than any other system. Handle it and its components with extreme care. A drop or rough handling and it’s history.

Apart from the accelerator pedal sensor, the rest of the components are located in the throttle body. During inspection, you will notice a flat plastic cover on top of the throttle body. This houses the gears to operate the throttle plate. The motor has a small metal gear that protrudes through the housing under the cover. It drives a large “plastic” gear attached to the throttle plate.

The pin that centers and supports the gear fits into the throttle body housing and the upper pin fits into the “thin” plastic cover. If the cover is deformed in any way, the speed will be compromised requiring the entire throttle body to be replaced.

The first thing to do is go online and get the TSBs (Technical Service Bulletins) for your vehicle regarding the code. These TSBs result from customer complaints or recognized issues and the factory-recommended repair procedure.
Check online or in a service manual for a possible relearn procedure to reset the computer. For example, on a Nissan, turn the ignition on and wait 3 seconds. Within the next 5 seconds, press and release the pedal 5 times. Wait 7 seconds, press and hold the pedal for 10 seconds. When the check engine light starts flashing, release the pedal. Wait 10 seconds and press the pedal again for 10 seconds and release. Turn off the ignition.
Pull the electrical connector off the throttle body. Inspect it carefully for missing or bent female terminals. Look for corrosion. Clean any corrosion using a small pocket screwdriver. Place a small amount of electrical grease on the terminals and reconnect it.
If the terminal connector has twisted or missing pins, you can buy a new “pigtail” at most auto parts stores or from the dealership.
Inspect the upper cover on the throttle body for cracks or deformation. If there are any, call the dealer and ask if they sell only the upper cover. Otherwise, replace the throttle body.
Using a voltmeter, probe the accelerator pedal sensor. It will have 5 volts for reference and next to it a variable signal. Turn the key and slowly press the pedal. The voltage should climb smoothly from 0.5 to 5.0. Replace it if the voltage jumps or if there is no voltage on the signal wire.
Look online for the cable terminal identification on your vehicle’s throttle body. Probe the throttle body connector to power the throttle motor. Have an assistant turn the key on and lightly press the pedal. If no power is present, the computer has failed. If there is power, the throttle body is malfunctioning.