P2100 – Open Throttle Actuator Control Motor Circuit

Code P2100 – Severity, Symptoms, and Repairs

1. Severity of Code P2100

Code P2100 is generally severe due to its direct impact on the Electronic Throttle Control (ETC) system. It is often an electrical issue preventing the Powertrain Control Module (PCM) from fully compensating for the failure.

An engine affected by this code may:
🔧 Have a fixed idle speed (typically between 1000 and 1200 RPM)
🔧 No longer respond to the accelerator, limiting driving

2. Symptoms of Code P2100

Signs indicating a problem with the throttle actuator include:
✅ Malfunction indicator light illuminated (Check Engine)
✅ Engine speed frozen (unable to adjust idle)
✅ No response to acceleration (pedal ineffective)

3. Possible Causes of Code P2100

Common failures that can trigger this code are:
✔️ Open circuit in the throttle actuator – most likely
✔️ Faulty throttle actuator – internal electrical failure
✔️ Defective PCM – unlikely but possible

4. Diagnostic and Repair Procedures

🔍 Step 1: Checking Technical Service Bulletins (TSBs)

First, consult TSBs specific to your vehicle. It may be a known issue with a solution already published by the manufacturer.

🔍 Step 2: Inspecting Wiring and Connectors

📌 Locate the Throttle Actuator A (TA-A). It is often situated:

At the front or top of the engine
Inside the wheel wells
Against the firewall

✔️ Inspect cables and connectors to detect:

Exposed, burnt, or chafed wires
Corroded or melted connections
✔️ Clean terminals with electrical contact cleaner and apply electrical grease.

🔍 Step 3: Clearing Codes and Testing

📌 Clear codes with an OBD2 scanner and restart the engine:

If the code does not return, the problem was likely a poor connection.
If the code returns, continue diagnostics.

🔍 Step 4: Testing the Throttle Actuator

✔️ Disconnect the wiring harness from the throttle actuator.
✔️ With a digital multimeter (DVOM), measure the resistance between the actuator terminals:

A reading of infinity or 0 ohms indicates an open or short circuit → replace the actuator.
Check your vehicle’s resistance specifications to confirm the correct value.

🔍 Step 5: Checking Electrical Power Supply

✔️ With a DVOM, verify that the throttle actuator receives 12V:

Red wire to the actuator power supply
Black wire to ground
✔️ Activate the actuator with an OBD2 diagnostic tool:
No 12V? Repair wiring or check the relay.
12V present but no reaction? The actuator is likely faulty.

🔍 Step 6: Checking Ground

✔️ Use a test light connected to +12V:

Touch the actuator’s ground circuit
If the light does not illuminate → poor ground connection
If the light flickers when shaking the harness → intermittent connection

5. Conclusion

Code P2100 is serious and can prevent the engine from responding to acceleration. The problem is usually electrical and related to the throttle actuator or its circuit.

🚗 If you have checked all tests and the code persists, the actuator is likely defective. A faulty PCM is rare, but if the problem continues after replacing the actuator, PCM reprogramming may be necessary.

⚠️ If you are unsure of the diagnosis, consult a qualified professional.

P2101 – Throttle Actuator A Control Motor Circuit Range Performance

Code Severity and Symptoms

The severity is generally severe due to its impact on the cooling system. Since it could be an electrical or mechanical failure, the PCM cannot fully compensate for it. Partial compensation usually means the engine has a fixed idle speed (typically around 1000 – 1200 RPM).

Symptoms of a P2101 engine code may include:

Malfunction indicator light illuminated
Fixed idle speed
Unable to accelerate the engine

Causes

Typically, the causes for this code to set are as follows:

Open or short circuit in the throttle actuator circuit – likely
Faulty throttle actuator – inoperative (mechanically or electrically) – probable
Failed PCM – unlikely

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 and could save you time and money during diagnosis.

Next, locate the Throttle Actuator A (TA-A) on your specific vehicle. This actuator is typically mounted on the front of the engine, on top of the engine, inside the wheel wells, or against the firewall. Once located, visually inspect the connector and wiring. Look for scratches, rubbing, exposed wires, burns, or melted plastic. Disconnect the connector and carefully inspect the terminals (the metal parts) inside the connector. Check if they appear burnt or have a greenish tint indicating corrosion. Use electrical contact cleaner and a plastic-bristled brush if terminal cleaning is needed. Let it dry and apply electrical grease where the terminals make contact.

If you have a scan tool, clear the diagnostic codes from memory and see if the P2101 code returns. If it does not, the connections were likely your issue.

For this particular code, this is the most common area of concern, along with relays/connections to relays, with actuator failure being a close second.

If the code returns, we will need to test the actuator and related circuits. Typically, each throttle actuator has 2 wires. First, disconnect the wiring harness going to the throttle actuator. With a digital volt-ohm meter (DVOM), connect one meter lead to one terminal of the actuator. Connect the remaining meter lead to the other terminal of the actuator. It should not be open or shorted. Check the resistance specifications for your specific vehicle. If the actuator motor is open or shorted (infinite resistance or no resistance/0 ohms), replace the throttle actuator.

If this test passes, with a DVOM, verify that you have 12V at the throttle actuator power circuit (red lead to the actuator power circuit, black lead to a good ground). With a scan tool that can activate the throttle actuator, turn on the throttle actuator. If there is no 12 volts at the actuator, repair the wiring from the PCM or relay to the actuator, or possibly a faulty PCM.

If that checks out, ensure you have a good ground at the throttle actuator. Connect a test light to the positive 12V battery (red terminal) and touch the other end of the test light to the ground circuit going to the throttle actuator circuit ground. Using the scan tool to actuate the throttle actuator, check if the test light illuminates each time the scan tool actuates the actuator. If the test light does not illuminate, it would indicate a circuit problem. If it lights up, wiggle the wiring harness going to the actuator to see if the test light flickers, indicating an intermittent connection.

If all previous tests have passed and you continue to get a P2101, it would most likely indicate a faulty throttle actuator, although a defective PCM cannot be ruled out until the throttle actuator has been replaced. If in doubt, seek assistance from a qualified automotive diagnostician. PCMs need to be programmed or calibrated to the vehicle to be installed correctly.

P2102 – Low Value of Throttle Actuator A Control Motor Circuit

Code Severity and Symptoms

The severity is generally severe due to its impact on the cooling system. Since it’s typically an electrical failure, the PCM cannot fully compensate for it. Partial compensation usually means the engine has a fixed idle speed (generally around 1000 – 1200 RPM).

Symptoms of a P2102 engine code may include:

Malfunction indicator light illuminated
Fixed idle speed
Unable to accelerate the engine

Causes

Typically, the causes for this code to set are as follows:

Open or short circuit in the throttle actuator circuit – likely
Failed throttle actuator – likely
Failed PCM – unlikely

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 known fix published by the manufacturer and could save you time and money during diagnosis.

Next, locate the Throttle Actuator A (TA-A) on your specific vehicle. This actuator is typically found mounted on the front of the engine, on top of the engine, inside the wheel wells, or against the firewall. Once located, visually inspect the connector and wiring. Look for chafing, rubbing, bare wires, burns, or melted plastic. Disconnect the connector and carefully inspect the terminals (the metal parts) inside the connector. See if they appear burnt or have a greenish tint indicating corrosion. Use electrical contact cleaner and a plastic bristle brush if cleaning the terminals is necessary. Let it dry and apply electrical grease where the terminals make contact.

If you have a scan tool, clear the diagnostic codes from the memory and see if the P2102 code returns. If it does not, the connections were likely your problem.

For this code, this is the most common area of concern, just like relay/connections to relays, with actuator failure being a close second.

If that checks out, ensure you have a good ground at the throttle actuator. Connect a test light to the positive 12V battery (red terminal) and touch the other end of the test light to the ground circuit going to the throttle actuator circuit ground. Using the scan tool to actuate the throttle actuator, check if the test light illuminates each time the scan tool actuates the actuator. If the test light does not illuminate, it would indicate a circuit problem. If it does illuminate, wiggle the wiring harness going to the actuator to see if the test light flickers, indicating an intermittent connection.

If all previous tests have passed and you continue to get a P2102, it would most likely indicate a failing throttle actuator, although a faulty PCM cannot be ruled out until the throttle actuator has been replaced. If in doubt, seek assistance from a qualified automotive diagnostician. PCMs need to be programmed or calibrated to the vehicle to be installed correctly.

P2103 – High Throttle Actuator Control Motor Circuit

Code Severity and Symptoms

The severity is generally severe due to its impact on the cooling system. Since it is typically an electrical failure, the PCM cannot fully compensate for it. Partial compensation usually means the engine has a fixed idle speed (generally around 1000 – 1200 RPM).

Symptoms of a P2103 engine code may include:

Malfunction indicator light illuminated
Fixed idle speed
Unable to accelerate the engine

Causes

Typically, the causes for this code to set are as follows:

Open in the throttle actuator circuit – likely
Failed throttle actuator – probable
Failed PCM – unlikely

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 known fix released by the manufacturer and could save you time and money during diagnosis.

Next, locate the Throttle Actuator A (TA-A) on your specific vehicle. This actuator is usually mounted on the front of the engine, on top of the engine, inside the wheel wells, or against the firewall. Once located, visually inspect the connector and wiring. Look for scratches, rubbing, bare wires, burns, or melted plastic. Disconnect the connector and carefully inspect the terminals (the metal parts) inside the connector. Check if they appear burnt or have a greenish tint indicating corrosion. Use electrical contact cleaner and a plastic-bristled brush if terminal cleaning is needed. Let it dry and apply electrical grease where the terminals make contact.

If you have a scan tool, clear the diagnostic codes from memory and see if the P2103 code returns. If not, the connections were likely your issue.

For this code, this is the most common area of concern, as are relay/connections to relays, with actuator failure being a close second.

If this test passes, use a DVOM to verify you have 12V at the throttle actuator power circuit (red lead to the actuator power circuit, black lead to a good ground). With a scan tool that can activate the throttle actuator, turn on the throttle actuator. If there is no 12 volts at the actuator, repair the wiring from the PCM or relay to the actuator, or possibly a faulty PCM.

If all previous tests have passed and you continue to get a P2103, it would most likely indicate a failing throttle actuator, although a faulty PCM cannot be ruled out until the throttle actuator has been replaced. If in doubt, seek assistance from a qualified automotive diagnostician. PCMs need to be programmed or calibrated to the vehicle to be installed correctly.

P2104 Throttle Actuator Control System – Forced Idle

Code Severity and Symptoms

The severity of this code can range from moderate to severe depending on the specific malfunction. Symptoms of a P2104 trouble code may include:

Engine does not start
Little or no throttle response
Check engine light illuminated
ABS light illuminated
Automatic transmission won’t shift
Additional codes present

Common Causes of This DTC Code

The most common situations that set this code and put the engine in fail-safe or limp mode to indicate a problem and act as a red flag are:

Engine overheating
Coolant leaks
EGR valve malfunction
Mass airflow sensor malfunction
Engine axle modifications
ABS, traction control, or stability control failures
Automatic transmission problems
Abnormal system voltages

What Are Common Repairs?

Repair coolant leak
Replace or clean ABS sensor
Replace or clean EGR valve
Replace or clean mass airflow sensor
Clean connector corrosion
Repair or replace wiring
Replacing PCM

Diagnostic and Repair Procedures

The first step in troubleshooting any malfunction is to search for Technical Service Bulletins (TSBs) for the specific vehicle by year, model, and powertrain. In some circumstances, this can save you considerable time in the long run by pointing you in the right direction.

The second step for this code is to perform a PCM scan to identify other trouble codes. This code is an informational code and in most cases its function is to alert a driver that the PCM has initiated a fail-safe mode due to a malfunction or failure in a system not directly related to the throttle actuator control.

If other codes are identified, you should check TSBs related to the specific vehicle and that code. If a TSB hasn’t been issued, you should follow the specific troubleshooting steps for that code to identify the source of the malfunction detected by the PCM that caused the engine to enter fail-safe or limp mode.

Once all other codes have been cleared or if no other codes are detected, if the throttle actuator control code still exists, the PCM and throttle actuator must be evaluated. All wiring and connections should be visually inspected for obvious defects as a starting point.

Common Mistake

Replacing the throttle actuator or PCM when other malfunctions are setting this code.

Rare Repair

Replacing the throttle actuator control

I hope the information in this article has been helpful in pointing you in the right direction to fix the issue with your throttle actuator control system force code. This article is strictly informational and specific vehicle technical data and service bulletins should always take priority.

P2105 Throttle Actuator Control System – Forced Engine Shutdown

Code Severity and Symptoms

The severity of this code can range from moderate to severe depending on the specific malfunction. Symptoms of a P2105 trouble code may include:

Engine does not start
Little or no throttle response
Check engine light illuminated
ABS light illuminated
Automatic transmission won’t shift
Additional codes present

Common Causes of This DTC Code

The most common situations that set this code and put the engine in fail-safe or limp mode to indicate a problem and act as a red flag are:

Engine overheating
Coolant leaks
EGR valve malfunction
Mass airflow sensor malfunction
Engine axle modifications
ABS, traction control, or stability control failures
Automatic transmission issues
Abnormal system voltages

What Are Common Repairs?

Repair coolant leak
Replace or clean ABS sensor
Replace or clean EGR valve
Replace or clean mass airflow sensor
Clean connector corrosion
Repair or replace wiring
Flashing or replacing PCM

Diagnostic and Repair Procedures

The first step in troubleshooting any malfunction is to search for Technical Service Bulletins (TSBs) for the specific vehicle by year, model, and powertrain. In some circumstances, this can save significant time in the long run by pointing you in the right direction.

The second step for this code is to perform a PCM scan to identify other trouble codes. This code is an informational code and in most cases functions to alert the driver that the PCM has initiated a fail-safe mode due to a malfunction or failure in a system not directly related to the throttle actuator control.

If other codes are identified, you should check TSBs related to the specific vehicle and that code. If no TSB has been issued, you should follow the specific troubleshooting steps for that code to identify the source of the malfunction detected by the PCM that caused the engine to enter fail-safe or limp mode.

Once all other codes have been cleared or if no other codes are detected, if the throttle actuator control code still exists, the PCM and throttle actuator control must be evaluated. All wiring and connections should be visually inspected for obvious defects as a starting point.

Common Mistake

Replacing the throttle actuator control or PCM when other malfunctions are setting this code.

Rare Repair

Replacing the throttle actuator control assembly

I hope the information in this article has been helpful in guiding you in the right direction to fix the issue with your throttle actuator control system force code. This article is strictly informational and specific technical data and service bulletins for your vehicle should always take priority.

P2106 Throttle Actuator Control System – Forced Limited Power

Code Severity and Symptoms

The severity of this code can range from moderate to severe depending on the specific malfunction. Symptoms of a P2106 trouble code may include:

Engine does not start
Little or no throttle response
Check engine light illuminated
ABS light illuminated
Automatic transmission won’t shift
Additional codes present

Common Causes of This DTC Code

The most common situations that set this code and put the engine in fail-safe or limp mode to indicate a problem and act as a red flag are:

Engine overheating
Coolant leaks
EGR valve malfunction
Mass air flow sensor malfunction
Engine axle modifications
ABS, traction control, or stability control failures
Automatic transmission problems
Abnormal system voltages

What Are the Common Repairs?

Repair coolant leak
Replace or clean ABS sensor
Replace or clean EGR valve
Replace or clean mass air flow sensor
Clean connector corrosion
Repair or replace wiring
PCM replacement

Diagnostic and Repair Procedures

This is an important step, just as an example, some Ford vehicles from 2003 to 2005 are affected by a P2106 and/or other codes and the fix is to reprogram the PCM.

If other codes are identified, you should check TSBs related to the specific vehicle and that code. If a TSB has not been issued, you should follow the specific troubleshooting steps for that code to identify the source of the malfunction detected by the PCM that caused the engine to enter fail-safe or limp mode.

Common Mistake

Replacing the throttle actuator control or PCM when other malfunctions are setting this code.

Rare Repair

Replacing the throttle actuator control

I hope the information in this article has been helpful in pointing you in the right direction to correct the issue with your throttle actuator control system force code. This article is strictly informational and specific technical data and service bulletins for your vehicle should always take priority.

P2107 Throttle Actuator Control Module Processor

Code Severity and Symptoms

The severity of this code can range from moderate to severe depending on the specific malfunction. Symptoms of a P2107 fault code may include:

Engine does not start
Worsening poor performance
Little or no response from the accelerator
Engine warning light illuminated
Smoke from the exhaust pipe
Increased fuel consumption

Common Causes of P2107 Code

Causes

Possible causes of this code may include:

Faulty throttle body
Dirty throttle plate or linkage
Defective throttle position sensor
Faulty accelerator pedal position sensor
Throttle actuator control motor is defective
Corroded or damaged connector
Faulty or damaged wiring
Faulty PCM
Common repairs
Throttle body replacement
Cleaning throttle plate and linkage
Throttle position sensor replacement
Throttle actuator control motor replacement
Accelerator pedal position sensor replacement
Cleaning connector corrosion
Repairing or replacing wiring
PCM replacement

Diagnostic and Repair Procedures

Check TSBs
The first step in troubleshooting any malfunction is to search for Technical Service Bulletins (TSBs) for the specific vehicle by year, model, and powertrain. In some circumstances, this can save you significant time in the long run by pointing you in the right direction. This is particularly important if you own a Ford, as we are aware of a number of known issues with Ford and Lincoln models.

The second step is to locate all components associated with the electronic throttle control system. This will include the throttle body, throttle position sensor, throttle actuator control motor, PCM, and accelerator position sensor on a simplex system. Once these components are located, a thorough visual inspection should be performed to check that all related cables show no obvious defects such as scraping, rubbing, bare wires, burning, or melted plastic. Then, check each component’s connectors for security, corrosion, and damaged pins.

The final visual and physical inspection is the throttle plate. With ignition off, you should be able to rotate the throttle plate by pushing on it. It should rotate to wide open position. If there is sludge buildup behind the plate, it should be cleaned while accessible.

Advanced Steps

Advanced steps become very vehicle-specific and require appropriate advanced equipment to perform accurately. These procedures require a digital multimeter and vehicle-specific technical references. Voltage requirements will be highly dependent on the specific vehicle year, model, and engine.

Circuit Checks

With the ignition switch in the off position, disconnect the electrical connector from the throttle body. Locate the 2 pins that go to the motor(s) on the throttle body. Using a digital ohmmeter set to ohms, check the resistance of the motor(s). The motor should read approximately between 2 and 25 ohms depending on the specific vehicle (consult manufacturer specifications for your vehicle). If the resistance is too high or too low, the throttle body will need to be replaced. If all tests have passed up to this point, you’ll want to check the motor voltage signals.

If this process identifies missing power source or ground, continuity tests may be required to verify wiring integrity. Continuity tests should always be performed with power disconnected from the circuit and normal readings should be 0 ohms resistance unless otherwise specified in technical data. Resistance or lack of continuity indicates faulty wiring that must be repaired or replaced.

I hope the information in this article has helped point you in the right direction to correct the issue with your electronic throttle control system. This article is strictly informational and your vehicle-specific technical data and service bulletins should always take priority.

P2108 – Throttle Actuator Control Module Performance

Code Severity and Symptoms

The severity of this code can range from moderate to severe depending on the specific malfunction. Symptoms of a P2108 fault code may include:

Engine does not start
Worsening poor performance
Little or no throttle response
Check engine light illuminated
Exhaust smoke
Increased fuel consumption

Common Causes of P2108 Code

Possible causes of this code may include:

Faulty throttle body
Dirty throttle plate or linkage
Defective throttle position sensor
Faulty accelerator pedal position sensor
Defective throttle actuator control motor
Corroded or damaged connector
Faulty or damaged wiring
Faulty PCM
Common repairs
Throttle body replacement
Cleaning throttle plate and linkage
Throttle position sensor replacement
Throttle actuator control motor replacement
Accelerator pedal position sensor replacement
Cleaning connector corrosion
Repairing or replacing wiring
Replacing PCM

Diagnostic and Repair Procedures

The second step is to locate all components associated with the electronic throttle control system. This will include the throttle body, throttle position sensor, throttle actuator control motor, PCM, and accelerator pedal position sensor on a simplex system. Once these components are located, a thorough visual inspection should be performed to check that all associated wiring shows no obvious defects such as scraping, rubbing, bare wires, burning, or melted plastic. Next, check each component’s connectors for security, corrosion, and damaged pins.

Advanced Steps

Circuit Checks

With the ignition switch in the off position, disconnect the electrical connector from the throttle body. Locate the 2 pins that go to the motor(s) on the throttle body. Using a digital ohmmeter set to ohms, check the resistance of the motor(s). The motor should read approximately between 2 and 25 ohms depending on the specific vehicle (consult manufacturer specifications for your vehicle). If resistance is too high or too low, the throttle body will need to be replaced. If all tests have passed up to this point, you’ll want to check the motor voltage signals.

P2109 Throttle/Pedal Position Sensor A Minimum Stop Performance

How severe is this DTC?

A P2109 should be considered severe as it can result in the vehicle being undrivable.

What are some symptoms of the code?

Symptoms of a P2109 trouble code may include:

Unresponsive accelerator
Limited or no acceleration
Engine stalling at idle
Hesitation during acceleration
Inoperative cruise control

What are some common causes of the code?

Causes

of this P2109 throttle/pedal position sensor code may include:

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

What are the P2109 troubleshooting steps?

Check your vehicle information source for technical service bulletins (TSB) matching the vehicle’s make, model and engine size. Symptoms and stored codes should also match. If you find a matching TSB, it will significantly assist your diagnosis.

My diagnosis for a P2109 code typically begins with a visual inspection of all cables and connectors related to the system. I would also 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 a P2109 code being stored. 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.

You’ll need a diagnostic scanner, digital volt/ohmmeter (DVOM) and a reliable vehicle information source to accurately diagnose this code.

Next, connect the scanner to the vehicle’s diagnostic port and retrieve all stored trouble codes. Record them in case you need the information later in your diagnosis. Also save all associated freeze frame data. These notes may prove useful, especially if P2109 is intermittent. Now clear the codes and test drive the vehicle to see if the code resets.

If the code immediately resets, 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 and/or inconsistencies are detected, use the DVOM to retrieve live data from each sensor signal wire. To retrieve live data with the DVOM, connect the positive test lead to the appropriate signal wire and the ground test lead to the ground circuit, then observe the DVOM display while operating the DBW. Look for voltage spikes when the accelerator is slowly moved from closed position to wide open throttle. Voltage typically ranges from 0.5 volts at throttle closed to 4.5 volts at wide open throttle, but consult your vehicle information source for exact specifications. If spikes or other irregularities are detected, suspect the tested sensor is faulty. An oscilloscope is also an excellent tool for testing sensor operation.

If the sensor operates as expected, disconnect all associated controllers and test individual circuits with the DVOM. System wiring diagrams and connector pinout charts can help determine which circuits to test and where to find them on the vehicle. Repair or replace system circuits as needed.

Only suspect a faulty PCM or PCM programming error after all system sensors and circuits have been verified.

Some manufacturers require the throttle body, throttle actuator motor and all throttle position sensors to be replaced as a single unit