The P2107 code refers to an issue with the Throttle Actuator Control Module Processor. This means the car’s computer has detected a problem within the throttle actuator control (TAC) system, specifically with the module’s processor. This can affect the vehicle’s acceleration and overall performance, making it a concern that should be addressed promptly.
P2107 quick overview
| Meaning | P2107: Throttle Actuator Control Module Processor |
| Is it serious? | Yes, it can significantly affect vehicle performance and drivability. |
| Possible causes | – Faulty throttle body or actuator – Wiring issues or voltage drops – PCM issues, including software needing an update or hardware failure |
| How to diagnose? | Check for any recalls or TSBs related to the throttle system or PCM Inspect the throttle body for physical damage or obstructions Test the throttle position sensor and pedal assembly for proper operation Examine wiring and connectors for damage or corrosion Verify PCM software is up to date and consider reprogramming if necessary |
P2107 Meaning
Understanding the P2107 code is crucial, as it signals a problem with your car’s throttle system, which controls how much air enters the engine. This can lead to issues such as uneven acceleration, loss of power, or your car entering a fail-safe mode to prevent further damage.
The cause could be anything from a faulty throttle body, electrical issues, or even problems with the car’s main computer. It’s a complex issue that might require a professional to diagnose and fix properly.
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
How to fix P2107 – learn from mechanics
I looked into P2107 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Lincoln
Vehicle information
2005 Lincoln LS Sport 3.9L
Issue + repair history
- Replaced spark plugs & heater control valve one week before the problem
- Replaced throttle body due to shorting out
- Replaced PCM and reprogrammed to calibration #5w4a-12650-ee
Other OBD2 Codes + Test Results
- P2107: Throttle Actuator Control Module Processor
- P2110: Throttle Actuator Control System – Forced Limited
Mechanic suggestions
- Replace spark plugs with Motorcraft ONLY and all 8 coils with Motorcraft to address throttle codes and potential misfire issues
- Check all computer grounds in case a ground was disconnected during previous repair
- Run pinpoint tests for the accelerator pedal sensor and PCM
- Check the pedal assembly
Final fix
- Replaced all ignition coils, which resolved the issue and the car ran great
Case #2: Mazda
Vehicle information
2005 Mazda 6 S 3.0L – Low vacuum, O2 sensors at 0V
Issue + repair history
- Replaced PCM and swapped throttle body from donor car; same results
Other OBD2 Codes + Test Results
- P2107: Throttle actuator control module processor
- Compression: 175psi across all 6 cylinders
- No vacuum leak detected via smoke test
- No misfire detected
Mechanic suggestions
- Faulty throttle body; check for stuck open purge valve
- Block EGR valve if stuck open
- Possible PCM failure; suggested PCM replacement and Programmable Module Installation
- Updated throttle body motor from Mazda; requires idle relearn with compatible scan tool
Final fix
- Issue was GR wire on TB connector showing 0.2-2.1V, indicating a significant voltage drop. Continuity lost under battery harness. Ran a new wire from PCM, resolving the issue.
Case #3:
Vehicle information
2004 Ford Thunderbird 3.9L – Reprogram/ECU considered
Issue + repair history
- Replaced throttle actuator, but the same two codes reappeared after drive cycle
Other OBD2 Codes + Test Results
- P2110
- P2107
Mechanic suggestions
- Ignition misfires may set erroneous throttle body DTCs; check for suspect cylinder with power balance
- Replace suspect coil(s) and check for oil intrusion in spark plug wells
- Check each ignition coil with spark tester for good output and no leakage
- Coil voltage spikes into wiring and PCM can confuse it; careful inspection advised
- TSBs and recalls up to 100k miles for the coils; recommend dealer service
Final fix
- Replaced spark plugs and valve cover gaskets to address a small misfire causing the erroneous CEL lights, resolving the issue.
How to diagnose P2107
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
| Diagnostic Step | Brief Explanation |
|---|---|
| Replace spark plugs and coils | Addresses misfire issues which can indirectly cause throttle codes |
| Check all computer grounds | Ensures proper electrical connections and grounding |
| Run pinpoint tests for accelerator pedal sensor and PCM | Identifies issues with signal from pedal to throttle control |
| Inspect throttle body and wiring | Looks for physical or electrical damage |
| Reprogram/Update PCM | Updates the car’s computer software to ensure proper operation |
| Replace or repair faulty throttle body components | Fixes any malfunctioning parts of the throttle system |
| Check for voltage drops or wiring issues under battery harness | Solves electrical problems affecting throttle control |
Each of these steps, derived from real mechanic suggestions, highlights the importance of thorough diagnostics to pinpoint the exact cause of the P2107 code. Whether it’s replacing ignition components, updating the PCM, or repairing wiring, each case underscores the need for specific fixes tailored to the vehicle’s issues.
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko