Common symptoms
With fault code P2138, you may encounter one or more of the following signs:Â
1. The Check Engine Light Is On
An illuminated Check Engine Light on your dashboard could mean that your PCM has detected a malfunction with the TP or APP sensor that could be affecting your vehicle’s performance.
However, since the Check Engine Light could signify a host of engine issues, you’ll need an OBD2 scan tool to determine the actual problem. Â
2. Trouble Accelerating
When the Powertrain Control Module or Engine Control Module (ECM) logs code P2138, you’ll experience difficulties accelerating your car.
This could be because the PCM is receiving conflicting information about the accelerator pedal and cannot determine the exact gas pedal position. As a result, there’s a delay or lack of response when you accelerate.Â
3. The Vehicle Goes Into Limp Mode
Your vehicle’s computer may enter limp mode when it registers the fault code P2138. This safety feature protects you and your vehicle from dangerous situations.
When this happens, the Reduced Engine Power (REP) light may pop on your dashboard, indicating that your vehicle speed is limited. You may even experience other issues with the air-conditioning or gear system.Â
4. A Sudden Loss Of Engine Power
Sometimes, fault code P2138 may cause a sudden loss of engine power.
This issue occurs when the accelerator pedal position sensor fails, forcing you to stop. When this happens, it’s best to consult a reputable mechanic to diagnose and fix the problem.
Note: The P2138 code is a common issue with Acura, Subaru, Chevrolet, and Honda motor company vehicles.