The OBDII error code P2135 indicates a problem with the correlation between the voltage readings from the throttle position sensor (TPS) and the accelerator pedal position sensor (APPS). This essentially means the engine control module (ECM) is detecting a mismatch in the signals it’s receiving from these two critical components. Understanding this error is crucial for proper diagnosis and repair.
A typical throttle position sensor.
Understanding the Symptoms of OBDII Code P2135
Experiencing a P2135 code can manifest in various driving symptoms, including:
- Hesitation or surging during acceleration: The engine might struggle to respond smoothly to throttle input.
- Unusually high RPM: The engine may rev higher than expected for a given pedal position.
- Engine revving without pedal input: The engine might rev even when you’re not pressing the accelerator.
- Engine stalling: The engine could stall when coming to a stop or idling.
- Illuminated Check Engine Light: The check engine light will likely turn on, signaling a problem.
Common Causes of a P2135 Code
Several factors can contribute to a P2135 error code:
- Faulty Throttle Position Sensor (TPS): A malfunctioning TPS can send incorrect voltage signals to the ECM.
- Faulty Accelerator Pedal Position Sensor (APPS): Similar to the TPS, a faulty APPS can provide inaccurate readings.
- Wiring or Connector Issues: Damaged wiring or corroded connectors in the TPS or APPS circuits can disrupt signal transmission.
- Damaged ECM: In rare cases, a faulty ECM might misinterpret the signals or fail to communicate properly. This is less common but should be considered.
Using a multimeter to test sensor voltage.
Diagnosing a P2135 Error Code
Diagnosing a P2135 code often requires specialized tools and knowledge.
- Professional Diagnostics: A qualified mechanic can use a scan tool and multimeter to check the voltage readings from the TPS and APPS, verifying they are within the manufacturer’s specifications.
- Visual Inspection: Inspecting the wiring and connectors for damage or corrosion is a crucial step.
- Technical Service Bulletins (TSBs): Checking for TSBs related to your vehicle’s make and model can reveal known issues and potential solutions.
Fixing a P2135 OBDII Code
Resolving a P2135 code typically involves one or more of the following repairs:
- Replacing the TPS: If the TPS is faulty, replacing it is often the solution.
- Replacing the APPS: Similarly, a faulty APPS should be replaced.
- Repairing Wiring or Connectors: Damaged wiring or connectors should be repaired or replaced to ensure proper signal transmission.
- ECM Replacement/Reprogramming: In rare cases, the ECM might need replacement or reprogramming.
Conclusion
The OBDII error code P2135 signals a critical issue within the throttle control system. While some DIYers might be comfortable tackling simpler repairs, diagnosing and fixing this problem often requires professional expertise. Consult a qualified mechanic for accurate diagnosis and repair to ensure your vehicle’s safe and reliable operation. Ignoring this code can lead to further damage and potentially dangerous driving conditions.
