The P2128 code is an OBD-II diagnostic trouble code that refers to a problem with the Throttle/Pedal Position Sensor/Switch “E” Circuit being too high. This code indicates that the electronic throttle control system (ETCS) is not functioning within its specified range, often leading to issues with engine performance.
What Does the P2128 Code Mean?
The P2128 code signifies that the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), has detected a high voltage signal from the Accelerator Pedal Position Sensor (APP). This sensor plays a critical role in relaying the driver’s intent for acceleration, and any malfunction can lead to significant performance issues.
What Causes the P2128 Code?
Several factors can trigger the P2128 code, including:
- Accelerator Pedal Position (APP) assembly failure
- Powertrain Control Module (PCM) failure
- Throttle control motor failure
- Wiring issues, such as shorts or opens in the throttle control circuit
What Are the Symptoms of the P2128 Code?
Drivers may experience one or more of the following symptoms when the P2128 code is triggered:
- Decreased engine performance
- Engine may enter limp home mode, which limits available power
How Serious Is the P2128 Code?
The P2128 code is classified as urgent, indicating immediate action is necessary. Failing to address this issue can lead to severe engine performance problems and potential safety risks while driving.
How to Diagnose the P2128 Code
To diagnose the P2128 code effectively, follow these steps:
- Use an OBD-II scanner to confirm the presence of the P2128 code and check for any additional codes.
- Inspect the APP sensor for any visible damage or wiring issues.
- Test the sensor’s voltage and resistance to ensure they are within the manufacturer’s specifications.
- Check the PCM for any signs of failure or software issues.
- Perform a thorough inspection of the throttle control motor and associated components.
Common Repairs for the P2128 Code
Repairs for the P2128 code may include:
- Replacing the faulty Accelerator Pedal Position (APP) sensor
- Repairing or replacing damaged wiring or connectors
- Replacing the throttle control motor if necessary
- Updating or replacing the PCM in cases of failure
How Much Does It Cost to Fix the P2128 Code?
The cost to fix the P2128 code can vary widely based on the specific issue and the vehicle make and model. On average, repairs may cost anywhere from $100 to $600, depending on parts and labor.
Can I Fix the P2128 Code Myself?
While some experienced DIY mechanics may be able to address certain issues related to the P2128 code, it is recommended to seek professional assistance for accurate diagnosis and repair. Proper diagnosis is crucial, as simply replacing parts without understanding the underlying issue may not resolve the problem.
