P2129 Fault Code

Throttle/Pedal Position Sensor/Switch E Circuit Intermittent

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2129 fault code indicates an intermittent issue with the Throttle/Pedal Position Sensor/Switch E Circuit. This circuit is crucial for relaying the driver's input on throttle position to the engine control module (ECM). When this signal is unstable, it can lead to poor engine performance and drivability issues.

What are the symptoms of the P2129 code?

Common symptoms associated with a P2129 fault code may involve:

• Check Engine Light (CEL) illumination.
• Unresponsive or erratic throttle behavior.
• Reduced engine power or acceleration difficulties.
• Engine stalling while driving.
• Inconsistent or fluctuating RPM during idle.

What causes the P2129 code?

The causes of a P2129 code can include:

• Wear and tear on the throttle position sensor.
• Poor electrical connections in the sensor circuit.
• Damaged wiring or connectors that may be shorting or open.
• Issues with the accelerator pedal assembly.
• Malfunctions in the engine control module.

How to fix P2129?

To address a P2129 fault code, consider the following steps:

• Inspect the throttle position sensor and wiring for any visible damage or corrosion.
• Check connectors for poor contact and repair or replace as needed.
• Test the throttle position sensor's voltage output; if outside specifications, replace the sensor.
• Clear the fault code and take the vehicle for a test drive to see if the issue recurs.
• If the problem persists, further diagnose the engine control module and related components.