P2157 moderate

Throttle/Pedal Position Sensor/Switch D Circuit

The P2157 code means the vehicle's onboard diagnostic system has detected: Throttle/Pedal Position Sensor/Switch D Circuit. This is a moderate severity code.

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Keep driving?: Short distances only
DIY difficulty: moderate
Estimated cost: $80 - $400 (parts and labor)

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Common Symptoms

Check Engine Light on
Erratic throttle response
Engine may enter limp mode
Reduced power warning
Poor acceleration response

Probable Causes (Ranked by Likelihood)

Failed throttle position sensor D Very High
Wiring fault to TPS D High
Connector issue at TPS D Moderate
ECM input fault Low

Step-by-Step Diagnostic Procedure

Read TPS D data on scan tool
Inspect TPS D wiring
Measure TPS D reference voltage
Sweep throttle and monitor TPS D for dropouts

Frequently Asked Questions

What does P2157 mean?

P2157 indicates: Throttle/Pedal Position Sensor/Switch D Circuit. The ECM detected an abnormal condition in this sensor circuit.

Is P2157 serious?

Moderate. The vehicle may enter limp mode. Repair promptly.

What should I check first?

Start with a visual inspection of the sensor wiring and connector. Use a scan tool to read sensor data and compare to expected values. Check reference voltage (typically 5V) at the sensor connector.