P2121
Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance
P2121 is an OBD-II diagnostic trouble code meaning: Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance. Common causes: gas pedal position sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $17–56.
Symptoms
- Unstable engine operation at idle
- Delayed response to pressing the gas pedal
- Engine transition to emergency mode
- Check Engine Light Illuminates
- Reduced engine power
Causes
- Gas pedal position sensor malfunction
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Corroded or damaged wires
- Engine control unit malfunction
How to Fix
- Check the condition of the gas pedal position sensor
- Check the continuity and resistance of the sensor circuit
- Inspect connectors and contacts for corrosion or damage
- If necessary, replace the gas pedal position sensor
- Check and, if necessary, replace the engine control unit
Related codes
Error P2121 by Vehicle Brand
FAQ
What does the P2121 code mean?
P2121 is an OBD-II diagnostic trouble code that indicates: Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance
What causes a P2121 error code?
The most common causes of P2121 include: Gas pedal position sensor malfunction; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Corroded or damaged wires.
How do I fix a P2121 diagnostic trouble code?
To fix P2121: Check the condition of the gas pedal position sensor. Check the continuity and resistance of the sensor circuit. Inspect connectors and contacts for corrosion or damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2121?
Limited driving only, diagnose soon
How much does it cost to fix P2121?
The estimated repair cost for P2121 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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