Error code

OBD2 P2120

OBD2P2120
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Throttle/Pedal Position Sensor/Switch 'D' Circuit.

Severity

highThe vehicle may be drivable but will likely operate in a fail-safe mode with limited performance.

Summary

Code P2120 indicates an issue with the throttle pedal position sensor's circuit labeled 'D'. This code is related to the accelerator pedal position (APP) or throttle position (TP) sensor and can affect drive-by-wire systems.

Symptoms

  • Stored trouble code and illuminated MIL (CHECK ENGINE) light
  • Vehicle may be in a fail-safe or limp mode, limiting engine speed or immobilizing it completely

Common Causes

  • Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors
  • Defective or malfunctioning throttle pedal position sensor
  • Excessive mechanical wear of moving parts in the sensor
  • Failure to perform a prescribed relearning procedure after replacing the throttle position sensor

Diagnosis

  1. Inspect and test all wiring, connectors, and sensors related to the throttle pedal position sensor circuit 'D'
  2. Check for any additional codes that might provide more context
  3. Perform a relearning procedure if applicable after replacing or repairing components

Fixes

  • Replace damaged or malfunctioning wiring, connectors, and sensors as needed

FAQ

What does code P2120 mean?

Code P2120 indicates an issue with the throttle pedal position sensor's circuit labeled 'D'. This can affect drive-by-wire systems and may cause the vehicle to enter a fail-safe mode.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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