Skip to content
P2121 Powertrain

Throttle/Pedal Position Sensor "C" Range/Performance

The "C" channel of the throttle or pedal sensor produces an electrically valid signal that does not match the other channels or the operating point.

Affected components

  • Accelerator pedal sensor

Common causes

  • High likelihood: Sensor track C worn
  • Medium likelihood: Correlation with tracks A/B lost
  • Low likelihood: Sensor element aged beyond calibration window

Possible symptoms

  • Check engine light on
  • Reduced throttle response, possible limp mode
  • Hesitation or surging
  • Idle too high or too low

Diagnostic notes

  • The malfunction indicator lamp may illuminate
  • This code can affect emissions
  • A drive cycle may be required after repair

Related codes

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

You might like