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2012 MERCEDES-BENZ GL
4.6L V8•AWD•AUTOMATIC•gas•M273•turbo
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Repairs0Labor494Torque2175Fluid10DTC1852Battery2Maintenance0Recalls0
P1542high severityPowertrain

Accelerator Pedal Position Sensor Malfunction

on 2012 Mercedes-Benz GL 4.6L V8 · AWD

What this code means

The ECU detected a malfunction in the accelerator pedal position sensor. The signal does not correlate with expected values, affecting throttle control accuracy and safety.

Symptoms

  • Check Engine Light
  • Reduced power mode
  • Poor throttle response
  • Engine may only idle
  • ETC warning light

Common causes

  • Faulty accelerator pedal sensor
  • Wiring damage to pedal sensor
  • Corroded pedal connector
  • Pedal sensor out of calibration
  • ECU input circuit fault

Diagnostic steps

  1. Read accelerator pedal position values with scan tool
  2. Check both pedal sensor signals for proper tracking
  3. Inspect pedal connector and wiring
  4. Test sensor supply voltage
  5. Perform pedal adaptation

Repair notes

Replace the accelerator pedal module if the internal sensor has failed.

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