OBDII Code List

P0122 MERCEDES-BENZ - Throttle/Petal Position Sensor/Switch 'A' Circuit Low Input

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3   
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Possible causes

  • Faulty Accelerator Pedal Position Sensor
  • Accelerator Pedal Position Sensor harness is open or shorted
  • Accelerator Pedal Position Sensor circuit poor electrical connection
  • Faulty Throttle Position Sensor (TPS)
  • Faulty Engine Control Module (ECM)

Tech notes

Mercedes Benz Code = 0162 (Throttle valve actuator): Actual value potentiometer 1: Short circuit to ground (P0122)

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0122 Mercedes-benz Description

This fault code is stored in the Engine Control Module (ECM) when a malfunction is detected in the throttle control system. The driver demand is sensed via the accelerator pedal position sensor. The engine control module adjusts the throttle position accordingly and the throttle position is returned to the engine control module via the throttle position sensor. European On-Board Diagnostics (EOBD) compliant vehicles use at least two accelerator pedal position sensor and at least two throttle position sensors for redundancy. Failure of one circuit can easily be identified and vehicle operation will remain unaffected.
OBDII Code P0122 Mercedes-benz - Throttle/Petal Position Sensor/Switch 'A' Circuit Low Input  -

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Related Information

P0122 MERCEDES-BENZ Comments

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