Engine-Codes - Mercedes-Benz - P0122 Mercedes-Benz

P0122 Mercedes-Benz Code - Throttle/Pedal Position Sensor/Switch 'A' Circuit Low Input

- Code Popularity: 26,892 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P0122 Mercedes-Benz?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other 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)

Code Tech Notes

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

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How to Fix the DTC P0122 Mercedes-Benz?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0122 Mercedes-Benz code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

What Does the P0122 Mercedes-Benz Code Mean?

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.

P0122 Mercedes-Benz Code - Throttle/Pedal Position Sensor/Switch 'A' Circuit Low Input

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