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P2138 Mercedes-Benz Code - Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

- Code Popularity: 12,069 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P2138 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 Throttle/Pedal Position Sensor/Switch 'D'/'E'
  • Throttle/Pedal Position Sensor/Switch 'D'/'E' harness is open or shorted
  • Throttle/Pedal Position Sensor/Switch 'D'/'E' circuit poor electrical connection
  • Faulty Engine Control Module (ECM)
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How to Fix the DTC P2138 Mercedes-Benz?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

Mercedes Benz Code = 0089 Voltage of Hall sensor 1 does not agree with the voltage of Hall sensor 2. (P2138)

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2138 Mercedes-Benz code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

Code P2138 Mercedes-Benz Description

This fault code is stored in the Engine Control Module (ECM) when a fault is detected with the circuit monitoring throttle and accelerator pedal position. Both circuits are closely monitored for plausibility checks. The ECM can easily identify erroneous data by monitoring both circuits for an inconsistency between the throttle position sensor voltage and the accelerator pedal position sensor voltage. Normally potentiometers are used for both sensor circuits, however some manufacturers may use a hall effect sensor with a varying frequency depending on position. Another feature of modern vehicles is using multiple sensors for redundancy and fault analysis. This is where a technician would see data for accelerator pedal position sensor 1 and 2 or throttle position sensor 1 and 2. The voltages from these components can be inversely proportional or a stepped waveform with only output half the output of the other.

OBDII Code P2138 Mercedes-Benz - Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation - AutoCodes.com
P2138 Mercedes-Benz Code - Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

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