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P0840 Mercedes-Benz Code - Transmission Fluid Pressure Sensor/Switch 'A' Circuit

- Code Popularity: 5,132 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0840 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 Transmission Fluid Pressure Sensor/Switch 'A'
  • Transmission Fluid Pressure Sensor/Switch 'A' harness is open or shorted
  • Transmission Fluid Pressure Sensor/Switch 'A' poor electrical connection
  • Transmission Valve Body
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How to Fix the DTC P0840 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.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0840 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 P0840 Mercedes-Benz Description

The Transmission Control Module (TCM) monitors the Transmission Fluid Pressure Sensor/Switch signal. The TCM sets the OBDII code when the Transmission Fluid Pressure Sensor/Switch is not to factory specifications.

OBDII Code P0840 Mercedes-Benz - Transmission Fluid Pressure Sensor/Switch 'A' Circuit - AutoCodes.com
P0840 Mercedes-Benz Code - Transmission Fluid Pressure Sensor/Switch 'A' Circuit

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