Engine-Codes - Mercedes-Benz - P0781 Mercedes-Benz

P0781 Mercedes-Benz Code - 1-2 Shift Malfunction

- Code Popularity: 2,221 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code P0781 Mercedes-Benz?

  • Low transmission fluid level
  • Dirty transmission fluid
  • Faulty shifting solenoid valve
  • Shifting solenoid valve harness is open or shorted
  • Shifting solenoid valve circuit poor electrical connection

|How to Fix the P0781 Mercedes-Benz Code?

Start by checking 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's pins.

|What is the Cost to Diagnose the Code P0781 Mercedes-Benz?

Labor: 1.0

The cost to diagnose the P0781 Mercedes-Benz code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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|When is the P0781 Mercedes-Benz Code Detected?

The P0781 code is detected when actual gear position and the commanded gear position are different

|What are Code P0781 Mercedes-Benz Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Transmission may not shift to the next gear.

|What Does the P0781 Mercedes-Benz Code Mean?

This P0781 code indicates that the 1-2 shift valve in the valve body is locked in the direction of the spring compression. The Transmission Control Module (TCM) controls the gearshifts by turning the shift solenoid valves ON/OFF and switching oil pressure to the valves in the valve body. The TCM calculates the actual transmission gear by comparing the signals from the input speed sensor and the output speed sensor.

P0781 Mercedes-Benz Code - 1-2 Shift Malfunction

|Need more Information on the P0781 Mercedes-Benz Code?

Need more information on how to fix the P0781 Mercedes-Benz code? Get Access to Factory Service Manuals

|Need Help with the P0781 Mercedes-Benz Code?

Get the P0781 Mercedes-Benz code diagnosed by a professional: Find a repair shop in your area