Transmission Fluid Pressure Sensor/Switch ‘A’ Circuit
Table of contents
P0840 MERCEDES-BENZ Possible 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
How do I fix code P0840 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’s pins.
Cost of diagnosing the P0840 MERCEDES-BENZ code
The cost of diagnosing the P0840 MERCEDES-BENZ code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
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.