Fault code P0708 – a step-by-step guide to diagnosing and fixing it

Error code P0708 is displayed and the check engine light is on - what does this mean?

The OBD system detects a fault in the transmission control unit, more precisely a fault in the transmission range sensor circuit. This DTC P0708 affects the automatic transmission and its electronic control unit. For various manufacturers, this fault code can also be referred to as "Park/Neutral Position Switch Circuit".

What causes can this fault code have?

• Defective transmission position sensor (transmission range sensor)
• Damaged wiring to the transmission control unit
• Corroded or loose plug connections on the sensor
• Defective transmission control module (TCM)
• Mechanical problems in the shift gate
• Worn contacts in the park/neutral switch
• Short circuit in the sensor circuit
• Incorrectly adjusted or displaced sensor

What symptoms occur in parallel with fault code P0708?

• Starting problems: The vehicle can only be started in certain gear positions
• Shifting problems: Automatic transmission shifts irregularly or not at all
• Reversing light failure: The reversing lights do not work properly
• Display error: Incorrect gear display in the instrument cluster
• Emergency running program: The transmission switches to safety mode
• Electronic parking brake: Malfunctions with the automatic parking brake

How can the problem with error code P0708 be rectified?

• Repairing EOBD error code P0708 requires a systematic approach to the transmission electronics.
• Replace the sensor: Replace the defective transmission range sensor completely, checking the wiring and having the new sensor correctly calibrated (cost: 150-300 euros)
• Repair wiring: Locate damaged cables to the transmission control unit, replace defective cables and check all connections for corrosion (cost: 100-250 euros)
• Clean plug connections: Clean all electrical connections on the transmission position sensor, use contact spray and ensure tight fit of connectors (cost: 50-100 euros)
• Replace the transmission control unit: If the TCM is defective, replace the entire control unit and then have it programmed (cost: 800-1500 euros)
• Adjust the shift gate: Check the mechanical setting of the shift gate and readjust if necessary to ensure correct sensor values (cost: 200-400 euros)