Fault code P0715 – a step-by-step guide to diagnosing and fixing it

Error code P0715 is displayed and the check engine light is on - what does this mean?

The OBD system detects a problem with the input speed sensor of the automatic transmission. This DTC P0715 indicates that the control unit is receiving no or an implausible signal from the turbine speed sensor, which is affecting transmission control.

What causes can this error code have?

• Defective input speed sensor (turbine speed sensor)
• Damaged wiring to the sensor
• Corroded or loose plug connections
• Defective transmission control unit (TCM)
• Mechanical problems in the transmission
• Dirt or metal chips on the sensor
• Interrupted ground or voltage supply
• Defective sensor disk or encoder wheel

What symptoms occur in parallel with fault code P0715?

• Shifting problems: The automatic transmission shifts jerkily or irregularly between gears. Emergency running program: The transmission switches to limp-home mode and remains in a fixed gear. Starting problems: The vehicle may not be able to be moved out of park. Increased fuel consumption: Fuel consumption increases noticeably due to inefficient shift points. Jerking when starting off: Vibrations occur particularly when accelerating from a standstill. Delayed gear changes: Shift times are significantly longer than usual.

How can the problem with error code P0715 be rectified?

• The repair requires a systematic diagnosis of the transmission components and their electrical connections.
• Replace the sensor: Replace the defective input speed sensor with a new part, replacing the seals in the process
• Repair wiring: Repair or completely replace damaged cables between the sensor and control unit
• Clean plug connections: Clean all electrical contacts on the sensor and control unit and treat with contact spray
• Change transmission oil: Replace contaminated ATF oil and replace the filter to remove metal shavings
• Replace the control unit: If the TCM is defective, replace the transmission control unit and have it reprogrammed
• Check the encoder wheel: Check the sensor disk for damage and replace if necessary