Fault code P1732 – a step-by-step guide to diagnosing and fixing it

Error code P1732 is displayed and the check engine light is on - what does this mean?

The DTC P1732 is a manufacturer-specific fault code that is recognized by the OBD system and indicates a problem with the transmission control module or the shift valve control. This trouble code mainly occurs in automatic transmissions and signals faults in the electronic transmission control unit. The exact definition of fault code P1732 can vary depending on the manufacturer, but usually refers to problems with the gearshift or hydraulic control unit.

What causes can this fault code have?

• Defective transmission control unit (TCM)
• Damaged wiring to the transmission control module
• Defective shift valves in the valve body
• Worn clutches or bands in the transmission
• Low or contaminated transmission oil level
• Faulty pressure sensors in the transmission
• Loose or corroded plug connections
• Defective solenoid valves (solenoids)
• Mechanical damage to the transmission
• Software error in the control unit

What symptoms occur in parallel with error code P1732?

• Shifting problems: The automatic transmission shifts jerkily or irregularly
• Gear change problems: Delayed or absent shifting between gears
• Emergency running program: The transmission switches to safety mode with limited gears
• Increased fuel consumption: Inefficient gear changes increase fuel consumption
• Loss of engine power: Reduced acceleration and driving performance
• Unusual noises: Rattling, grinding or whistling from the transmission area
• Vibrations: Noticeable vibrations while driving or when changing gear

How can the problem with error code P1732 be rectified?

• Repairing EOBD error code P1732 requires a systematic approach to identify the cause.
• Check the transmission oil level and quality: Check oil level, top up if necessary or change completely, as dirty or insufficient oil is often the cause
• Check electrical connections: Check all plug connections to the transmission control unit for corrosion, looseness or damage and clean or replace if necessary
• Diagnose the transmission control unit: Read out TCM with professional diagnostic software and replace or reprogram if defective
• Test solenoid valves: check shift valves (solenoids) for proper function and replace defective components
• Check pressure sensors: Test hydraulic pressure sensors in the transmission and replace if there are any deviations
• Overhaul the valve body: If there are mechanical problems, remove, clean or completely replace the valve body
• Carry out gearbox flushing: Complete cleaning of the transmission system to remove deposits and particles