Fault code P0736 – a step-by-step guide to diagnosing and fixing it

Error code P0736 is displayed and the check engine light is on - what does this mean?

DTC P0736 is triggered by the OBD/EOBD system when a problem is detected with the reverse gear circuit in the automatic transmission. This trouble code indicates a malfunction in the reverse gear solenoid or the associated electrical components. Different manufacturers may have slightly different names for this fault code, but it always refers to the reverse gear shift circuit.

What causes can this fault code have?

• Defective reverse gear solenoid
• Damaged wiring to the transmission control unit
• Loose or corroded plug connections
• Low transmission oil level or contaminated ATF
• Defective transmission control module (TCM)
• Mechanical problems in the transmission valve body
• Clogged transmission oil filter
• Internal transmission damage

What symptoms occur in parallel with fault code P0736?

• Reverse gear does not work: The vehicle does not move backwards or reacts with a delay
• Hard gear changes: Jerky or unusually hard gear changes
• Gearbox slippage: Engine revs up, but the vehicle does not accelerate accordingly
• Unusual noises: Rattling or grinding when engaging reverse gear
• Emergency running program: Transmission only shifts into a few gears or remains in emergency running mode
• Delayed shift response: Longer waiting time when engaging gears

How can the problem with error code P0736 be rectified?

• The repair requires a systematic diagnosis to identify the exact cause.
• Check transmission oil level and quality: Check ATF level, top up or change if necessary, while also replacing transmission oil filter
• Check electrical connections: Clean all plug connections on the transmission, check wiring for damage and repair defective cables
• Replace reverse gear solenoid: Identify defective solenoid and replace with new original part, replacing seals in the process
• Diagnose transmission control unit: Test TCM with professional software and replace or repair if defective
• Clean or replace the valve body: Remove transmission valve body, clean thoroughly or replace if heavily soiled
• Complete transmission repair: Have the transmission overhauled or replaced in the event of internal damage