Fault code P0711 – a step-by-step guide to diagnosing and fixing it

Error code P0711 is displayed and the check engine light is on - what does this mean?

The OBD system detects a fault in the transmission oil temperature sensor circuit that is outside the expected range. This DTC P0711 relates to the automatic transmission and its temperature monitoring. For various manufacturers, this fault code may also be referred to as "Transmission Fluid Temperature Sensor A Circuit Range/Performance".

What causes can this fault code have?

• Defective transmission fluid temperature sensor
• Damaged cable connections to the sensor
• Corroded or loose plug connections
• Defective transmission control unit (TCM)
• Short circuit or interruption in the sensor cable
• Dirty or clogged sensor
• Low transmission oil level
• Defective ground connection in the sensor system

What symptoms occur in parallel with fault code P0711?

• Shifting problems: The automatic transmission shifts irregularly or jerkily
• Emergency program: The transmission switches to safety mode with limited gears
• Delayed shifting: Gear changes occur later than normal
• Overheating: The transmission can overheat because the temperature monitoring is faulty
• Starting problems: In rare cases, the vehicle is unable to start
• Warning lights: In addition to the engine warning light, a transmission warning light may also come on

How can the problem with error code P0711 be rectified?

• The repair requires a systematic approach to identify the exact cause.
• Replace the transmission oil temperature sensor: Locate the defective sensor, remove it and replace it with a new original part, then reset the system using an OBD scanner
• Check and repair wiring harness: Inspect all wires between sensor and control unit for damage, replace or repair defective wires and re-insulate connections
• Clean and secure plug connections: Disconnect sensor plug, clean contacts with contact spray, check for corrosion and reconnect firmly
• Check transmission oil level and top up: Check the oil level when the engine is warm, top up with the correct ATF oil if necessary and check for contamination or discoloration at the same time
• Diagnose the transmission control unit: Check TCM with professional diagnostic technology, replace if defective and then have it reprogrammed
• Carry out a complete system diagnosis: Use an EOBD tester to read out all transmission system parameters, monitor sensor signals in live mode and systematically test all components