Transmission Oil Temperature Too High

The computer is telling you that the transmission fluid is overheating, which can cause damage if not addressed.

The engine control unit (ECU) monitors the transmission fluid temperature sensor and expects a normal operating range, typically between 160°F and 220°F (71°C - 104°C). If it sees a reading above 220°F (104°C), it triggers this code.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 11. Check the transmission fluid level and condition. Ensure it is at the proper level and not burnt or contaminated (normal level: between the 'full' and 'add' marks on the dipstick). Decision: Is the fluid level OK? Yes - go to step 2; No - top off or replace fluid and recheck code.
2. 22. Inspect the transmission fluid temperature sensor for damage and proper connection. Check for corrosion or loose wires. Decision: Is the sensor in good shape? Yes - go to step 3; No - repair or replace the sensor as needed.
3. 33. Use a scan tool to monitor the transmission fluid temperature while driving. Ensure that the readings correspond with the actual temperature (use an infrared thermometer for verification). Decision: Do the readings match expected values? Yes - go to step 4; No - consider a faulty sensor or wiring issue.
4. 44. Inspect the transmission cooler and lines for blockages, leaks, or damage. Ensure that coolant flow is unrestricted. Decision: Is the cooler operational? Yes - possible internal transmission issue; No - repair or replace cooler or lines.

• Low transmission fluid level
• Faulty transmission fluid temperature sensor
• Clogged transmission cooler
• Excessive heat due to towing or heavy loads

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