Temperature Sensor - High Temperature Condition

This code means the temperature sensor is reading a temperature higher than what the engine should normally run at, usually over 240°F (115°C).

The engine control module (ECM) sees voltage readings from the temperature sensor that exceed the expected maximum, indicating an unsafe temperature level.

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. Inspect the wiring and connector to the temperature sensor for damage or corrosion. Repair or replace as needed. Decision point: Is the wiring intact? If yes, proceed to step 2. If no, fix wiring issue.
2. 22. Check the coolant level in the reservoir and radiator. Ensure it is between the minimum and maximum marks. Decision point: Is the coolant level adequate? If yes, proceed to step 3. If no, top off coolant and monitor for leaks.
3. 33. Use a multimeter to test the resistance of the temperature sensor. Compare readings to manufacturer specifications (typically 2200 ohms at 68°F/20°C). Decision point: Is the sensor within spec? If yes, proceed to step 4. If no, replace the sensor.
4. 44. Start the engine and monitor the temperature reading in the scan tool as the engine warms up. Decision point: Is the reading normal? If yes, the issue may have been intermittent. If no, proceed to step 5.
5. 55. Check engine thermostat operation. Ensure it opens at the correct temperature (typically around 195°F/90°C). Decision point: Is the thermostat functioning correctly? If yes, further diagnosis of potential engine overheating or ECM issues may be needed. If no, replace the thermostat.

• Faulty temperature sensor
• Wiring issues or bad connections
• Low coolant levels
• Faulty engine thermostat
• Engine overheating due to external factors

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