Engine Temperature Sensor 2

The engine computer has detected that the second temperature sensor is sending bad information, meaning it either sees a temperature that’s too high or too low that doesn’t match the engine’s actual temperature.

The engine control module (ECM) is receiving a temperature reading from the secondary engine temperature sensor that is outside the normal operating range, typically below 50°C (122°F) or above 150°C (302°F).

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. 1Inspect engine coolant level; top off if low.
2. 2Check wiring and connectors for the secondary temperature sensor. Look for frayed wires or corrosion.
3. 3Using a scan tool, compare readings from the primary temperature sensor and secondary sensor. They should be within 10°C of each other.
4. 4Monitor the secondary temperature sensor while the engine is running to see if it exhibits erratic behavior or unusual ranges. If it does, replace the sensor.
5. 5If the sensor is good, verify that the engine control module (ECM) is functioning correctly. If it malfunctions, reprogram or replace as necessary.

• Faulty secondary temperature sensor
• Wiring issues, such as shorts or open circuits
• Connector corrosion or bad connections
• ECM software glitch or malfunction
• Coolant leaks affecting the sensor's performance

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