Engine Coolant Temperature Out of Range
The engine coolant temperature sensor is reporting a value outside the expected range.
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What it means (plain English)
The engine computer measures the coolant temperature to manage engine performance. If the temperature sensor sends readings that are too high or too low, it indicates a potential problem with the engine's cooling system.
What the computer is actually seeing
The engine control module (ECM) reads the coolant temperature sensor value. It expects to see temperatures usually between 190°F and 220°F (88°C and 104°C) during normal operation. If it reads below 140°F (60°C) or above 250°F (121°C), it will trigger this code.
What a healthy reading looks like
Normal coolant temperature should be around 190°F to 220°F (88°C to 104°C) during standard operation; below 140°F (60°C) or above 250°F (121°C) triggers the fault.
Guided diagnostic — the DiagCoach way
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.
- 11. Check the engine coolant level; ensure it is at the proper level before further checks.
- 22. Inspect the wiring and connectors to the coolant temperature sensor for any damages like fraying or corrosion.
- 33. Use a scan tool to read the live data from the coolant temperature sensor. Verify if the readings are consistent with actual engine temperature.
- 44. If the sensor reads below 140°F (60°C) or above 250°F (121°C), replace the coolant temperature sensor and recheck the code.
- 55. If the sensor readings are normal, check for shorts or opens in the wiring between the sensor and ECM.
Common causes
- Faulty coolant temperature sensor
- Wiring issues (shorts or open circuits)
- Coolant leaks
- Thermostat malfunction
- Faulty engine control module (ECM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s not immediate to stop driving, but the engine may run improperly leading to potential overheating or performance loss.
Will this code come back after I fix it?
If the cause is correctly addressed, the code should not return.
Why does this code often pair with SPN 1913?
SPN 1913 often indicates that the sensor is reading excessively high temperatures, which can occur if the cooling system is compromised.
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