Engine Coolant Temperature Sensor Out of Range
The engine coolant temperature sensor is reporting temperatures outside the expected range.
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What it means (plain English)
The sensor measures the coolant temperature, but it's either too hot or too cold for what the engine expects, like seeing 180°F when it should be 210°F or 70°F.
What the computer is actually seeing
The engine control module (ECM) expects coolant temperatures between 170°F (77°C) and 250°F (121°C). If it reads below 140°F (60°C) or above 255°F (124°C), it triggers this code.
What a healthy reading looks like
Coolant temperature should typically be around 190°F to 210°F (88°C to 99°C) when the engine is at normal operating temperature.
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 coolant level and condition. Ensure it's at the proper level and clean. Decision: Is the coolant good? Yes: Go to step 2. No: Correct coolant issue and recheck.
- 22. Inspect the wiring and connector at the coolant temperature sensor for damage or corrosion. Decision: Is the wiring intact? Yes: Go to step 3. No: Repair wiring/connectors and recheck.
- 33. Test the coolant temperature sensor with a multimeter. At a known temperature (like boiling water), it should read 2200 Ω at 100°C (212°F). Decision: Does the sensor test good? Yes: Check for possible ECM issues. No: Replace sensor and recheck.
Common causes
- Faulty coolant temperature sensor
- Wiring issues or poor connections
- Coolant quality or level problems
- Internal engine issues affecting temperature
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive the vehicle with this code?
Driving is generally considered safe, but monitor for overheating and prepare for potential engine issues.
Will this code return after repairs?
If all faults are addressed and components are functioning properly, it should not return.
Why does this code pair with SPN 1101 and 1102?
Those codes relate to other temperature sensors in the system, indicating a broader temperature management issue.
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