Engine Coolant Temperature (ECT) Sensor 2 Out of Range
The ECT Sensor 2 is reporting a temperature that is outside the normal range.
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What it means (plain English)
The second engine coolant temperature sensor is sending readings that are either too high or too low for the engine's operating conditions, showing a potential fault.
What the computer is actually seeing
The engine control unit (ECU) expects the ECT reading to be between 180°F and 220°F (82°C to 104°C) during standard operation. If readings fall below 140°F (60°C) or above 250°F (121°C), it triggers this code.
What a healthy reading looks like
Expect ECT Sensor 2 to read between 180°F to 220°F regularly under normal operating conditions.
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. Visually inspect the ECT Sensor 2 wiring and connectors for damage or corrosion. If damaged, repair or replace the wiring/connectors. Decision: If wiring/connector is okay, proceed to step 2.
- 22. Check coolant level in the reservoir and radiator. Ensure it's at the recommended level as per manufacturer specs. Decision: If coolant is low, top it up, and retest. If coolant is fine, proceed to step 3.
- 33. Using a scan tool, monitor the ECT Sensor 2 values while the engine is running. Are the values between 180°F and 220°F? Decision: If not, replace ECT Sensor 2. If within range, check engine for other issues.
Common causes
- Faulty ECT Sensor 2
- Wiring issues or bad connectors for the sensor
- Low coolant levels affecting sensor readings
- Coolant leaks causing incorrect temperature measurements
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's recommended to fix this code soon, as it can affect engine performance and efficiency.
Will this code come back after repair?
If the underlying cause is properly fixed, the code should not return.
Why do I see this code alongside SPN 110?
SPN 110 indicates a similar issue with the primary ECT sensor, which might fail simultaneously with ECT Sensor 2.
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