Engine Temperature Sensor Circuit High
This code indicates a high voltage reading from the engine temperature sensor.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine temperature sensor measures how hot the engine is running. If it shows a high voltage (usually above 4.5 volts), the computer thinks the sensor is malfunctioning or that the engine is overheating.
What the computer is actually seeing
The Engine Control Module (ECM) expects to see a voltage from the engine temperature sensor between 0.5 to 4.5 volts. A reading above 4.5 volts signals an issue, which leads to this fault code being triggered.
What a healthy reading looks like
Expected voltage range from the engine temperature sensor is 0.5 to 4.5 volts. Coolant temperature should ideally be around 190°F to 220°F during normal operation.
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. Inspect the wiring and connectors of the engine temperature sensor for damage or corrosion. Secure and repair as necessary. Decision: Is wiring intact? Yes -> Go to Step 2; No -> Repair wiring.
Common causes
- Faulty engine temperature sensor
- Wiring issues or bad connections
- Short circuit in the sensor circuit
- ECM malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not advisable to drive long distances, as overheating can cause damage; diagnose and fix soon.
Will the code come back after clearing?
If the fault is unresolved, it likely will return after a drive cycle.
Why does this code often pair with SPN 711?
SPN 711 is for a low signal from the engine temperature sensor, indicating the sensor may be faulty.
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