Engine Temperature Sensor
An issue with the engine temperature sensor signal has been detected.
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)
Your truck's computer is reading the engine temperature sensor wrong, which could lead to overheating if not fixed properly.
What the computer is actually seeing
The engine control unit (ECU) expects the engine temperature to be within a range of 180°F to 220°F during normal operation, correlating the sensor voltage between 0.5V to 4.5V depending on the temperature. A fault indicates a persistent signal out of this range.
What a healthy reading looks like
Normal engine temperature should show approximately 194°F (90°C) reflecting a signal voltage around 2.5V; a fault triggers when the signal is below 0.2V or above 4.8V.
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 wiring and connectors for damage or corrosion.
- 22. Check coolant level—ensure it’s within specified range (minimum level typical around 1 inch above the low mark).
- 33. Use a multimeter to measure voltage at the engine temperature sensor; expect readings between 0.5V - 4.5V with the engine running at normal temperature.
- 44. If readings are abnormal, replace the engine temperature sensor and clear the code, retest.
- 55. If code returns, check wiring continuity and ground connections before replacing the ECU.
Common causes
- Faulty engine temperature sensor
- Wiring issue between sensor and ECU
- Poor connector contact
- Corrosion at terminals or connectors
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's better to fix it soon as it may overheat the engine, but it might be drivable for a short term if nothing else seems wrong.
Will this come back after clearing?
If the underlying cause isn't fixed, the code will likely return.
Why does this code pair with other codes?
Multiple sensor codes can indicate a common wiring issue or a problem with the same electrical circuit.
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