Engine Temperature Sensor Voltage High
Indicates that the engine temperature sensor voltage is higher than expected.
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What it means (plain English)
The engine control unit (ECU) gets readings from the engine temperature sensor. If that reading goes too high, it thinks something's wrong and can cause performance issues or trigger a fault.
What the computer is actually seeing
The ECU reads voltage from the engine temperature sensor; when that voltage exceeds its set threshold (typically above 4.5V), it triggers this fault code.
What a healthy reading looks like
Normal operation typically shows 0.5V to 4.5V depending on temperature; over 4.5V indicates failure.
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.
- 1Check the wiring and connector for damage or corrosion; repair as necessary and retest.
- 2Measure voltage at the engine temperature sensor connector; should be less than 4.5V.
- 3If voltage is above 4.5V, check for shorts in the wiring harness; repair as necessary.
- 4If wiring is good, replace the engine temperature sensor; retest after installation.
Common causes
- Shorted wiring harness to the engine temperature sensor
- Faulty engine temperature sensor
- Issues with the ECU itself
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, this code can affect engine performance and may cause overheating.
Will the check engine light go off by itself?
Not usually; you need to address the underlying issue for the light to clear.
Can this code pair with other codes?
Yes, it often pairs with other sensor-related codes indicating systemic issues.
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