Engine Exhaust Temperature Sensor Circuit High
This code indicates a high voltage reading from the engine exhaust temperature sensor.
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What it means (plain English)
The engine exhaust temperature sensor measures how hot the exhaust gases are. If it sees a voltage above a certain threshold, around 4.5 volts, it triggers this code because something may be wrong with the sensor or the wiring.
What the computer is actually seeing
The computer expects the engine exhaust temperature sensor to output a voltage between 0.5 to 4.5 volts, corresponding to temperatures from approximately -40°F to 1500°F. A voltage above 4.5 volts indicates a malfunction.
What a healthy reading looks like
Expected voltage output at proper operation: 0.5 - 4.5 volts; typical temperature range: -40°F to 1500°F.
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 wiring and connectors for the exhaust temperature sensor for frays or corrosion. Fix if necessary.
- 22. Measure the voltage at the sensor connector when the engine is running. Expecting 0.5 - 4.5 volts. If above 4.5 volts, replace the sensor.
- 33. If voltage is normal, check the wiring for continuity to the ECM. Look for open circuits or shorts.
- 44. If wiring is fine, consider reprogramming or replacing the ECM if other faults are present.
Common causes
- Faulty engine exhaust temperature sensor
- Shorted wiring or connections
- Open circuit in sensor wiring
- ECM software issue
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; the vehicle should be okay for short distances but fix soon to avoid potential overheating issues.
Will this code come back after clearing?
If the issue isn't fixed, yes, it will return.
Why might this pair with other codes?
It often pairs with other temperature or sensor issues indicating related problems in the exhaust management system.
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