Exhaust Temperature Sensor Circuit High
The exhaust temperature sensor signal is reading higher than expected.
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What it means (plain English)
The computer sees a signal from the exhaust temperature sensor that's too high, meaning your exhaust might be running hotter than normal.
What the computer is actually seeing
The exhaust temperature sensor should provide a voltage signal that typically ranges from 0.5V to 2.0V. A reading above 2.0V triggers this code.
What a healthy reading looks like
Expected voltage from the exhaust temperature sensor should be between 0.5V and 2.0V at normal operating temperature.
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 exhaust temperature sensor wiring for damage or shorts. Repair any found issues.
- 22. Check the sensor connector for corrosion or loose connections. Clean or reconnect as needed.
- 33. Measure the voltage output from the sensor while the engine is running. It should read between 0.5V and 2.0V.
- 44. If the output is higher than 2.0V, replace the exhaust temperature sensor and retest the circuit.
- 55. If the reading is within spec but the code returns, consider checking for exhaust leaks or re-flashing the ECM software if applicable.
Common causes
- Faulty exhaust temperature sensor
- Wiring issues or shorts in the sensor circuit
- Exhaust system leaks affecting temperature readings
- ECM software error
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you can drive but should fix it soon to avoid further issues.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code pair with SPN 4334?
SPN 4334 often indicates a related fault, typically in the same sensor circuit or system.
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