Exhaust Gas Temperature Sensor Circuit High
The exhaust gas temperature sensor is reading a voltage that is too high.
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What it means (plain English)
Inside the system, the exhaust gas temperature sensor measures the temperature of the exhaust gases. When it works correctly, it sends a voltage signal proportional to the temperature. If the sensor detects a temperature that seems too high, it sends a higher voltage (over 4.5 volts) to the engine control module (ECM). This can trigger a fault code.
What the computer is actually seeing
The ECM detects a voltage signal from the exhaust gas temperature sensor exceeding the maximum threshold, which typically indicates a potential failure of the sensor or a wiring issue.
What a healthy reading looks like
Normal operating voltage should be between 0.5 to 4.5 volts depending on the temperature range. A reading above 4.5 volts indicates a problem.
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; fix any issues found.
- 22. Check the exhaust gas temperature sensor connector for secure fitment; reseat if loose.
- 33. Measure the voltage at the exhaust gas temperature sensor while the engine is running; normal should be between 0.5 to 4.5 volts. If above 4.5 volts, proceed to step 4.
- 44. Disconnect the sensor and recheck the voltage at the connector. If it drops to normal (0.5-4.5 volts), sensor is faulty and should be replaced. If still high, check the wiring harness back to the ECM for shorts.
Common causes
- Faulty exhaust gas temperature sensor
- Damaged wiring or connectors
- Short circuit in the sensor circuit
- Exhaust system issues like leaks affecting sensor readings
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
While the vehicle may still operate, performance and emissions may be negatively affected. It's best to fix it soon.
Will this code come back after resetting?
If the underlying issue isn't fixed, the code will likely return.
Why does this code sometimes pair with others?
It can indicate multiple issues related to the exhaust system or temperature sensor failures, leading to multiple fault codes.
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