Exhaust Temperature Sensor 2 Circuit Range/Performance Problem
Issues with the exhaust temperature sensor circuit.
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What it means (plain English)
The exhaust temperature sensor measures how hot the exhaust gases are. If it sees a temperature that's too high or too low, it’ll trigger this code.
What the computer is actually seeing
The engine control module (ECM) monitors the voltage output from the exhaust temperature sensor. The sensor is typically expected to output between 0.5V to 4.5V depending on the exhaust temperature. If it detects values outside of this range, the code gets set.
What a healthy reading looks like
0.5V to 4.5V, depending on exhaust temperature—around 0.5V at approximately 200°F and up to 4.5V at around 2000°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.
- 1Check the wiring and connectors to the exhaust temperature sensor for damage or corrosion.
- 2Inspect exhaust system for restrictions or back pressure issues.
- 3Verify the sensor's voltage output by back probing the connector. It should range between 0.5V and 4.5V under normal operating conditions—replace the sensor if it's out of range.
- 4Check for any exhaust leaks that may affect sensor readings.
- 5Clear the code and monitor for reoccurrence to determine if the issue is intermittent.
Common causes
- Faulty exhaust temperature sensor
- Wiring or connector issue
- Excessive exhaust back pressure
- Faulty ECM input error
- Temperature fluctuations due to a malfunctioning turbo or EGR system
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Can I keep driving with this code?
It's drivable, but fix soon to avoid potential damage to the emissions system.
Will this code come back after resetting?
It might, especially if the underlying issue isn't fixed.
Why does this code sometimes appear with other codes?
It often pairs with codes related to other exhaust or temperature sensors, indicating potential systemic issues.
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