Engine Exhaust Temperature Sensor 2 Circuit High
The engine exhaust temperature sensor 2 circuit is reading a value that is higher than the expected range.
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What it means (plain English)
The computer is seeing a temperature reading from the second exhaust temperature sensor that is unusually high, signaling a possible problem with the sensor or wiring.
What the computer is actually seeing
The ECM sees a voltage output from the sensor above its normal range, typically over 4.5 volts.
What a healthy reading looks like
Normal operation should show voltage between 0.5 to 4.5 volts depending on exhaust temperature; over 4.5 volts indicates a fault.
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 connector for the exhaust temperature sensor 2 for signs of damage or corrosion. If damaged, repair or replace as necessary.
- 22. Measure the voltage at the sensor connector with the engine running. It should be between 0.5 to 4.5 volts. If above 4.5 volts, continue to step 3.
- 33. Disconnect the sensor and measure the resistance of the sensor. Compare it to manufacturer's specifications. If it is out of spec, replace the sensor.
- 44. If the sensor checks out, inspect the wiring back to the ECM for opens or shorts and repair as needed.
Common causes
- Faulty engine exhaust temperature sensor
- Wiring issues or short circuit in the sensor circuit
- Connector corrosion or poor connection between sensor and ECM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s not recommended to drive, as high exhaust temperatures can cause further engine damage.
Will this code come back after clearing?
It may come back if the underlying issue (sensor or wiring) isn’t fixed.
Why might this code pair with SPN 4142?
Both codes relate to exhaust temperature sensors and may indicate systemic issues in the exhaust temperature monitoring system.
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