Exhaust Gas Temperature Sensor 2 Circuit High
This code indicates that the exhaust gas temperature sensor 2 has detected a voltage that is too high.
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What it means (plain English)
The exhaust gas temperature sensor 2 is designed to measure the temperature of the exhaust gases after they exit the engine. When the sensor reads a voltage above its normal range, it signals a problem that needs to be addressed.
What the computer is actually seeing
The ECM sees a voltage from the exhaust gas temperature sensor 2 above the normal range, typically above 4.8 volts, indicating the sensor is either malfunctioning or there is an open/short in the circuit.
What a healthy reading looks like
For proper operation, the temperature readings should range from approximately 0 to 900 degrees Celsius, translating to a voltage of about 0.5 to 4.5 volts. A reading exceeding 4.8 volts is too high.
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 wiring and connector for the exhaust gas temperature sensor 2 for any damage or corrosion. Decision: Repair any issues found or proceed to step 2.
- 22. Use a multimeter to measure the voltage at the sensor connector. Expected voltage should be between 0.5 to 4.5 volts. Decision: If voltage is above 4.8 volts, replace the sensor; if normal, proceed to step 3.
- 33. Check for short circuits in the wiring harness between the ECM and the sensor. Use a wiring diagram to inspect for continuity. Decision: If a short is found, repair the wiring; if not, proceed to step 4.
- 44. Replace the exhaust gas temperature sensor 2 and clear the fault codes. Decision: Check if the code returns after a test drive.
Common causes
- Short circuit in the wiring harness leading to the sensor
- Faulty exhaust gas temperature sensor
- Open circuit in the sensor wiring
- Corrosion or poor connection at the sensor connector
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's better to avoid driving until this issue is resolved, as it can affect engine performance and emissions.
Will the code come back after I clear it?
If the fault is not fixed, the code is likely to return after some driving.
Why does this code pair with SPN 727?
Both codes relate to exhaust gas temperature sensors, indicating problems in the same monitoring system.
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