Exhaust Gas Temperature Sensor Circuit High
The exhaust gas temperature sensor circuit is reporting a high signal.
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What it means (plain English)
The sensor that measures how hot the exhaust is is sending a signal that's too high, which could mean the sensor is failing or there's a wiring issue.
What the computer is actually seeing
The ECM sees a voltage from the exhaust gas temperature sensor that exceeds the expected maximum limit, typically above 4.5 volts.
What a healthy reading looks like
Exhaust gas temperature signals should typically range between 0.5 to 4.5 volts, depending on the sensor location and conditions.
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 connectors for the exhaust gas temperature sensor for any damage or corrosion and repair as necessary. Decision: If wiring is good, proceed to step 2.
- 22. Check the exhaust gas temperature sensor with a multimeter. Disconnect the sensor and measure the voltage with the ignition on. Decision: If voltage is above 4.5 volts, replace the sensor. If within 0.5 to 4.5 volts, check further.
- 33. If the sensor is replaced and the code returns, check for exhaust leaks upstream of the sensor. Repair any leaks found. Decision: If exhaust leaks are found and repaired, clear codes and retest. If the code does not return, job done. If it does, investigate ECM signal path.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues (short circuit, damaged insulation)
- Poor connections at the sensor or ECM
- Exhaust leaks affecting sensor readings
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
Yes, but it’s best to fix it soon to avoid potential damage or reduced engine performance.
Will this code come back after I clear it?
If the underlying issue is not resolved (like a bad sensor or wiring), it will likely return.
Why does this code appear with SPN 2263?
SPN 2263 is a related code for a lower exhaust temperature reading, indicating multiple temperature sensors could be having issues.
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