Exhaust Gas Temperature Sensor Circuit High
The exhaust gas temperature (EGT) sensor is reading a voltage higher than expected.
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What it means (plain English)
There's a sensor measuring the temperature of the exhaust gases, and it’s sending a signal that says the temperature is way too high, which likely means the sensor or wiring is faulty.
What the computer is actually seeing
The Engine Control Module (ECM) sees a voltage from the EGT sensor exceeding its normal operating range, typically over 5 volts when it should be between 0.5 to 4.5 volts for normal operation.
What a healthy reading looks like
EGT should typically read between 300 to 900 degrees Fahrenheit depending on engine load and operation; voltage from the EGT sensor should be 0.5 to 4.5 volts.
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 to the EGT sensor. Look for fraying, corrosion, or loose connections. If damaged, repair or replace as necessary. Decision: Is the wiring good? If yes, proceed to step 2. If no, fix wiring and retest.
- 22. Check the sensor resistance with a multimeter. Expected resistance is typically around 10 to 50 ohms at room temperature. Decision: Is resistance within range? If yes, replace the sensor. If no, replace the wiring harness leading to the sensor and retest.
- 33. Verify exhaust system integrity. Look for any exhaust leaks upstream of the sensor that could cause erroneous readings. Decision: Is exhaust system intact? If yes, replace the EGT sensor. If no, repair the leaks and retest.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues or corroded connectors
- Exhaust leaks affecting sensor performance
- Short circuit in the sensor circuit
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive the vehicle, as it could lead to further engine damage and emissions system problems.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code show up with other related codes?
Often, multiple codes can be triggered due to shared wiring or related faults within the exhaust temperature monitoring system.
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