Exhaust Gas Temperature Sensor Circuit Low
The exhaust gas temperature sensor is reporting a low voltage condition.
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What it means (plain English)
The exhaust gas temperature sensor measures the temperature of the exhaust gases. If it sends a voltage that is too low (below about 0.3 volts), the computer thinks there's a problem—either the sensor is bad or there's an issue in the wiring.
What the computer is actually seeing
The engine control module (ECM) expects the exhaust gas temperature (EGT) sensor to produce a voltage between 0.5 and 4.5 volts depending on the temperature range. A reading below 0.3 volts signals an issue.
What a healthy reading looks like
0.5 to 4.5 volts depending on exhaust temperature (around 300°C to 800°C corresponding to about 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 exhaust gas temperature sensor connector for damage or corrosion. If damaged, repair or replace the connector. Decide if repair fixed the code.
- 22. Measure the voltage at the exhaust gas temperature sensor with the engine running. If voltage is below 0.3 volts, proceed to step 3. If voltage is within range, the sensor may be faulty or there may be an issue with the ECM.
- 33. Check the wiring between the sensor and the ECM for shorts, opens, or damaged sections. Use a multimeter to test for continuity. If there is damage, repair it and retest.
- 44. If wiring is good, replace the exhaust gas temperature sensor and clear the code. Monitor for reoccurrence.
Common causes
- Faulty exhaust gas temperature sensor
- Damaged wiring or connectors to the sensor
- Poor electrical connections at the sensor or ECM
- Open or short circuits in the sensor circuit
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but you should address it soon as it could affect emissions and performance.
Will this issue come back after clearing?
If the sensor or wiring isn't fixed, it will likely come back.
Why does this code sometimes pair with others?
It can indicate a larger issue in the exhaust system, especially if multiple sensors are involved.
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