Exhaust Gas Temperature Sensor 1 Circuit High
The exhaust gas temperature sensor circuit is reading a high voltage level.
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What it means (plain English)
The exhaust gas temperature sensor measures how hot the exhaust is. If it sees very high voltage, it thinks the sensor is faulty or the wiring is shorted.
What the computer is actually seeing
The Engine Control Module (ECM) expects voltage between 0.5V and 4.5V from the sensor under normal conditions. A value above 4.5V means something is wrong.
What a healthy reading looks like
0.5V to 4.5V should be expected from the EGT sensor under normal operation.
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 visible damage or corrosion. If found, repair or replace as necessary. Decision: If wiring is okay, proceed to step 2.
- 22. Use a multimeter to check the voltage at the ECM connector for the EGT sensor. Key on, engine off, you should see 0.5V to 4.5V. Decision: If you measure over 4.5V, proceed to step 3. If within range, replace the sensor and retest.
- 33. Disconnect the EGT sensor and measure the resistance of the sensor itself. Compare to specs: usually around 10 ohms at room temperature. Decision: If out of spec, replace the sensor. If in spec, check ECM and update software if needed.
Common causes
- Shorted wiring in the EGT sensor circuit
- Faulty exhaust gas temperature sensor
- Loose or corroded connectors on the sensor
- Issues with the ECM software
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severities; you can drive, but fix as soon as possible to avoid damage to the exhaust system.
Will this code come back after clearing?
Yes, if the underlying issue isn't resolved, it will likely return.
Why do I see this code alongside other codes?
Multiple fault codes may indicate issues with the same system or due to a cascading failure in related components.
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