Exhaust Gas Temperature Sensor 1 (EGT1) Circuit High
The EGT sensor 1 circuit is reading a high voltage.
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What it means (plain English)
The exhaust gas temperature sensor is telling the computer that the temperature in the exhaust is too high, which could mean there's an issue with the sensor or the exhaust system itself.
What the computer is actually seeing
The ECM sees a voltage from the EGT sensor that exceeds the expected range, typically above 4.5 volts, indicating a potential fault in the sensor or wiring.
What a healthy reading looks like
EGT readings should be between 0.5V (low) and 4.5V (high), depending on exhaust temperature; for example, a temperature of 600°F might correspond to a 2V signal.
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.
- 1Check the exhaust gas temperature sensor connector for damage or corrosion.
- 2Inspect wiring for any signs of wear, fraying, or shorting.
- 3Test the exhaust gas temperature sensor using a multimeter; look for a resistance of about 5 ohms at room temperature in a healthy sensor.
- 4If wiring and sensor are good, check the EGT sensor signal with the engine running; it should fluctuate with temperature increases.
- 5If all testing points to the sensor being faulty, replace it and clear the code.
Common causes
- Faulty exhaust gas temperature sensor
- Damaged wiring or connector
- Short circuit in the EGT sensor circuit
- Incorrect installation of the EGT sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you should fix it soon. It could affect emissions and performance, so it's best not to ignore it.
What will happen if I don’t fix it?
Ignoring this code may lead to further damage in the exhaust system or affect the performance of your vehicle.
Why does this code appear with others?
It often pairs with other EGT codes (like SPN 2434) indicating multiple sensor issues or a problem within the system.
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