Exhaust Gas Temperature Sensor 3 Circuit Low
The EGT sensor for the third measurement point is reporting a low voltage.
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What it means (plain English)
The exhaust gas temperature sensor (EGT) measures how hot the exhaust gases are. If it's showing a low reading, it means it's either broken or not getting enough voltage to work properly.
What the computer is actually seeing
The engine control module (ECM) sees a voltage below 0.1 volts from the EGT sensor 3 signal circuit, indicating an abnormal low condition compared to normal operating parameters.
What a healthy reading looks like
EGT sensor output should typically be between 0.5V to 2.5V depending on exhaust temperature ranging from 200°C to 900°C (392°F to 1652°F).
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 EGT sensor 3. Look for fraying, corrosion, or broken wires. If found, repair.
- 22. Measure the voltage at the EGT sensor connector while the engine is running. If voltage is below 0.1V, proceed to the next step.
- 33. Disconnect the EGT sensor and measure the resistance between the sensor terminals. Compare the reading to the manufacturer specifications (typically around 1000 ohms). If out of range, replace the sensor.
- 44. Check the connector and wiring continuity back to the ECM. If continuity is lost, fix the wiring harness. If okay, check the signal wire at the ECM for proper input voltage.
- 55. If all checks pass and the issue persists, consider replacing the ECM as a last resort.
Common causes
- Wiring issues or shorts in the EGT sensor circuit
- Faulty EGT sensor
- Corrosion or poor connection in the connector
- Engine control module (ECM) failure
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you can drive, but it may affect performance or emissions. Fix soon.
Will this code come back after reset?
If the underlying issue isn't fixed, yes, it will return.
Why does this code appear with related codes?
They often trigger together due to common circuit issues or related sensor failures.
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