Exhaust Gas Temperature Sensor Circuit Low
This code indicates an issue with the exhaust gas temperature sensor circuit being too low.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The exhaust gas temperature sensor measures how hot the gases coming out of the engine are. If it says it's cooler than it should be, there might be a problem with the sensor or its connections.
What the computer is actually seeing
The engine control module (ECM) sees a low voltage signal from the exhaust gas temperature (EGT) sensor, typically around 0.2V when it should be around 1.5V under normal operating conditions.
What a healthy reading looks like
Normal sensor voltage range should be between 1.0V and 3.0V based on the exhaust temperature; below 0.5V triggers the code.
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 wiring for damage or shorts. Use a multimeter to check continuity.
- 2Inspect the sensor connector for corrosion or poor connection. Clean if necessary and retest.
- 3Measure the voltage at the sensor while the engine is running; expect around 1.5V at normal operating temperature. If low, proceed to the next step.
- 4If the sensor voltage is low or unstable, replace the exhaust gas temperature sensor. If voltage is normal, check the ECM for faults.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues in the sensor circuit
- Bad connector or poor connection
- Short circuit to ground
- Open circuit due to broken wire
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but monitor performance. Ignoring it long term can lead to further issues.
Will this code clear on its own?
No, if the issue is not resolved, the code will reappear after clearing.
Why does this code appear with other codes?
It’s common for sensor issues to trigger multiple codes if they are related to the same system.
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