Exhaust Gas Temperature Out of Range - Bank 1
The exhaust gas temperature sensor on bank 1 is reporting values outside the expected range.
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What it means (plain English)
The temperature of the exhaust gases is too high or too low for what the system expects, which can indicate a potential problem with the engine or exhaust system.
What the computer is actually seeing
The engine control module (ECM) receives signals from the exhaust gas temperature (EGT) sensor on bank 1. These signals should generally be between 300°F to 1,500°F (150°C to 800°C) under normal operating conditions. If readings exceed 1,500°F (800°C) or fall below 300°F (150°C), it triggers the SPN 6375 fault code.
What a healthy reading looks like
Expected values for the exhaust gas temperature sensor should be approximately 300°F to 1,500°F (150°C to 800°C) during 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 exhaust gas temperature sensor wiring and connectors for damage, corrosion, or loose connections. Fix any issues found. Decision: If no issues, proceed to step 2.
- 22. Check the resistance of the exhaust gas temperature sensor. It should be within the manufacturer's specified range, usually around 10-40 ohms at room temperature. Decision: If out of range, replace the sensor. If within range, proceed to step 3.
- 33. Start the engine and monitor the exhaust gas temperature with a scan tool. Compare the live data to expected temperature readings. Decision: If readings are within range and stable, issue may be intermittent. If they are outside normal range, further investigation is needed.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues or bad connection to the sensor
- Exhaust leak causing incorrect readings
- Engine running too rich or lean affecting exhaust temperatures
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
While it may be drivable, it's best to address this code soon to prevent further damage to the engine or exhaust system.
Will this code come back after clearing it?
If the underlying issue isn't resolved, the code will likely return.
Why does this code appear with others like SPN 6376?
Codes often appear together due to related issues, such as sensor failure or wiring problems affecting multiple sensors.
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