Engine Exhaust Temperature - Exceeds Limit
The engine exhaust temperature is too high.
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What it means (plain English)
The exhaust temperature sensor is reading higher than normal levels, indicating potential overheating of the exhaust system, which could damage components.
What the computer is actually seeing
The ECM monitors the exhaust temperature, expecting values typically below 900°F (482°C) under normal operating conditions.
What a healthy reading looks like
Normal exhaust temperature should range from 300°F to 600°F (149°C to 316°C) during operation, exceeding 900°F (482°C) triggers this 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.
- 11. Inspect the exhaust temperature sensor wiring for frays, breaks, or corrosion. If damaged, repair or replace the wiring. Decision: Is wiring intact? Yes: Proceed. No: Repair wiring.
- 22. Check the exhaust temperature sensor connector for corrosion or looseness. Clean or secure the connector if necessary. Decision: Is the connector secure and clean? Yes: Proceed. No: Repair connector.
- 33. Use a scan tool to read the current exhaust temperature sensor value while the engine is running. Compare it with the expected values (300°F to 600°F). Decision: Is the reading within the normal range? Yes: Possible internal engine issue; further diagnostics needed. No: Replace the exhaust temperature sensor.
- 44. Inspect the exhaust system for any restrictions or blockages (damaged catalytic converter, muffler issues). Decision: Are there blockages present? Yes: Repair or replace the affected components. No: Replace the exhaust temperature sensor.
Common causes
- Faulty exhaust temperature sensor
- Wiring issues in the sensor circuit
- Exhaust system blockage or restriction
- Excessive fuel being burned (e.g., due to rich conditions)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended; high exhaust temperatures can cause damage and increase emissions.
Will this code come back after clearing it?
If the underlying issue isn't fixed, it will likely return.
Why does this code sometimes pair with exhaust system codes?
Overheating can be caused by exhaust flow issues, often leading to additional codes related to the exhaust system.
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