Engine Control Module - Internal Temperature Sensor Fault
The engine control module has detected a fault with its internal temperature sensor.
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What it means (plain English)
The engine's computer has an internal sensor that measures its temperature, and it's not working right, likely overheating.
What the computer is actually seeing
The ECM sees readings from its internal temperature sensor that are out of the expected range, indicating a malfunction or failure of the sensor.
What a healthy reading looks like
Internal temperature readings should typically be between 80°F to 215°F (27°C to 102°C) under normal operating conditions.
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 to the ECM for any signs of damage or corrosion. Repair as necessary. Decision point: Are the connections clean and undamaged? Yes: Go to step 2. No: Repair connections and retest.
- 22. Check for any recent updates or firmware issues with the ECM. Verify that the software is current. Decision point: Is the ECM updated to the latest software? Yes: Go to step 3. No: Update the ECM and retest.
- 33. Using a scan tool, read the internal temperature sensor data in live mode. Compare it with the expected values. Decision point: Is the reading within normal range? Yes: Further diagnose ECM. No: Replace the internal temperature sensor.
Common causes
- Faulty internal temperature sensor
- Wiring or connector issues
- ECM failure or internal fault
- Software glitches in the ECM firmware
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity, so it's best not to drive long distances. You may experience performance issues.
Will this fault come back after a reset?
If caused by a faulty sensor or wiring, it may return until those are repaired.
Why does this code appear along with others?
It's common for multiple codes to appear if the ECM is failing or if there are related sensor issues.
Working a real vehicle right now?
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