Cabin Temperature Sensor Circuit High
The cabin temperature sensor signal is too high.
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What it means (plain English)
The computer thinks the temperature inside the cab is too high because the cabin temperature sensor is sending a signal that's higher than expected.
What the computer is actually seeing
The Engine Control Module (ECM) reads a voltage from the cabin temperature sensor, typically around 0.5V to 4.5V. A value above this range indicates a problem.
What a healthy reading looks like
Expected voltage from the cabin temperature sensor should be between 0.5V (low temp) and 4.5V (high temp) at room temperature, around 2V to 3V is typical at a comfortable temperature.
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 cabin temperature sensor wiring for any damage or corrosion.
- 22. Check the connector for the cabin temperature sensor for any bent pins or loose connections.
- 33. Using a multimeter, measure the voltage output of the cabin temperature sensor. It should read between 0.5V and 4.5V under normal conditions.
- 44. If the voltage is out of range or the wiring is good, replace the cabin temperature sensor.
- 55. Clear the fault code and monitor for any reoccurrence.
Common causes
- Shorted cabin temperature sensor
- Wiring issues (frayed, short, or corroded wires)
- Faulty ECM or sensor malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this fault code?
Yes, it is drivable, but fix it soon to avoid discomfort.
Will this fault come back after fixing?
If the sensor and wiring are properly repaired, the code should not return.
Why does this code appear with other codes?
It often pairs with other cabin-related codes indicating a broader issue.
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