Passenger Compartment Temperature Sensor Circuit High
The passenger compartment temperature sensor is sending a high voltage signal.
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What it means (plain English)
The sensor that measures the temperature inside the vehicle is reporting a voltage higher than normal, which could point to a fault with the sensor or its wiring.
What the computer is actually seeing
The computer monitors the voltage from the passenger compartment temperature sensor, which should normally be between 0.5V to 4.5V. A value above 4.5V triggers this fault code.
What a healthy reading looks like
Normal operating voltage for the sensor should be between 0.5V (cold) and 4.5V (hot).
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 connector of the passenger compartment temperature sensor for any visible damage or corrosion.
- 22. Verify proper connector fit; reseat the connector if necessary.
- 33. Measure the voltage at the sensor connector while the vehicle is running. It should read between 0.5V and 4.5V depending on cabin temperature. If it's higher than 4.5V, go to step 4.
- 44. Replace the passenger compartment temperature sensor to see if that resolves the issue, then retest the system.
Common causes
- Faulty passenger compartment temperature sensor
- Wiring issues to the sensor (frayed, shorted, or open circuits)
- Connector problems (corroded or loose connections)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
Yes, but the HVAC system may not function properly.
Will the code come back after I reset it?
It can come back if the underlying issue (sensor or wiring) isn't fixed.
Why does this code appear with other codes?
Multiple faults can occur if there is a common wiring issue or if the system is trying to compensate for a malfunctioning sensor.
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