A/C Refrigerant Temperature Sensor Circuit/Open
This code indicates an issue with the A/C refrigerant temperature sensor circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The A/C system has a sensor that reads the temperature of the refrigerant. If there's an open in the circuit, the computer can't get a reading, which can affect A/C performance.
What the computer is actually seeing
The Engine Control Module (ECM) sees a voltage reading that is out of the normal range, indicating that the A/C refrigerant temperature sensor is not sending a signal or the circuit is open.
What a healthy reading looks like
Typically, the sensor should produce a voltage signal between 0.5V and 3.5V depending on refrigerant temperature; a reading outside this range indicates a fault.
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. Check the A/C refrigerant level; ensure it's within normal range.
- 22. Inspect the wiring and connector to the A/C refrigerant temperature sensor for damage or corrosion. Repair or replace as necessary.
- 33. Test the resistance of the refrigerant temperature sensor using a multimeter. Expected resistance should be within manufacturer specs based on the refrigerant temperature.
- 44. If the sensor is out of spec, replace it and clear the code. If the code returns, check the wiring continuity and for any short to ground or power.
Common causes
- Open circuit in the wiring
- Loose or corroded connector
- Faulty A/C refrigerant temperature sensor
- Blown fuse for the A/C system
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but A/C performance may be affected.
Will this code come back after repair?
If the underlying issues are fixed properly, the code should not return.
Why does this code sometimes appear with others?
It may pair with other A/C system codes due to shared wiring or system failures.
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