Air Conditioning Refrigerant Sensor Fault
The refrigerant level in the A/C system is too low or a sensor malfunction has occurred.
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 isn't getting enough refrigerant, which is a gas needed to cool the air inside your vehicle, or the sensor that measures the refrigerant level is bust.
What the computer is actually seeing
The Engine Control Unit (ECU) checks the refrigerant level through a sensor that should output a voltage between 0.5V (low level) and 4.5V (high level). If the voltage goes below 0.5V or above 4.5V, an error is triggered.
What a healthy reading looks like
Refrigerant pressure should be around 30-45 psi on low side at idle. The A/C sensor should provide a voltage from 0.5V to 4.5V based on refrigerant levels.
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 refrigerant level in the A/C system. If low, recharge it and see if the code clears.
- 22. Inspect the A/C refrigerant sensor wiring and connector. Look for any visible damage or corrosion.
- 33. Test the A/C refrigerant sensor with a multimeter. Check output voltage while monitoring refrigerant level changes. It should range from 0.5V to 4.5V. If it doesn't, replace the sensor.
- 44. Check the A/C pressure switch to ensure it's functioning properly and that there are no system leaks.
Common causes
- Low refrigerant level
- Faulty A/C refrigerant sensor
- Wiring issues or connector faults
- Leaks in the A/C system
Typical repair cost
$$$ (200-600)
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, you can drive, but the A/C won't work properly until fixed.
Will this problem come back after fixing?
If the root cause (like a leak) isn't resolved, it can return.
Why does this code show up with other codes?
Codes can indicate multiple issues in the A/C system, often related to refrigerant pressure or sensor failures.
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