A/C Refrigerant Pressure Sensor Fault
A problem with the A/C refrigerant pressure sensor has been detected.
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 pressure sensor monitors the pressure of the refrigerant in the system. If it senses that the pressure is too high or too low, or if there's a problem with its signal, it throws this code.
What the computer is actually seeing
The engine control unit (ECU) expects to see a voltage signal from the pressure sensor that varies with refrigerant pressure, typically between 0.5V (low pressure) and 4.5V (high pressure).
What a healthy reading looks like
Voltage should range from 0.5V to 4.5V, with specific pressure readings correlating to those voltages based on your vehicle's A/C system specifications.
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. Add refrigerant if low (should be between specified min and max).
- 22. Inspect the wiring and connector at the A/C refrigerant pressure sensor for damage or corrosion. Repair as needed.
- 33. Measure the voltage at the sensor connector with the A/C running. It should be between 0.5V and 4.5V.
- 4 a. If out of range, replace the sensor.
- 5 b. If within range, check for clogged components or further electrical issues.
Common causes
- Bad A/C refrigerant pressure sensor
- Wiring issues (shorts or opens) in the sensor circuit
- Low refrigerant level
- Clogged A/C system components (e.g. condenser, expansion valve)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but the A/C may not work properly, and it’s best to get it fixed soon.
Will this issue happen again after repair?
If the root cause is fixed (like wiring), it shouldn’t come back.
Why does this code pair with other A/C related codes?
They all relate to the A/C system functionality and pressure readings.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →