Air Conditioning System Refrigerant Pressure Sensor Circuit Range/Performance Problem
The refrigerant pressure sensor is out of its acceptable range.
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 air conditioning system is sensing too high or too low a refrigerant pressure which could keep it from working properly.
What the computer is actually seeing
The engine control unit (ECU) reads the refrigerant pressure sensor's voltage, which should be between approximately 0.5V (low pressure) and 4.5V (high pressure). If it falls outside this range, it triggers the fault code.
What a healthy reading looks like
Refrigerant pressure should be between 30-50 psi when the system is operating at normal conditions.
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.
- 1Check the refrigerant level; it should be between 30-50 psi when the system is running. If low, top off and test again.
- 2Inspect the refrigerant pressure sensor connector for corrosion or loose connections. Repair or replace as needed.
- 3Test the refrigerant pressure sensor with a multimeter; check for voltage output within 0.5V to 4.5V range. If out of range, replace the sensor.
- 4Inspect wiring from the sensor to the ECU for continuity. Use a multimeter to check for open or short circuits.
Common causes
- Low refrigerant level due to leaks
- Faulty refrigerant pressure sensor
- Wiring issues to the sensor
- Clogged expansion valve
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but the air conditioning system may not function properly, potentially making drives uncomfortable.
Will this code come back after a reset?
If the underlying issue isn't fixed (like leaks or faulty components), it likely will return.
Why do I see this code with other A/C codes?
Codes often group together when there are multiple issues affecting the A/C system, like sensor failures and pressure issues.
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 →