A/C Refrigerant Pressure Sensor Circuit Low
The A/C refrigerant pressure sensor is reading too low.
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What it means (plain English)
The computer thinks the pressure in the A/C system is too low, which can stop the A/C from working properly.
What the computer is actually seeing
The A/C control module expects the refrigerant pressure to be within a specific range (usually between 25-45 psi when the A/C is on).
What a healthy reading looks like
Pressure should be between 25 psi and 45 psi when A/C is running. Below this range indicates a problem.
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 using proper gauges. Confirm it's within expected range (25-45 psi). Decision: If low, recharge system and retest (may need to check for leaks).
- 22. Inspect the A/C refrigerant pressure sensor wiring and connectors for damage or corrosion. Decision: Repair or replace faulty wiring/connectors as needed.
- 33. Test the A/C refrigerant pressure sensor's output voltage. It should vary between 0.5V and 4.5V depending on pressure. Decision: If the voltage is outside this range, replace the sensor.
- 44. Clear the code and perform a road test with A/C running. Verify that the code does not return.
Common causes
- Low refrigerant level due to leaks
- Faulty A/C refrigerant pressure sensor
- Wiring or connector issues in the A/C pressure sensor circuit
- Clogged A/C system components
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but A/C may not work properly and you should address it soon.
Will this code come back after clearing?
If the underlying issue isn't fixed, it likely will return.
Why does this code show up when the A/C is off?
It could indicate a sensor fault or wiring issue even when the A/C isn't operating.
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