Air Conditioning Pressure Sensor Fault
The air conditioning pressure sensor has detected an abnormal pressure reading.
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What it means (plain English)
The air conditioning pressure sensor measures the refrigerant pressure; if it's too low or high, the system can't work properly.
What the computer is actually seeing
The ECM detects that the signal from the pressure sensor is outside the normal range, typically below 20 psi or above 400 psi for at least 10 seconds.
What a healthy reading looks like
Normal operating pressure for the A/C system should be around 30-45 psi on the low side and 200-250 psi on the high side during operation.
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 refrigerant level; it should be within the specified range.
- 2Inspect the wiring and connectors at the A/C pressure sensor for damage or corrosion.
- 3Use a scan tool to monitor real-time data from the A/C pressure sensor; look for stable readings during operation.
- 4Evacuate and recharge the A/C system to the manufacturer's recommended level if low pressure is suspected.
- 5If pressure readings are still out of range after recharging, replace the A/C pressure sensor.
Common causes
- Faulty A/C pressure sensor
- Refrigerant leak
- Blocked orifice tube
- Compressor failure
- Wiring issues in the sensor circuit
Typical repair cost
$$
Related codes
Frequently asked questions
Why does this code sometimes pair with other codes?
Other codes can indicate related issues in the A/C system, like refrigerant problems or sensor failures.
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