A/C Refrigerant Pressure Sensor Circuit High
The A/C refrigerant pressure sensor is reading too high, indicating a problem.
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What it means (plain English)
The A/C system has a sensor that measures the pressure of the refrigerant. If this pressure gets too high (usually over 300 psi), the sensor sends a signal to the computer that something's wrong.
What the computer is actually seeing
The vehicle's computer sees a higher-than-expected voltage from the A/C refrigerant pressure sensor, which indicates pressure is above normal limits.
What a healthy reading looks like
Normal refrigerant pressure readings should be between 30-35 psi on low side and up to 250-300 psi on 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.
- 11. Check A/C system refrigerant level. Add or remove refrigerant if necessary. If overcharged, rectify and retest.
- 22. Inspect the A/C refrigerant pressure sensor wiring and connector for damage or corrosion.
- 33. Use a scan tool to check real-time data for A/C refrigerant pressure sensor. Voltage should be 0.5 to 4.5 volts depending on pressure.
- 44. Test the A/C refrigerant pressure sensor with a multimeter to ensure correct resistance and response to pressure changes.
- 55. If the sensor tests out good, check for blockages in the A/C system, such as a clogged condenser.
Common causes
- Overcharged A/C system
- Faulty A/C refrigerant pressure sensor
- Blocked A/C system (e.g., condensor issues)
- Electrical issues in wiring/connectors
- Evaporator core problems
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with code B1412?
It's safe to drive, but A/C may not work properly and could lead to further damage if not fixed.
Will this code come back after clearing it?
It can come back if the underlying issue isn't fixed, like if the system is still overcharged.
Why do I see this code along with B1411?
B1411 relates to low refrigerant pressure, while B1412 is for high pressure; both indicate issues with the A/C system.
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