A/C Refrigerant Pressure Sensor B Circuit
General electrical fault in the second A/C refrigerant pressure sensor circuit. Sensor B usually monitors the low-side or compressor-suction pressure (in addition to high-side sensor A). The ECM cannot read a plausible value and disables variable compressor control to avoid evaporator freeze-up or overpressure.
Affected components
- Ac pressure sensor b
- Sensor wiring
Common causes
- High likelihood: Open or shorted wiring to the sensor
- Medium likelihood: Failed sensor element
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.