Powertrain
generic / SAE
P2518
A/C Refrigerant Pressure Sensor B Circuit High
A/C refrigerant pressure sensor B signal voltage reads above the upper limit. Typically a short to reference voltage in the signal line, an open signal return, or an overpressure event briefly pegging the sensor. ECM disables variable compressor control to protect the system.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 18
Possible causes
- Signal wire shorted to reference voltage high
- Open signal return at the sensor medium
- Connector pins corroded - high contact resistance low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–400 €
- Estimated time: 0.4–1.5 h
- Component: ac pressure sensor b
- Component: sensor wiring
- MIL / check engine light
Sources
References
sae:J2012