P05E2A/C Refrigerant Pressure Sensor B Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- How the car detects it
- The refrigerant pressure sensor (three wires, 5 V reference, signal rising with pressure) tells the engine module the A/C pressure; it uses it to switch the radiator fan, to block the compressor at too high or too low pressure and to pre-control idle load. CARB requires such inputs to be checked for circuit faults and plausibility, but they need not light the lamp if they do not affect emissions. 'Intermittent/Erratic' means the signal jumps implausibly fast or briefly leaves its valid range without staying low or high long enough for those codes. Sensor B is a second pressure sensor; which one depends on the maker – typically the low-pressure side or a second circuit in heat pump systems. Its other codes are P2515–P2518. No manufacturer document available to us uses P05E2, so this follows the sensor A family. Expect the A/C or heat pump to switch off intermittently.
- What you may notice
- A/C or heat pump intermittently switched off
- Heating or cooling output fluctuates
- Warning lamp depending on the maker
- Likely causes
- LikelyLoose contact or corrosion at the sensor B connector
- PossibleChafed or broken harness
- PossibleSensor B faulty
- Rare5 V reference or control module
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.