P2CBEPCV Heater B Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2CBE says the switched control line of PCV heater B carries too high a voltage, usually because it touches battery positive. Since the module normally completes the heater circuit by pulling this line to ground, a short to supply means the output can no longer switch the element on, or the driver shuts down to protect itself, so heater B stays cold. No manufacturer documents P2CBE publicly. GM checks the A-side equivalent P053C on 2016 diesels with the same 20-of-40 sample counter below 90 °C as its open and ground tests, Type C; the Saab 9-5 2.0 diesel looks for 3–4 V on the low reference with the connector unplugged. Look for chafed insulation near hot parts. Note that in the B group the High code comes before Low.
- What you may notice
- Code stored, MIL depending on manufacturer
- Heater B inactive, risk of an iced ventilation path in frost
- Likely causes
- LikelyControl wire chafed through and touching battery voltage
- PossibleMoisture bridging pins in the heater B connector
- RareInternal short in heating element B
- RareDamaged output stage in the engine control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.