P2CBDPCV Heater B Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Some engines heat the crankcase ventilation path so that moisture and oil carried by blow-by gas cannot freeze and block it; engines with two such paths, for example a PCV line and a separate make-up air line feeding the turbo intake, may carry a second heater, B. P2CBD reports that the control circuit of heater B is open, so the element never receives current. No manufacturer documents P2CBD publicly. For heater A (P053A), GM's 2016 diesels check the driver pin with 20 failures in 40 samples below 90 °C coolant as Type C, without lamp, while the Saab 9-5 2.0 diesel treats the same fault as Type A. A broken wire, corroded connector or burnt-out element are usual; only frost reveals the effect.
- What you may notice
- MIL on (depending on manufacturer) or code stored only
- No noticeable effect in mild weather
- In hard frost, iced ventilation path with oil leaks or rough idle
- Likely causes
- LikelyHeating element B burnt out
- PossibleCorroded or loose connector at heater B
- PossibleBroken control or supply wire
- RareFaulty 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
- Easy · Often possible to do yourself.Typical cost: €20 – €180
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.