Powertrain, generic (extended)

P2CBD PCV Heater B Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Heating element B burnt out
Corroded or loose connector at heater B
Broken control or supply wire
Faulty output stage in the engine control module

Symptoms

  • 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

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–180
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

pcv heater bwiring harnessecm

Related codes

P2CBEP2CBFP2CC0P053A

References: gsi.ext.gm.com, saabwisonline.com, patents.google.com, law.cornell.edu.