Powertrain, generic (extended)

P2DCF Control Pilot Charging Switch B Range/Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2DCF means charging switch B responds electrically, but the pilot level it creates is not plausible. The only public description of such a test concerns switch A: in a GM check for the Chevrolet Volt, run only while no cable is inserted, the module shuts its internal test switch and the charging switch simultaneously, and the pilot-to-battery voltage ratio then has to lie from 0.14 to 0.28; 30 failures in 50 samples taken every 100 ms set P0CF9 as Type A. An equivalent check of switch B would catch a drifted resistor, a switch with high contact resistance or a fault where the module measures the pilot. No manufacturer documents P2DCF publicly; the MIL depends on how the maker classifies it. Circuit faults: P2DCE, P2DD0, P2DD1. Charging may be refused or stop.

Likely causes

Resistor in the switch B branch drifted out of tolerance
High contact resistance in switch, inlet or connector
Fault in the pilot voltage measuring path of the charging module

Symptoms

  • Charging refused or stopping after a short time
  • Charging error message

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–1,200
Time0.5–3 h

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

Parts involved

control pilot switch bwiring harnesson board charger

Related codes

P2DCEP2DD0P2DD1P2DD2P0CF9P0CF4

References: gsi.ext.gm.com, en.wikipedia.org, law.cornell.edu.