Powertrain, generic · Hybrid propulsion

P0CD3 Charge Port Door A Unlock Control Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0CD3 narrows the unlock output fault of charge flap A down to a low level: the monitored voltage on the actuator or relay control line stays near ground when it should be higher, which typically means a short to ground on the control wire or a failed actuator coil pulling the line down. No manufacturer documents this code publicly. GM's Volt tables of 2011 and 2012 fold the short to ground into the combined circuit code P0CD1 instead of using P0CD3. CARB 13 CCR 1968.2 (e)(15) asks for circuit checks on outputs only where emissions or other diagnostics depend on them. The GM charge port patent illustrates the actuator that this output powers. The high-side case is P0CD4, the functional test P0CD2. A driver usually finds that the flap no longer releases, and a blown fuse is possible.

Likely causes

Actuator control wire shorted to ground
Shorted winding in the unlock actuator
Water in the actuator connector

Symptoms

  • Charge flap does not unlock
  • Possibly blown fuse in the actuator supply

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–500
Time0.5–2.5 h

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

Parts involved

charge port door a unlock actuatorwiring harnesshybrid control module

Related codes

P0CD1P0CD2P0CD4P2E9F

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