Powertrain, generic · Hybrid propulsion

P0CD1 Charge Port Door A Unlock Control Circuit

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

P0CD1 is the circuit fault of the output that releases charge flap A, normally a relay or driver that briefly powers the latch actuator. A GM patent shows such an actuator retracting a post so the spring-loaded flap can pop open. On the 2011 to 2013 Chevrolet Volt the hybrid control module 2 relies on the fault status its driver reports and covers two cases: short to ground, judged while the unlock is commanded, and a short to 12 V or an open line, judged while it is not, using sample counts such as 64 of 80 at 50 ms. It is a Type B code with the lamp after two trips, and an active P0CD1 blocks the opening check P0CD2. Split low and high codes (P0CD3, P0CD4) are not used there. Result for the driver: the flap stays shut.

Likely causes

Unlock actuator coil open or shorted
Faulty charge flap relay or its control wire
Chafed or corroded wiring to the actuator
Output driver in the control module damaged

Symptoms

  • Charge flap does not unlock
  • Warning lamp after two trips (GM Volt)
  • Emergency release needed to reach the charge socket

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

P0CD2P0CD3P0CD4P0CCCP2E9D

References: gsi.ext.gm.com, gsi.ext.gm.com, patents.google.com.