Powertrain, generic · Hybrid propulsion

P0D56 Proximity Detection Circuit A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0D56 is the general circuit fault of proximity detection circuit A, the line through which the vehicle notices that a charging plug sits in its inlet. Under SAE J1772 this proximity pin runs to protective earth through resistors in the plug and a switch tied to the latch button, so the car can block driving away and end charging before the plug is pulled; under IEC 62196 a resistor on the same pin also codes the cable's current rating. This is a different line from the control pilot, which carries the PWM dialogue with the charging station and has its own codes P0CF3-P0CF6. No manufacturer documents P0D56 publicly. A fault can mean no charging, or a car that thinks it is still plugged in.

Likely causes

Damaged or corroded proximity contact in the charge inlet
Open or chafed wire between charge inlet and evaluating module
Evaluation input in the charger or control module failed

Symptoms

  • Charging does not start although the cable is plugged in
  • Vehicle refuses to drive or shows the cable as connected without a plug
  • Charging system warning

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.5–3 h

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

Parts involved

proximity detection acharge inlet awiring harness

Related codes

P0D57P0D58P0D59P0D5AP2E87P0CF3

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