Powertrain, generic · Hybrid propulsion

P0D19 Battery Charging System A High Voltage Interlock Circuit Intermittent/Erratic

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0D19 covers a charging interlock loop that drops out and comes back, so the signal flips between valid and invalid within a short time. Loose terminals, a connector that is not fully latched, a chafing wire that only touches over bumps and vibration-sensitive solder joints are typical causes. No manufacturer documents P0D19 publicly. GM's Volt and ELR tables show the checks applied to the same loop, namely low and high limits on the sensed share of a 5 V reference, and a Ford patent explains why intermittent interlock contacts matter and how a loop can be arranged so a brief interruption does not cut propulsion. CARB requires plug-in vehicles to monitor charging components. Steady faults are P0D15–P0D18, the drive interlock intermittent code is P0A0E. Charging may stop without warning.

Likely causes

Loose or spread terminal in an interlock connector
HV connector in the charging path not fully latched
Chafed interlock wire making contact only under vibration

Symptoms

  • Charging stops unexpectedly
  • Intermittent charging system warning

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.5–4 h

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

Parts involved

bcs a hv interlockwiring harnesson board charger

Related codes

P0D15P0D16P0D17P0D18P0A0E

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