Powertrain, generic · Hybrid propulsion

P0D17 Battery Charging System A High Voltage Interlock Circuit Low

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0D17 means the sensed voltage of the charging HVIL loop is too low. GM documents the check for the Chevrolet Volt (2011, 2014) and the Cadillac ELR: while the module sources 5 V into the loop, a sensed value under 30 % of the reference in two samples out of two at 12.5 ms sets the code as Type A, with the MIL on after one trip. A low reading suggests a path to ground or leakage somewhere in the loop wiring, or a fault in the measuring stage of the module. Because the test only runs with the source switched on, it typically shows up around charging. The interlock of battery and drive has its own code, P0A0C. P0D18 is the high counterpart, P0D15 the open loop. With an implausible loop the car refuses to charge.

Likely causes

Interlock wire chafed and touching ground
Moisture or dirt in an interlock connector causing leakage
Fault in the interlock source or measuring circuit of the control module

Symptoms

  • Malfunction indicator lamp after one trip (GM Type A)
  • Charging refused

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 harnesshybrid control module

Related codes

P0D15P0D16P0D18P0D19P0A0C

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