Powertrain, generic · Hybrid propulsion

P0D16 Battery Charging System A High Voltage Interlock Circuit Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0D16 flags a charging interlock loop that delivers a signal, just not the one expected – for example a reading that fails to follow when the module switches its test source on and off. No manufacturer documents P0D16 publicly. GM's Chevrolet Volt and Cadillac ELR show how such a loop is checked: the module feeds 5 V into the charging HVIL and compares the sensed level, as a share of the reference, against limits with the source on and off, which leads to P0D17 or P0D18. A Ford patent explains interlock loops built from shorting bars in connectors. Contact resistance in a connector, a plug inserted only partway and corrosion are typical. Open loops are P0D15, sporadic faults P0D19, the drive-side counterpart P0A0B. Charging is usually blocked.

Likely causes

Contact resistance or corrosion in an interlock connector
HV connector in the charging path inserted only partway
Fault in the module's interlock source or measuring stage

Symptoms

  • Charging refused
  • 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

bcs a hv interlockwiring harnesson board charger

Related codes

P0D15P0D17P0D18P0D19P0A0B

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