Powertrain, generic · Hybrid propulsion

P0D26 Battery Charger System Precharge Time Too Long

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0D26 means the charger's high-voltage bus did not come up to battery voltage within the allowed precharge time. GM's Volt 2011 to 2015 and ELR 2014 to 2016 require the bus to sit within 5 % of pack voltage for 0.25 s before 10 s have passed; the 2016 and 2017 Volt allow only 0.700 s to reach 95 % (later 95 to 105 %); all are One Trip Type A. Mitsubishi's Outlander PHEV looks at the charger's own capacitor, which must charge to 120 or 240 V within 45 s, otherwise charging stops. Bulletin PIP4905E links P0D26 on the Volt and ELR to no charging and asks for HPCM2 software, then a check of the proximity signal and charge port for water or corrosion; on the Bolt EV (18-NA-225) it comes with P0C78 when the fuse in the manual disconnect has opened. The main battery precharge is P0C78.

Likely causes

Open precharge resistor, fuse or contactor in the precharge path
Blown fuse in the manual service disconnect (Bolt EV bulletin)
Erratic proximity signal from a wet or corroded charge port
Outdated hybrid control module software

Symptoms

  • Vehicle does not charge on 120 V or 240 V
  • MIL on at once
  • With a blown disconnect fuse, loss of propulsion

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€0–2,500
Time0.5–5 h

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

Parts involved

battery charger precharge circuitdc link capacitor

Related codes

P0D25P0C78P0D23

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