Powertrain, generic · Hybrid propulsion

P0DB8 Hybrid/EV Battery Cell Balancing Circuit D

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0DB8 is the circuit code for balancing channel D. Here the controller sees a hardware problem: the switch, resistor or cell tap of group D reports a state that cannot be valid, typically an open lead or a short to a neighbouring line. Toshiba's patent US20130026994A1 shows how a monitoring chip can tell which balancing terminal is open and pass that to the main controller, which then decides whether the module or the cell unit must be repaired. CARB 13 CCR 1968.2 calls for this monitoring on hybrids. Audi's bulletin 2046556 names P0DB800 for the 2016 A3 e-tron, where the car could also wrongly report a plugged-in charger; new software cured it.

Likely causes

Open balancing terminal or lead in group D
Short between neighbouring sense/balancing lines
Monitoring chip of group D defective

Symptoms

  • MIL and battery system message
  • Possible limitation of electric power

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–4,000
Time1–8 h

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

Parts involved

hv battery cell balancing circuit dbms

Related codes

P0DABP0DB9P0DBAP0DBBP0DB4P0DBC

References: law.cornell.edu, patents.google.com, static.nhtsa.gov.