P0DB8Hybrid/EV Battery Cell Balancing Circuit D
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- MIL and battery system message
- Possible limitation of electric power
- Likely causes
- LikelyOpen balancing terminal or lead in group D
- PossibleShort between neighbouring sense/balancing lines
- RareMonitoring chip of group D defective
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.