P0DB0Hybrid/EV Battery Cell Balancing Circuit B
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0DB0 flags an electrical defect in the second balancing circuit, B. The battery controller finds an open, short or implausible voltage on the switch, resistor or lead serving that cell group, independent of whether balancing would be needed right now. One way to test this hardware is shown in LG Chem's patent US20110285539A1: a floating capacitor is charged to the cell voltage and then drained via the bleed path, and a high leftover voltage marks the circuit as faulty. CARB 13 CCR 1968.2 requires functional monitoring of these parts on hybrids. Audi lists P0DB000 in bulletin 2046556, written for the 2016 A3 e-tron, next to the other circuit codes; there it came with intermittent charging refusal and was fixed by software for J840 and JX1.
- What you may notice
- Battery system warning and MIL
- Electric drive or assistance possibly limited
- Likely causes
- LikelyDamaged balancing/sense lead or connector of cell group B
- PossibleCell monitoring chip or controller of group B defective
- RareShort 12 V supply dropout during service work
- 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.