P0DBAHybrid/EV Battery Cell Balancing Circuit D Stuck Off
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0DBA: circuit D refuses to bleed. Toshiba's patent US20130026994A1 lists an open balancing terminal as one of the faults a monitoring chip should report, and this is the typical root of a stuck-off result. Because no charge is taken away from the high cells in group D, the pack's top end is governed by them; the charger and the controller stop earlier and the displayed range creeps down. The fault rarely causes a sudden breakdown. CARB 13 CCR 1968.2 requires balancing to stay functional. Ford uses P0DBA in its hybrid BECM (OBD summary 2015); the stuck-off decision comes from comparing the six cells of circuit D with the pack average at power-up, 75 mV being the limit. The always-on opposite is P0DB9, the overall verdict P0DAB.
- What you may notice
- MIL and battery warning
- Range slowly decreasing, charging finishing early
- Likely causes
- LikelyOpen balancing terminal or cell tap in group D
- PossibleBleed resistor of circuit D open
- RareBalancing transistor of circuit D failed open
- 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: €300 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.