P0DCBHybrid/EV Battery Cell Balancing Circuit H Range/Performance
- 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
- P0DCB is raised when circuit H works electrically but the result of a balancing run does not match the plan. Ford's patent US9145064B2 shows how such a plan can be made: from each cell's capacity surplus and the pack charge current the controller computes how long that cell's resistor must stay active during charging so that all cells reach the target together. If group H still stands apart when that time has passed, the outcome is implausible, whether because of a resistor that drifted, a cell whose capacity changed or wrong estimates. A public maker document for P0DCB was not found; Volvo cures the F counterpart P0DC3 with BECM software. The CARB requirement is that intended cell voltages be maintained. Circuit fault: P0DC8.
- What you may notice
- Check engine light, often only after charging sessions
- Group H remains out of line after a full charge
- Fluctuating range estimate
- Likely causes
- PossibleWrong capacity or state-of-charge estimate for the cells of group H
- PossibleBattery controller software (update first, as Volvo does for P0DC3)
- RareBleed resistor of H drifted from its nominal value
- 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: €80 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.