P0DDFHybrid/EV Battery Cell Balancing Circuit M 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
- P0DDF covers group M when balancing responds but its outcome is not credible. No manufacturer publishes this code. Ford patent US9145064B2 shows what the expected outcome can be built on: the controller derives a bleed time per cell from that cell's surplus capacity and the charging current, so that all cells arrive at the target together at the end of charging. If group M is still out of line once its time is used up, the plan or the hardware behind it is off. Typical reasons are a capacity estimate that no longer matches an aged cell or a resistor that has drifted. The CARB hybrid rule in 13 CCR 1968.2 calls for exactly this functional check. Electrical fault of M: P0DDC.
- What you may notice
- Check engine light following charging sessions
- Group M not aligned with the rest after full charge
- Inconsistent range display
- Likely causes
- PossibleStored capacity value for cells of group M out of date
- PossibleBattery controller software (update before repair)
- RareBleed resistor of M drifted
- 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.