P0DDAHybrid/EV Battery Cell Balancing Circuit L 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
- P0DDA says circuit L does not discharge when it is told to. In Ford's 2019 hybrid OBD summary the start-up test has been simplified: it still runs for 100 ms before the contactors close, but the requirement of two consecutive power cycles is gone, and the 75 mV deviation of a cell from the average must instead persist for 0.1 s. Ford's 2014 code list flags the code for the MIL. Renesas patent US9735567B2 explains why a switch that never closes can be seen electrically: a pull-up lifts the balancing pin to cell potential, so a switch that is told to close while the pin still shows the full cell voltage means the path is open. Group L then lags behind in every balancing run and limits the charge. Opposite case: P0DD9.
- What you may notice
- Check engine light with no change in drivability
- Group L reaches full charge before the rest
- Gradual loss of usable capacity
- Likely causes
- LikelyBalancing switch of group L stays open when commanded on
- PossibleBleed resistor of circuit L open
- RareMissing gate drive for the balancing switch of L
- 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 – €4,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.