P0DD6Hybrid/EV Battery Cell Balancing Circuit K 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
- P0DD6: group K's bleed path stays dead when balancing is called for. Ford includes it in its 2017 hybrid OBD summary; the BECM decides at power-up with open contactors, within 100 ms and over two power cycles, using the 75 mV deviation of one of the six cells from the average. LG's patent US20110285539A1 offers a direct check of the path: a sampling capacitor first takes on the cell's voltage and is then emptied through the balancing circuit; whatever voltage is left over must be close to zero, otherwise the circuit is faulty. Because nothing is drained, the car drives normally, but group K keeps reaching full charge first and the pack loses usable capacity. The stuck-on counterpart is P0DD5.
- What you may notice
- Check engine light while the car drives normally
- Group K highest at the end of charging
- Electric range decreasing over many charges
- Likely causes
- LikelyOpen bleed resistor in circuit K
- PossibleBalancing switch of group K failing to turn on
- RareCracked solder joint in the balancing path of K
- 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.