P0DD6 code meaning
Hybrid/EV Battery Cell Balancing Circuit K Stuck Off
Powertrain system Generic code P0Dxx codes Check engine light
What P0DD6 means
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.
P0DD6 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor1.5 to 8 hours
- Clears after repairAfter a drive cycle
Symptoms of P0DD6
- Check engine light while the car drives normally
- Group K highest at the end of charging
- Electric range decreasing over many charges
Common causes of P0DD6
- Most likelyOpen bleed resistor in circuit K
- PossibleBalancing switch of group K failing to turn on
- Less likelyCracked solder joint in the balancing path of K
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery cell balancing circuit kBms
What each part of P0DD6 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| D6 | The exact fault in that area. |
What to do next
- Note P0DD6 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0DD6
What does P0DD6 mean?
P0DD6 means "Hybrid/EV Battery Cell Balancing Circuit K Stuck Off". P0DD6: group K's bleed path stays dead when balancing is called for. It is a generic code, so it means the same on every make.
Is it safe to drive with P0DD6?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0DD6 fail an emissions test?
Yes, it can. P0DD6 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0DD6 to fix?
Difficulty: workshop only. A typical repair takes 1.5 to 8 hours of work. This is a job for a workshop.
Will P0DD6 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.