P0DD2Hybrid/EV Battery Cell Balancing Circuit J 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
- P0DD2 marks circuit J as unable to bleed: balancing is commanded, but the six cells of group J keep their charge. Ford lists the code in its 2015 hybrid OBD summary with the same power-up test as for the stuck-on case, run for 100 ms with the contactors still open, two consecutive power cycles and the 75 mV limit against the average cell voltage. GM's 2013 eAssist table documents a more direct test under its own code P1EAA: with the key off and the contactors open, a cell's balancing resistor is switched on and the cell voltage has to move by at least 0.1 V; two failed samples across key cycles give a Type A fault. Over many charges group J ends up high and caps the full charge. Opposite: P0DD1.
- What you may notice
- Check engine light without noticeable change in driving
- Cells of group J at the top of the cell list at the end of charging
- Usable battery capacity declining over time
- Likely causes
- LikelyBleed resistor of circuit J open or burnt
- PossibleBalancing switch of group J no longer closing
- RareInterrupted balancing lead between cell tap and board
- 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.