P0DC8Hybrid/EV Battery Cell Balancing Circuit H
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0DC8 covers an electrical fault of balancing circuit H. Audi's bulletin 93 17 04 for the 2016 A3 e-tron lists P0DC800 as the last of its circuit codes; no letter beyond H appears there, which suggests eight circuits in that pack. Since the fix was software that let CAN communication begin on time, the entry can also stem from the controller not hearing its cell electronics early enough. GM's eAssist table 13OBDG05C shows the same idea under its own codes: losing LIN contact with a balance processor (P1B34, P1B35) counts as a fault after 7 of 10 checks every 200 ms and is rated Type B. California makes this supervision mandatory for hybrid OBD. Stuck and plausibility faults of H use P0DC9 to P0DCB.
- What you may notice
- Charging not possible at times
- Hybrid battery warning and check engine light
- Fault returns after clearing until software is updated
- Likely causes
- LikelyCell electronics not answering in time after wake-up (Audi software fix)
- PossibleDamaged internal bus or supply wiring to the monitoring board of group H
- RareOpen bleed path or lead in circuit H
- 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: €100 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.