P0DCDHybrid/EV Battery Cell Balancing Circuit I Stuck On
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0DCD tells that circuit I is drained although no balancing is wanted. In Ford's 2014 hybrid OBD summary the code belongs to the start-up check with open contactors; that early version only sets it after the 75 mV spread within the six-cell group has shown up on two consecutive power-ups. A diagnosis must also know when a switch is on deliberately. Samsung SDI's patent US11327122B2 turns balancing switches on in groups to warm the voltage monitoring chip when it is cold, and switches them off again as the chip warms up. Such intended activity must not count as stuck on; a switch that keeps conducting after every command to open does. Expect group I to lag after parking. CARB section (e)(15.2.3) accepts checks on the switches themselves. Inactive case: P0DCE.
- What you may notice
- Check engine light with hybrid battery warning at start-up
- Group I lower than the rest after longer standstill
- Shorter electric range
- Likely causes
- LikelyBalancing switch of group I permanently conducting
- PossibleDriver stage of the monitoring chip stuck active on channel I
- RareSoftware leaving a deliberate switch activation (e.g. chip warming) active
- 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.