P0DD8Hybrid/EV Battery Cell Balancing Circuit L
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0DD8 concerns the hardware of balancing circuit L, the twelfth group. No manufacturer documents it publicly; Ford, whose hybrid BECM runs through letter N, uses L only in the stuck codes P0DD9 and P0DDA. LG Chem's patent EP2730933A1 shows a way to test one balancing circuit through its neighbour: diagnosis resistors sit between each balancing circuit and its cell terminals, and when the circuit under test is switched on or off, the voltage measured across the adjacent circuit has to change in a known pattern. A missing or wrong pattern exposes a broken resistor, switch or connection. The CARB regulation requires separate codes that lead the technician to the replaceable unit. Stuck and plausibility faults of L: P0DD9 to P0DDB.
- What you may notice
- Hybrid battery warning and check engine light
- Power or charging limited
- Likely causes
- LikelyOpen resistor, switch or solder joint in circuit L
- PossiblePoor connection of the cell taps of group L
- RareFaulty voltage measuring channel next to circuit L
- 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: €200 – €4,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.