P0DD5Hybrid/EV Battery Cell Balancing Circuit K 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
- P0DD5 tells that circuit K is discharging its cells without a balancing request. Ford's 2016 hybrid OBD summary links the code to the BECM start-up check: before the contactors close it looks at the six cells of the circuit for 100 ms and fails it when one of them is more than 75 mV away from the average, confirmed on a second power cycle. A switch that conducts by itself can also be caught directly: in Toshiba patent US20130026994A1 the balancing switch is held off while a comparator watches the nodes on both sides of it; if one side sinks below the other, the switch is judged short-circuited. Apart from charge loss, the shorted path heats its resistor all the time. Inactive case: P0DD6.
- What you may notice
- Check engine light at start-up
- Group K drops faster than the other cells while parked
- Locally higher battery module temperature
- Likely causes
- LikelyShorted balancing switch of group K
- PossibleHeat damage or contamination bridging the balancing path of K on the board
- RareDriver stage of the monitoring chip holding channel K on
- 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.