Powertrain, generic · Hybrid propulsion

P0DD8 Hybrid/EV Battery Cell Balancing Circuit L

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Open resistor, switch or solder joint in circuit L
Poor connection of the cell taps of group L
Faulty voltage measuring channel next to circuit L

Symptoms

  • Hybrid battery warning and check engine light
  • Power or charging limited

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–4,500
Time1–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery cell balancing circuit lbms

Related codes

P0DABP0DD9P0DDAP0DDBP0DD4P0DDC

References: law.cornell.edu, patents.google.com.