Powertrain, generic · Hybrid propulsion

P0DCD Hybrid/EV Battery Cell Balancing Circuit I Stuck On

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

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.

Likely causes

Balancing switch of group I permanently conducting

Driver stage of the monitoring chip stuck active on channel I

Software leaving a deliberate switch activation (e.g. chip warming) active

Symptoms

Check engine light with hybrid battery warning at start-up
Group I lower than the rest after longer standstill
Shorter electric range

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€300–4,500

Time1.5–8 h

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

Parts involved

hv battery cell balancing circuit ibms

Related codes

P0DAB P0DCC P0DCE P0DCF P0DC9 P0DE6

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