Powertrain, generic · Hybrid propulsion

P0DCA Hybrid/EV Battery Cell Balancing Circuit H Stuck Off

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P0DCA flags circuit H as inactive: balancing was ordered, but group H keeps its charge. Ford includes the code in its 2017 hybrid OBD summary, again decided by the start-up comparison of six cells per circuit with the pack average. Not every pause is a fault, which makes this code tricky. TI's BQ79616-Q1 stops a channel when its timer runs out, when the cell drops below a programmable floor between 2.45 and 4 V, on an unmasked fault, or for a thermal pause. A controller has to separate such intended stops from a bleed path that never conducts, for instance an open resistor or broken tap. Over many charges the unbalanced group H caps the charge. Under 13 CCR 1968.2 this must be detected. Opposite: P0DC9.

Likely causes

Bleed resistor of group H open

Broken cell tap or weld on the balancing lead of H

Intended stop (timer, thermal pause) wrongly judged as no response by the software

Symptoms

Full charge reached earlier, with less range than before
Cells of group H stay at the top of the cell list
Check engine light

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 hbms

Related codes

P0DAB P0DC8 P0DC9 P0DCB P0DC6 P0DE7

References: law.cornell.edu, fordservicecontent.com, ti.com.