Powertrain, generic · Hybrid propulsion

P0DDE Hybrid/EV Battery Cell Balancing Circuit M Stuck Off

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P0DDE means group M is not bled when it should be. Ford carries the code in its 2016 hybrid OBD summary with the usual BECM start-up rule: 100 ms with open contactors, six cells per circuit, a 75 mV gap to the average, confirmed over two power cycles. A balancing channel can also be stopped on purpose, which a diagnosis must keep apart from a real failure. TI's BQ79616-Q1 data sheet lists such ends: the per-channel timer expires, the cell falls below a set voltage, an unmasked fault appears or the host stops balancing. Only a path that never conducts after a valid start counts here. Left alone, the fuller cells of M reach their limit first at every charge, and the pack gives away capacity. Stuck-on case: P0DDD.

Likely causes

Bleed resistor of circuit M open

Balancing switch of group M that no longer turns on

Intended balancing stop for M misjudged as no response by the software

Symptoms

Check engine light while driving feels normal
Group M highest at the end of each charge
Less usable battery energy over time

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 mbms

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