Powertrain, generic · Hybrid propulsion

P0DD2 Hybrid/EV Battery Cell Balancing Circuit J Stuck Off

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P0DD2 marks circuit J as unable to bleed: balancing is commanded, but the six cells of group J keep their charge. Ford lists the code in its 2015 hybrid OBD summary with the same power-up test as for the stuck-on case, run for 100 ms with the contactors still open, two consecutive power cycles and the 75 mV limit against the average cell voltage. GM's 2013 eAssist table documents a more direct test under its own code P1EAA: with the key off and the contactors open, a cell's balancing resistor is switched on and the cell voltage has to move by at least 0.1 V; two failed samples across key cycles give a Type A fault. Over many charges group J ends up high and caps the full charge. Opposite: P0DD1.

Likely causes

Bleed resistor of circuit J open or burnt

Balancing switch of group J no longer closing

Interrupted balancing lead between cell tap and board

Symptoms

Check engine light without noticeable change in driving
Cells of group J at the top of the cell list at the end of charging
Usable battery capacity declining 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 jbms

References: law.cornell.edu, fordservicecontent.com, gsi.ext.gm.com.