Powertrain, generic · Hybrid propulsion

P0DE1 Hybrid/EV Battery Cell Balancing Circuit N Stuck On

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

P0DE1 is the last stuck-on code of the series: group N keeps bleeding when it should rest. Ford lists it in every hybrid OBD summary from 2014 to 2019; in the 2017 edition the BECM spends 100 ms after key-on, while the contactors are still open, checking whether any of the six cells of circuit N sits more than 75 mV from the average, with two consecutive power cycles needed. A balancing switch that cannot open drains the group constantly, even with the car parked, and turns that energy into heat on the board. A cell with an internal short can produce the same falling voltage, so a check of the switch on the bench is worthwhile before the cells are condemned. Ford's 2014 code list ties the code to the MIL. Inactive case: P0DE2.

Likely causes

Balancing switch of group N permanently conducting

Monitoring electronics keeping the balancing command for N active

Cell of group N with an internal short causing the same voltage drop

Symptoms

Check engine light after switching on
Group N drops while the car is parked
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 nbms

Related codes

P0DAB P0DE0 P0DE2 P0DE3 P0DDD P0DE6

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