Powertrain, generic · Hybrid propulsion

P0B7F Hybrid/EV Battery Voltage Sense N Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Channel N reporting more voltage than a cell can hold leads to P0B7F. GM uses three thresholds depending on the system: 4.8 V or more for 1.4 s in 2 s on most lithium-ion battery controllers, above 4.90 V in 14 of 18 samples on the 2016 program with a separate sense module, both Type A, and above 4.65 V in 7 of 10 samples on the BAS Plus mild hybrid, Type B. The 2012 two-mode trucks treat N as NiMH block 14 and set the code above 23 V in 15 of 20 samples, Type B. The low counterpart is P0B7E, an open lead is P0B7C. Before suspecting the cell, a technician checks whether the N lead touches a neighbouring higher potential or whether the measuring input has drifted.

Likely causes

Sense lead N touching a higher potential
Drifted measuring input in the battery controller
Real overvoltage of the cell on channel N

Symptoms

  • MIL and warning in the instrument cluster
  • Regenerative braking and charging limited

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–6,000
Time1–8 h

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

Parts involved

hv battery voltage sense nwiring harnessbms

Related codes

P0B7CP0B7DP0B7EP0B80P0B7AP0B84

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com.