Powertrain, generic · Hybrid propulsion

P0B69 Hybrid/EV Battery Voltage Sense J Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B69 is set when channel J is electrically present but its readings do not behave plausibly. GM's BAS Plus mild hybrid explains the logic most clearly: once the average cell voltage moves by more than 0.045 V, the cell under test must move in the same direction and by at least half as much; 20 failures in 40 samples set the code as Type B, two trips. The 2019 lithium-ion tables use a tighter trigger of 0.022 V and 35 of 40 samples, Type A. On the 2012 two-mode trucks the code belongs to nickel-metal hydride block 10 and compares its scaled value with the pack voltage. Neither Ford nor Chrysler publishes this channel; Chrysler's Pacifica bulletin stops at sense 6.

Likely causes

Channel J input reacting too little to real voltage changes
Corroded or high-resistance cell tap
Calibration error in the battery controller

Symptoms

  • MIL without obvious driveability problem
  • Hybrid assist reduced

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–5,000
Time0.3–8 h

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

Parts involved

hv battery voltage sense jwiring harnessbms

Related codes

P0B68P0B6AP0B6BP0B6CP0B64P0B6E

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.