Powertrain, generic · Hybrid propulsion

P0B61 Hybrid/EV Battery Voltage Sense H Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

A lithium-ion cell cannot sit much above about 4.2 V, so when channel H reads 4.8 V or more the GM battery energy control module concludes the sense circuit is wrong and stores P0B61 after 1.4 s within a 2 s window, Type A. GM's BAS Plus mild hybrid sets the same code at more than 4.65 V on the cell sense line in 7 of 10 samples, Type B, while the 2012 two-mode hybrids treat H as nickel-metal hydride block 8 and only object above 23 V in 15 of 20 samples, Type B. A high reading usually comes from a sense lead touching a higher potential or from a monitoring input that floats when a reference connection is lost. Unlike P0B60 the controller here suspects overvoltage, so charging is typically blocked.

Likely causes

Channel H sense lead in contact with a higher cell tap
Lost reference connection letting the measuring input float
Internal fault of the cell monitoring chip

Symptoms

  • Charging refused or stopped early
  • MIL with reduced electric power

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 hwiring harnessbms

Related codes

P0B5EP0B5FP0B60P0B62P0B5CP0B66

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