Powertrain, generic · Hybrid propulsion

P0BA5 Hybrid/EV Battery Voltage Sense V Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0BA5 describes a sense V value that stays within limits but fails a rationality check against the other cells. GM's 16OBDG02 programme demands a trend of at least 0.002 V in the same direction as the average whenever that average moves more than 0.022 V, with 35 failures in 40 evaluations giving Type A. The 2019 hybrid processor works the same way with 0.005 V. For the 2016 model year GM lists two variants: the Volt with a 7 s in 8 s window and the ELR with 0.006 V of average movement and 20 of 40 samples at 200 ms. GM's eAssist expects half the average movement, Type B. Since the test is skipped while circuit, low or high faults are active, P0BA5 alone points to the measurement rather than an open lead.

Likely causes

Channel V reading stuck while other cells move
Battery controller firmware needing reprogramming
Aged cell V responding differently to load

Symptoms

  • MIL, little change in driving
  • Reduced regeneration or assist possible

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–5,000
Time0.5–6 h

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

Parts involved

hv battery voltage sense vwiring harnessbms

Related codes

P0BA4P0BA6P0BA7P0BA8P0BA0P0BAA

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