Powertrain, generic · Hybrid propulsion

P0B76 Hybrid/EV Battery Voltage Sense L Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B76 closes the channel L group and covers an erratic signal: values that jump or vanish briefly while the circuit otherwise works. No manufacturer documents this code publicly; GM, the only maker with public tables for L, defines open, plausibility, low and high tests for this channel but no erratic test, and the Ford bulletins name only the open-circuit code P0B72. CARB obliges manufacturers to monitor the battery voltage sensors of a hybrid energy storage system, which is the regulatory background of the code. Practically, an intermittent contact at the channel L tap, a fatigued harness or a cracked board joint would produce this picture. Warnings may disappear after a restart and return.

Likely causes

Intermittent contact at the channel L cell tap
Fatigued sense harness wire
Cracked solder joint on the monitoring board

Symptoms

  • Warning clears after restart and comes back
  • Momentary power reduction

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–5,000
Time1–8 h

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

Parts involved

hv battery voltage sense lwiring harnessbms

Related codes

P0B72P0B73P0B74P0B75P0B71P0B7B

References: law.cornell.edu, gsi.ext.gm.com, static.nhtsa.gov.