Powertrain, generic · Hybrid propulsion

P0B80 Hybrid/EV Battery Voltage Sense N Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B80 describes an unsteady channel N signal: the voltage drops out or jumps for moments, then looks normal again. No manufacturer documents this code publicly. Ford's Fusion plug-in bulletin, which reaches exactly up to channel N, cites only the open-circuit code P0B7C, and GM's tables give channel N open, rationality, low and high diagnostics without a separate erratic test. Background is CARB 1968.2, under which battery voltage sensors in a hybrid energy storage system count as monitored components with their own fault codes. If a vehicle does store it, the trigger would be a contact that opens under vibration or temperature change, for example at the N tap, in the harness connector or at a board joint. Restarting may hide the fault for a while.

Likely causes

Contact at the N tap opening under vibration
Fretting corrosion in the sense harness connector
Solder joint cracking with temperature cycles

Symptoms

  • Intermittent hybrid warning
  • Fault not present after restart
  • Occasional loss of electric power

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 nwiring harnessbms

Related codes

P0B7CP0B7DP0B7EP0B7FP0B7BP0B85

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