Powertrain, generic · Hybrid propulsion

P0B94 Hybrid/EV Battery Voltage Sense R Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

No manufacturer documents P0B94 publicly. The code is reserved for a sense R signal that drops out or jumps for short moments instead of failing steadily. GM monitors channel R in six table sets between 2011 and 2019, but every one of those tables stops at the circuit, range, low and high monitors; an intermittent test does not appear. The legal basis is CARB 1968.2, which requires the voltage sensors of a hybrid energy storage system to be monitored like any other input and wants fault codes that point to the smallest replaceable unit. In practice such a fault would come from a connection that opens under vibration or heat, for instance a cracked crimp or a hairline crack in a flexible circuit.

Likely causes

Crimp or terminal of lead R opening under vibration
Hairline crack in the flexible circuit carrying channel R
Moisture or contamination in the monitoring board connector

Symptoms

  • Warning appears and disappears between trips
  • Short power reductions, normal after restart

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 rwiring harnessbms

Related codes

P0B90P0B91P0B92P0B93P0B8FP0B99

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