P0B94Hybrid/EV Battery Voltage Sense R Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Warning appears and disappears between trips
- Short power reductions, normal after restart
- Likely causes
- LikelyCrimp or terminal of lead R opening under vibration
- PossibleHairline crack in the flexible circuit carrying channel R
- RareMoisture or contamination in the monitoring board connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.