P0B94 code meaning
Hybrid/EV Battery Voltage Sense R Circuit Intermittent/Erratic
Powertrain system Generic code P0Bxx codes Check engine light
What P0B94 means
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.
P0B94 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B94
- Warning appears and disappears between trips
- Short power reductions, normal after restart
Common causes of P0B94
- Most likelyCrimp or terminal of lead R opening under vibration
- PossibleHairline crack in the flexible circuit carrying channel R
- Less likelyMoisture or contamination in the monitoring board connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery voltage sense rWiring harnessBms
What each part of P0B94 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B | Area: hybrid propulsion. |
| 94 | The exact fault in that area. |
What to do next
- Note P0B94 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0B94
What does P0B94 mean?
P0B94 means "Hybrid/EV Battery Voltage Sense R Circuit Intermittent/Erratic". No manufacturer documents P0B94 publicly. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B94?
Drive gently and only to a workshop. With P0B94 the car can go into limp mode (reduced power) to protect itself.
Will P0B94 fail an emissions test?
Yes, it can. P0B94 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0B94 to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0B94 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.