P0B47 code meaning
Hybrid/EV Battery Voltage Sense C Circuit Low
Powertrain system Generic code P0Bxx codes Check engine light
What P0B47 means
P0B47 is stored when channel C delivers a voltage too low to come from a working cell or block, so the controller blames the measurement rather than the battery. GM documents two implementations. On lithium-ion packs the battery energy control module sets it at 0.2 V or less for 1.4 s within 2 s, Type A, one trip, unless an open sense line, communication or balancing fault is already active. On the 2012 Tahoe, Yukon, Escalade, Silverado and Sierra two-mode hybrids channel C is nickel-metal hydride block 3; there block 3 and block 4 must both read under 2 V in 15 of 20 samples, Type B, two trips. Shorted sense lines or a failed measuring input are the usual suspects.
P0B47 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.3 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B47
- Hybrid system warning and MIL
- Electric drive or engine start-stop no longer available
- Battery power limited, sluggish acceleration
Common causes of P0B47
- Most likelySense lines of channel C shorted to each other or to a neighbouring tap
- PossibleFailed measuring input in the battery monitoring module
- PossibleLoose or corroded block connector shared by blocks 3 and 4 (GM two-mode)
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 cWiring harnessBms
What each part of P0B47 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. |
| 47 | The exact fault in that area. |
What to do next
- Note P0B47 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 P0B47
What does P0B47 mean?
P0B47 means "Hybrid/EV Battery Voltage Sense C Circuit Low". P0B47 is stored when channel C delivers a voltage too low to come from a working cell or block, so the controller blames the measurement rather than the battery. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B47?
Drive gently and only to a workshop. With P0B47 the car can go into limp mode (reduced power) to protect itself.
Will P0B47 fail an emissions test?
Yes, it can. P0B47 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 P0B47 to fix?
Difficulty: workshop only. A typical repair takes 0.3 to 6 hours of work. This is a job for a workshop.
Will P0B47 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.