P0B47Hybrid/EV Battery Voltage Sense C Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Hybrid system warning and MIL
- Electric drive or engine start-stop no longer available
- Battery power limited, sluggish acceleration
- Likely causes
- 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)
- 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: €50 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.