P0B5FHybrid/EV Battery Voltage Sense H Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- With P0B5F the channel H wiring is intact, but the value it delivers does not fit the rest of the battery. GM runs two quite different plausibility tests. On the 2012 two-mode hybrids (Tahoe, Yukon, Escalade, Silverado, Sierra) channel H is nickel-metal hydride block 8 of 20; the battery pack control module multiplies blocks 8 and 9 by twenty and fails the test when both differ from the measured pack voltage by more than 70 V in 160 of 170 samples, Type B, two trips, with active pack voltage codes P0ABB to P0ABD blocking it. Lithium-ion systems in the 2019 tables look for a frozen reading instead: if H stays put while the average cell voltage trends, 35 of 40 samples set the code, Type A.
- What you may notice
- Hybrid system warning with MIL
- Reduced electric assist or regeneration
- Inaccurate state-of-charge display
- Likely causes
- LikelyBlock or cell voltage input for channel H drifting away from the true value
- PossibleMeasuring chip input stuck at a constant value
- RareFaulty pack voltage reference distorting the comparison
- 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: €100 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.