P0B5F code meaning
Hybrid/EV Battery Voltage Sense H Circuit Range/Performance
Powertrain system Generic code P0Bxx codes Check engine light
What P0B5F means
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.
P0B5F 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 P0B5F
- Hybrid system warning with MIL
- Reduced electric assist or regeneration
- Inaccurate state-of-charge display
Common causes of P0B5F
- Most likelyBlock or cell voltage input for channel H drifting away from the true value
- PossibleMeasuring chip input stuck at a constant value
- Less likelyFaulty pack voltage reference distorting the comparison
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 hWiring harnessBms
What each part of P0B5F 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. |
| 5F | The exact fault in that area. |
What to do next
- Note P0B5F 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 P0B5F
What does P0B5F mean?
P0B5F means "Hybrid/EV Battery Voltage Sense H Circuit Range/Performance". With P0B5F the channel H wiring is intact, but the value it delivers does not fit the rest of the battery. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B5F?
Drive gently and only to a workshop. With P0B5F the car can go into limp mode (reduced power) to protect itself.
Will P0B5F fail an emissions test?
Yes, it can. P0B5F 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 P0B5F to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0B5F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.