P0B86Hybrid/EV Battery Voltage Sense P Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0B86 belongs to channel P, the sixteenth sense lead, and indicates that this lead has lost its connection to the cell. Comparing GM's tables shows how the timing evolved: the 2016 Volt battery controller decides within 0.6 s, the 2019 version waits 0.8 s in a 1.6 s window; both use the 1.3 V adjacent-cell, 36 mV balancing gate and splice criteria and are Type A. GM's 2016 program with a separate sense module measures the sense line resistance instead, failing above 30.00 in 7 of 9 samples. On the BAS Plus mild hybrid the code is Type B after 7 of 10 samples showing lines N and N-1 below 1.4 V with a step over 0.5 V. Ford's public bulletins do not list P0B86. The pack usually has to come out for repair.
- What you may notice
- MIL and hybrid system fault message
- Vehicle runs only on the engine or with reduced power
- Likely causes
- LikelySense lead P open at the cell tap or connector
- PossibleExcessive resistance in the sense line (corrosion, loose screw)
- RareDefective input of the sense module
- 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: €150 – €6,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.