P0B83Hybrid/EV Battery Voltage Sense O 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
- P0B83 reports that channel O reads implausibly low. It is not the same as an open lead: GM's lithium-ion controllers run this check only while no open sense line fault is present, so a broken wire shows as P0B81 instead. The low limit there is 0.2 V or less for 1.4 s within 2 s, Type A. The BAS Plus mild hybrid sets it below 1.4 V in 7 of 10 samples, Type B. On the 2012 two-mode trucks, where O is NiMH block 15, block 15 and block 16 must both be under 2 V for 15 of 20 samples, Type B, with the 12 V supply between 9 and 18 V. Short circuits in the sense path towards ground or a lower cell are the main suspects; a genuinely dead cell is the exception and usually brings neighbouring codes as well.
- What you may notice
- MIL and hybrid warning lamp
- Electric operation switched off
- Likely causes
- LikelyShort in the O sense path towards ground or a lower cell
- PossibleMonitoring input reading low
- RareDead cell or NiMH block 15
- 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 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.