P0B93Hybrid/EV Battery Voltage Sense R Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- A reading on sense R above anything a healthy cell could produce sets P0B93. GM's lithium-ion battery controllers of 2016 and 2019 use 4.8 V or more, held 1.4 s within 2 s, as a Type A fault. The 16OBDG02 programme with its own battery sensor module draws the line at 4.90 V, 14 of 18 samples. GM's eAssist mild hybrid already reacts above 4.65 V (7 of 10 samples, Type B). On the 2012 two-mode trucks the channel is nickel-metal hydride block 18, which must exceed 23 V in 15 of 20 samples, Type B. Because a cell this high would be dangerous, an electrical fault is far more likely: a sense lead touching a higher potential, or a damaged measuring input on the monitoring board.
- What you may notice
- MIL and hybrid system warning
- Charging or regeneration cut back
- Reduced power mode
- Likely causes
- LikelySense lead R in contact with a higher cell potential
- PossibleDamaged measuring input for channel R
- RareCell on channel R actually overcharged
- 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.