P0B5DHybrid/EV Battery Voltage Sense G Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0B5D is the J2012 code for an unsteady signal on cell sense channel G, a reading that flickers or drops out for moments without staying beyond a limit. No manufacturer documents P0B5D publicly. For orientation: GM monitors channel G with an open-line test (P0B59), a frozen-value comparison against the average cell voltage (P0B5A) and fixed low and high limits (P0B5B, P0B5C), but lists no erratic monitor. CARB requires the battery voltage sensors of the energy storage system to be monitored and faults to be traced to the smallest replaceable unit. For the owner the result is a warning that may vanish after a restart and reappear later; the root cause is usually a marginal contact.
- What you may notice
- Warning that disappears after restart and returns
- Brief reduction of electric power
- Likely causes
- LikelyMarginal contact at the channel G tap or connector
- PossibleSense harness under strain, losing contact with pack movement
- 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: €80 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.