P0B3DHybrid/EV Battery Voltage Sense A 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
- P0B3D sets when cell voltage channel A reads below the lowest value a real cell can have, which points to the measurement rather than the cell. GM sets it in the battery energy control module when cell voltage A is 0.2 V or less for 1.4 s within a 2 s window, Type A, one trip, provided no open sense line, communication or balancing fault is active. FCA lists P0B3D as Hybrid Battery Voltage Sense A Circuit Low on the 2019 Ram 1500 with eTorque mild hybrid, next to the pack-level code P0ABA, and cures it with a battery pack control module update. A genuinely low cell is reported with separate cell voltage codes. Expect reduced or blocked hybrid assist.
- What you may notice
- MIL on
- Start-stop and electric assist unavailable
- Hybrid battery power limited
- Likely causes
- LikelyBattery pack control module software, fixed by update (Ram eTorque)
- PossibleSense line shorted to the adjacent line or to the cell negative
- RareMeasurement input of the cell monitoring chip failed
- 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: €50 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.