P0B3D code meaning
Hybrid/EV Battery Voltage Sense A Circuit Low
Powertrain system Generic code P0Bxx codes Check engine light
What P0B3D means
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.
P0B3D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.2 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B3D
- MIL on
- Start-stop and electric assist unavailable
- Hybrid battery power limited
Common causes of P0B3D
- Most likelyBattery pack control module software, fixed by update (Ram eTorque)
- PossibleSense line shorted to the adjacent line or to the cell negative
- Less likelyMeasurement input of the cell monitoring chip failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery voltage sense aWiring harnessBms
What each part of P0B3D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B | Area: hybrid propulsion. |
| 3D | The exact fault in that area. |
What to do next
- Note P0B3D and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0B3D
What does P0B3D mean?
P0B3D means "Hybrid/EV Battery Voltage Sense A Circuit Low". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B3D?
Drive gently and only to a workshop. With P0B3D the car can go into limp mode (reduced power) to protect itself.
Will P0B3D fail an emissions test?
Yes, it can. P0B3D is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0B3D to fix?
Difficulty: workshop only. A typical repair takes 0.2 to 6 hours of work. This is a job for a workshop.
Will P0B3D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.