P0B44 code meaning
Hybrid/EV Battery Voltage Sense B Circuit Intermittent/Erratic
Powertrain system Generic code P0Bxx codes Check engine light
What P0B44 means
P0B44 is the J2012 slot for a cell voltage channel B whose reading jumps or drops out for short moments rather than failing permanently. No manufacturer documents P0B44 publicly. For orientation, GM's 2019 tables check channel B for open sense lines (P0B40), frozen values compared with the other cells (P0B41) and fixed limits of 0.2 V and 4.8 V (P0B42, P0B43); an erratic monitor would add a test for implausible steps between samples. CARB requires the storage system's voltage sensors to be monitored as inputs and faults to be pinpointed to the smallest replaceable unit. Typical causes are vibration-loosened cell taps and connectors on the monitoring board. Warnings may come and go with driving conditions.
P0B44 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B44
- MIL or hybrid warning that comes and goes
- Occasional loss of electric drive or assist
Common causes of P0B44
- Most likelyLoose or cracked cell tap connection
- PossibleFretting or vibration damage at the monitoring board connector
- PossibleElectrical noise from inverter or motor coupling into the sense lines
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 bWiring harnessBms
What each part of P0B44 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. |
| 44 | The exact fault in that area. |
What to do next
- Note P0B44 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 P0B44
What does P0B44 mean?
P0B44 means "Hybrid/EV Battery Voltage Sense B Circuit Intermittent/Erratic". P0B44 is the J2012 slot for a cell voltage channel B whose reading jumps or drops out for short moments rather than failing permanently. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B44?
Drive gently and only to a workshop. With P0B44 the car can go into limp mode (reduced power) to protect itself.
Will P0B44 fail an emissions test?
Yes, it can. P0B44 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 P0B44 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 8 hours of work. This is a job for a workshop.
Will P0B44 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.