P0BAF code meaning
Hybrid/EV Battery Voltage Sense X Circuit Range/Performance
Powertrain system Generic code P0Bxx codes Check engine light
What P0BAF means
P0BAF covers a sense X signal that is electrically present yet does not behave like a real cell. For model year 2016 GM documents two versions in the same booklet. The Volt controller fails it when X moves in a different direction from the pack average, or by less than 0.005 V while that average moves more than 0.022 V, for 7 s within 8 s, Type A. The ELR variant samples every 200 ms, needs average movement above 0.006 V and fails after 20 of 40 samples, one trip. The eAssist hybrid asks for at least half of the average change, Type B over two trips, and GM's 2019 processor uses a 0.005 V trend test. Since the check pauses during circuit, low or high faults, P0BAF points to a stuck measurement rather than a broken wire.
P0BAF at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0BAF
- MIL without obvious driving change
- Reduced electric range in some cases
Common causes of P0BAF
- Most likelySense X value stuck while the pack voltage changes
- PossibleCalibration of the battery controller requiring reprogramming
- Less likelyCell X with deviating internal resistance
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 xWiring harnessBms
What each part of P0BAF 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. |
| AF | The exact fault in that area. |
What to do next
- Note P0BAF 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 P0BAF
What does P0BAF mean?
P0BAF means "Hybrid/EV Battery Voltage Sense X Circuit Range/Performance". P0BAF covers a sense X signal that is electrically present yet does not behave like a real cell. It is a generic code, so it means the same on every make.
Is it safe to drive with P0BAF?
Drive gently and only to a workshop. With P0BAF the car can go into limp mode (reduced power) to protect itself.
Will P0BAF fail an emissions test?
Yes, it can. P0BAF 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 P0BAF to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 6 hours of work. This is a job for a workshop.
Will P0BAF clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.