P0BAE code meaning
Hybrid/EV Battery Voltage Sense X Circuit
Powertrain system Generic code P0Bxx codes Check engine light
What P0BAE means
Channel X, number twenty-four, starts with P0BAE, the open-lead code. The first-generation Volt of 2011 already detected it through several cases: two neighbouring readings more than 1 V apart, a busbar sense voltage above 0.7 V combined with an implausible cell voltage, or adjacent cells differing by more than 0.5 V on a shared supply line. GM's later 16OBDG02 programme measures the sense line resistance directly and fails it above 30.00 in seven of nine samples, Type A; the unit is not printed. In the 2019 battery energy control module the familiar 1.3 V and 36 mV criteria apply with 0.8 s in 1.6 s. Whichever method is used, the controller loses sight of one cell and normally restricts the battery.
P0BAE at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0BAE
- MIL and service message for the high-voltage system
- Vehicle may stay out of ready mode
- Charging stops early
Common causes of P0BAE
- Most likelySense lead X broken or disconnected
- PossibleLoose busbar fastener at the X sensing point
- Less likelySense harness X damaged during earlier battery work
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 P0BAE 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. |
| AE | The exact fault in that area. |
What to do next
- Note P0BAE 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 P0BAE
What does P0BAE mean?
P0BAE means "Hybrid/EV Battery Voltage Sense X Circuit". Channel X, number twenty-four, starts with P0BAE, the open-lead code. It is a generic code, so it means the same on every make.
Is it safe to drive with P0BAE?
Drive gently and only to a workshop. With P0BAE the car can go into limp mode (reduced power) to protect itself.
Will P0BAE fail an emissions test?
Yes, it can. P0BAE 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 P0BAE to fix?
Difficulty: workshop only. A typical repair takes 1 to 10 hours of work. This is a job for a workshop.
Will P0BAE clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.