P0B52 code meaning
Hybrid/EV Battery Voltage Sense E Circuit High
Powertrain system Generic code P0Bxx codes Check engine light
What P0B52 means
The threshold behind P0B52 is chosen so that only a measurement error can reach it. A lithium-ion cell is fully charged at roughly 4.2 V, yet GM's battery energy control module waits for 4.8 V or more on channel E, for 1.4 s within 2 s, before storing the code as Type A, one trip. On the nickel-metal hydride packs of the 2012 two-mode trucks and SUVs the corresponding limit is 23 V for block 5, confirmed in 15 of 20 samples and stored as Type B. Since a false high reading could make the controller stop charging early or misjudge balancing, power and charging are restricted. Real overvoltage of a cell is reported by its own cell voltage codes.
P0B52 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.3 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B52
- Charging stops early or is refused
- MIL and reduced battery power
- Shorter electric range
Common causes of P0B52
- Most likelyChannel E sense line contacting a higher cell tap
- PossibleFaulty measuring input or reference in the monitoring module
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 eWiring harnessBms
What each part of P0B52 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. |
| 52 | The exact fault in that area. |
What to do next
- Note P0B52 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 P0B52
What does P0B52 mean?
P0B52 means "Hybrid/EV Battery Voltage Sense E Circuit High". The threshold behind P0B52 is chosen so that only a measurement error can reach it. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B52?
Drive gently and only to a workshop. With P0B52 the car can go into limp mode (reduced power) to protect itself.
Will P0B52 fail an emissions test?
Yes, it can. P0B52 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 P0B52 to fix?
Difficulty: workshop only. A typical repair takes 0.3 to 6 hours of work. This is a job for a workshop.
Will P0B52 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.