P0B61 code meaning
Hybrid/EV Battery Voltage Sense H Circuit High
Powertrain system Generic code P0Bxx codes Check engine light
What P0B61 means
A lithium-ion cell cannot sit much above about 4.2 V, so when channel H reads 4.8 V or more the GM battery energy control module concludes the sense circuit is wrong and stores P0B61 after 1.4 s within a 2 s window, Type A. GM's BAS Plus mild hybrid sets the same code at more than 4.65 V on the cell sense line in 7 of 10 samples, Type B, while the 2012 two-mode hybrids treat H as nickel-metal hydride block 8 and only object above 23 V in 15 of 20 samples, Type B. A high reading usually comes from a sense lead touching a higher potential or from a monitoring input that floats when a reference connection is lost. Unlike P0B60 the controller here suspects overvoltage, so charging is typically blocked.
P0B61 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B61
- Charging refused or stopped early
- MIL with reduced electric power
Common causes of P0B61
- Most likelyChannel H sense lead in contact with a higher cell tap
- PossibleLost reference connection letting the measuring input float
- Less likelyInternal fault of the cell monitoring chip
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 hWiring harnessBms
What each part of P0B61 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. |
| 61 | The exact fault in that area. |
What to do next
- Note P0B61 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 P0B61
What does P0B61 mean?
P0B61 means "Hybrid/EV Battery Voltage Sense H Circuit High". A lithium-ion cell cannot sit much above about 4.2 V, so when channel H reads 4.8 V or more the GM battery energy control module concludes the sense circuit is wrong and stores P0B61 after 1.4 s within a 2 s window, Type A. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B61?
Drive gently and only to a workshop. With P0B61 the car can go into limp mode (reduced power) to protect itself.
Will P0B61 fail an emissions test?
Yes, it can. P0B61 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 P0B61 to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0B61 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.