P0B77
Hybrid/EV Battery Voltage Sense M Circuit
P0B77 is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery Voltage Sense M Circuit. Common causes: open or short circuit in the voltage sensor circuit, battery module voltage sensor malfunction. Estimated repair cost: $56–278.
Symptoms
- Reduced vehicle power
- Reducing electric range
- Check Engine Light Illuminates
- Hybrid system warning
- Incorrect battery level display
Causes
- Open or short circuit in the voltage sensor circuit
- Battery module voltage sensor malfunction
- Poor contact in wiring connectors
- Wiring harness damage
- Internal battery module failure
How to Fix
- Check the integrity of the wiring and connectors in the sensor circuit
- Test module M voltage sensor
- Check the insulation resistance of high-voltage circuits
- If necessary, replace the voltage sensor or wiring
- Perform Battery Management System (BMS) calibration
Related codes
Error P0B77 by Vehicle Brand
FAQ
What does the P0B77 code mean?
P0B77 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery Voltage Sense M Circuit
What causes a P0B77 error code?
The most common causes of P0B77 include: Open or short circuit in the voltage sensor circuit; Battery module voltage sensor malfunction; Poor contact in wiring connectors; Wiring harness damage.
How do I fix a P0B77 diagnostic trouble code?
To fix P0B77: Check the integrity of the wiring and connectors in the sensor circuit. Test module M voltage sensor. Check the insulation resistance of high-voltage circuits. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0B77?
Limited driving only, diagnose soon
How much does it cost to fix P0B77?
The estimated repair cost for P0B77 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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