P0C76Hybrid/EV Battery System Discharge Time Too Long
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0C76 means the high-voltage bus is still too high a set time after the contactors opened, so the inverter capacitor was not drained as intended. GM publishes thresholds: the 2011 Volt flags more than 200 V after 3.5 s (Special Type C, no MIL), the 2013 eAssist cars more than 65 V after 6.5 s and the 2019 tables more than 200 V after 3.5 s, both Type A after two failed runs. Bulletins name welded contactors on the 2019 Volt (software update, N192226060), a high-voltage cable that had worked loose on the inverter terminal of the 2017 Pacifica Hybrid (08-107-17) and, on GM two-mode trucks, jump-starting with the key on (PIT4585E). A failed discharge circuit is the classic part fault. Treat the bus as live until measured.
- What you may notice
- Hybrid warning lamp or service high voltage message
- Vehicle may not start or become ready
- Loss of propulsion
- Likely causes
- LikelyActive discharge circuit or discharge resistor in the inverter failed
- PossibleMain contactor welded closed so the battery keeps feeding the bus
- PossibleLoose high-voltage cable or terminal at the inverter
- RareLow 12 V supply during shutdown or module software
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.