P0C76 code meaning
Hybrid/EV Battery System Discharge Time Too Long
Powertrain system Generic code P0Cxx codes Check engine light
What P0C76 means
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.
P0C76 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P0C76
- Hybrid warning lamp or service high voltage message
- Vehicle may not start or become ready
- Loss of propulsion
Common causes of P0C76
- Most 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
- Less likelyLow 12 V supply during shutdown or module software
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery systemDischarge resistorMain contactors
What each part of P0C76 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C | Area: hybrid propulsion. |
| 76 | The exact fault in that area. |
What to do next
- Note P0C76 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 P0C76
What does P0C76 mean?
P0C76 means "Hybrid/EV Battery System Discharge Time Too Long". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C76?
Drive gently and only to a workshop. With P0C76 the car can go into limp mode (reduced power) to protect itself.
Will P0C76 fail an emissions test?
Yes, it can. P0C76 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 P0C76 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 6 hours of work. This is a job for a workshop.
Will P0C76 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.