P1C80 on 2019-2022 Toyota RAV4 — Hybrid/EV Battery Voltage System Isolation (Rear Motor Area) Internal Electronic Failure
1 vehicles · 1 makes
Most Reported On
P1C80 is an OBD-II diagnostic trouble code meaning “Hybrid/EV Battery Voltage System Isolation (Rear Motor Area) Internal Electronic Failure.” The hybrid vehicle control ECU continuously monitors electrical isolation (insulation resistance) between the high-voltage circuit and vehicle chassis ground. P1C80 (stored as P1C8049) sets when the monitored isolation fault is localized to the rear motor area — the Motor Generator Rear (MGR) high-voltage circuit and the HV floor-under wire harness feeding it. Toyota T-SB-0026-22 states the condition is caused by corrosion, dirt, or debris at connector Y6 at the Motor Generator Rear, which degrades insulation between the HV cable and ground. This code is most commonly reported on 2019-2022 Toyota RAV4.
Common Causes
Diagnostic Tools
P1C80 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does P1C80 mean?
P1C80 stands for "Hybrid/EV Battery Voltage System Isolation (Rear Motor Area) Internal Electronic Failure." The hybrid vehicle control ECU continuously monitors electrical isolation (insulation resistance) between the high-voltage circuit and vehicle chassis ground. P1C80 (stored as P1C8049) sets when the monitored isolation fault is localized to the rear motor area — the Motor Generator Rear (MGR) high-voltage circuit and the HV floor-under wire harness feeding it. Toyota T-SB-0026-22 states the condition is caused by corrosion, dirt, or debris at connector Y6 at the Motor Generator Rear, which degrades insulation between the HV cable and ground.
What are the most common causes of P1C80?
The most common causes of P1C80 are: Corrosion inside HV connector Y6 at the Motor Generator Rear (MGR), from road salt/water intrusion, Dirt and debris inside the MGR high-voltage connector, Damaged or degraded HV floor-under wire harness insulation along the underbody routing, Improperly torqued high-voltage bolts or misrouted/unsecured HV cables after prior service. The specific cause varies by vehicle.
How much does it cost to fix P1C80?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P1C80?
Au7o has documented P1C80 across 1 vehicle models from 1 manufacturers: Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.