P1C80 on Toyota
Hybrid/EV Battery Voltage System Isolation (Rear Motor Area) Internal Electronic Failure
P1C80 on Toyota vehicles indicates hybrid/ev battery voltage system isolation (rear motor area) internal electronic failure. Au7o has documented this code across 1 Toyota model — most commonly on RAV4. 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.
Common Causes of P1C80
- •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
P1C80 on Toyota by Model
Toyota RAV4(1 issue)
- Certain 2019-2022 RAV4 Hybrid AWD/2021-2022 Prime HV Cable Corrosion - CSP 22TE092019-2022
Toyota Customer Support Program 22TE09 covers certain 2019-2022 RAV4 Hybrid AWD and 2021-2022 RAV4 Prime vehicles produced within the program's listed periods. Excessive corrosion at the connector between the HV floor-under wire harness and rear traction-motor cable may cause AM-radio static during specified drive selections, P0AA649 and/or P1C8049 with warning messages, or a vehicle that will not start. Toyota does not describe a blanket complete shutdown while driving, loss of AWD, P0AA6/P0A7F/P0AC4 condition or universal cable part number.
Looking for P1C80 on a different make?
View P1C80 across all makes →Frequently Asked Questions
What does P1C80 mean on Toyota?▼
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. On Toyota specifically, this code is documented across 1 model.
What causes P1C80 on Toyota vehicles?▼
Common causes on Toyota: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1C80 on a Toyota?▼
Repair costs vary widely depending on the root cause and specific Toyota model.
Which Toyota models have P1C80 documented?▼
Au7o has documented P1C80 on 1 Toyota model: RAV4.