P0AC4 on Toyota
Hybrid Powertrain Control Module Requested MIL Illumination
P0AC4 on Toyota vehicles indicates hybrid powertrain control module requested mil illumination. Au7o has documented this code across 1 Toyota model — most commonly on RAV4. The hybrid powertrain control module has requested the malfunction indicator lamp be turned on due to a stored internal/hybrid system fault.
Common Causes of P0AC4
- •Internal hybrid powertrain control module fault
- •Stored hybrid system DTC requiring MIL
- •Communication/wiring fault
- •Module power/ground issue
P0AC4 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.
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View P0AC4 across all makes →Frequently Asked Questions
What does P0AC4 mean on Toyota?▼
P0AC4 stands for "Hybrid Powertrain Control Module Requested MIL Illumination." The hybrid powertrain control module has requested the malfunction indicator lamp be turned on due to a stored internal/hybrid system fault. On Toyota specifically, this code is documented across 1 model.
What causes P0AC4 on Toyota vehicles?▼
Common causes on Toyota: Internal hybrid powertrain control module fault, Stored hybrid system DTC requiring MIL, Communication/wiring fault, Module power/ground issue. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0AC4 on a Toyota?▼
Repair costs vary widely depending on the root cause and specific Toyota model.
Which Toyota models have P0AC4 documented?▼
Au7o has documented P0AC4 on 1 Toyota model: RAV4.