P0AC4 on 2019-2022 Toyota RAV4 (Hybrid LE, Hybrid XLE, Hybrid XSE, Hybrid Limited, RAV4 Prime) — Hybrid Powertrain Control Module Requested MIL Illumination
1 vehicles · 1 makes
Most Reported On
P0AC4 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2019-2022 Toyota RAV4 (Hybrid LE, Hybrid XLE, Hybrid XSE, Hybrid Limited, RAV4 Prime).
Common Causes
Diagnostic Tools
To diagnose P0AC4, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
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LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
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Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
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- Oil reset, EPB, BMS, TPMS, injector coding
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FAQ
What does P0AC4 mean?
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.
What are the most common causes of P0AC4?
The most common causes of P0AC4 are: Internal hybrid powertrain control module fault, Stored hybrid system DTC requiring MIL, Communication/wiring fault, Module power/ground issue. The specific cause varies by vehicle.
How much does it cost to fix P0AC4?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0AC4?
Au7o has documented P0AC4 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.