Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA20254RUNNER SR5, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION SYSTEM (AL80E / AL80F) - DIAGNOSTIC CODES (1 OF 3)AUTOMATIC TRANSMISSION SYSTEMDTC P0605-45: INTERNAL CONTROL MODULE READ ONLY MEMORY (ROM) ERROR PROGRAM MEMORY FAILURE [12/2024 - ]DESCRIPTION
2025 Toyota 4Runner SR5, RWD
DTC P0605-45: Internal Control Module Read Only Memory (ROM) Error Program Memory Failure [12/2024 - ]: Description
2025 Toyota 4Runner SR5, RWDSECTION Description
The TCM monitors its internal operation and will store this DTC when it detects an internal malfunction.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|---|
| P0605-45 | Internal Control Module Read Only Memory (ROM) Error Program Memory Failure | TCM internal malfunction (ROM checksum malfunction) (1-trip detection logic). | TCM | Comes on | Transmission | A | SAE: P0605 |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.