OBD-II diagnostic trouble code
P0605Caution

Internal Control Module Read Only Memory Error

A fault in the ECU's permanent program memory, which typically means the module needs reprogramming or replacement.

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Code names are compiled from open/standardized SAE and ISO references. Explanations, symptoms, causes and fixes are original. Covers generic (P0/C0/B0/U0) codes only — manufacturer-specific codes are planned for a future update.

Frequently asked questions

Can I drive with P0605?

You can usually keep driving with P0605, but don't put it off — the underlying cause can get worse or lead to further damage the longer it goes unaddressed. Get it diagnosed as soon as you reasonably can.

How much does it cost to fix P0605?

The cost varies too much by cause and vehicle to give a single figure here — a diagnosis will narrow it down.

What causes P0605?

AS
Reviewed by Artyom SemenovAutomotive Editor · Fact-checked by Yauheni Kapliarchuk, Editor-in-Chief
Code names compiled from open SAE/ISO references; explanations and repair guidance are original editorial content
Last verified: 09 Jul 2026 · Our methodology