P0605 Internal Control Module Read Only Memory (ROM) Error

P0605 points to an internal control module read-only memory error. The module reports a fault with internal stored program memory or its validation.

Code status

Needs verification

Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.

System
Computer
Scope
iso-sae-controlled-p0
Standard
SAE J2012 / ISO 15031-6
Source
legacy-import

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not treat internal-module codes casually; replacement may require programming, immobilizer setup, and diagnosis of why the failure occurred.

Useful checks before replacing parts

Related OBD-II codes

These nearby computer entries can help compare wording and fault area. They may share the same verification status as the source database.