Code Definition

P0605 — Internal Control Module Read Only Memory (ROM) Error

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0605

P0605 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0605 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

Read only memory inside the Engine Control Module holds the permanent program code and calibration data that define how the module controls the engine, and unlike random access memory its contents are retained when power is removed. The module verifies the integrity of this memory by calculating a checksum across the stored program and comparing it against a reference value held for that purpose, normally at each key on event. DTC P0605 sets when that checksum comparison fails, meaning the stored program or calibration no longer matches what the module expects, so it can no longer guarantee it...

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