Code Definition

P0603 — Internal Control Module Keep Alive Memory (KAM) Error

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

About P0603

P0603 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 P0603 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

The P0603 fault code is set when the Engine Control Module (ECM) detects an issue with its Keep Alive Memory (KAM). The KAM is a portion of the ECM's memory that retains data about the vehicle's operating conditions, such as fuel trim, idle speed, and other critical parameters. This data is stored to optimise the vehicle's performance and is preserved even when the ignition is turned off, typically powered by the vehicle's battery. A KAM error indicates that this memory has been reset or lost its stored data, which can happen due to a variety of reasons such as a disconnected battery, a power ...

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