Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
Start by charging the vehicle's battery and clean the terminal, once the battery is charged and the terminals are clean and secured, erase the code. If the code comes back ON, then you may have to reprogram or replace Engine Control Module (ECM) / Powertrain Control Module (PCM)
To diagnose the P0603 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
Indicates the Engine Control Module (ECM) / Powertrain Control Module (PCM) has experienced an internal memory fault.
Battery voltage is supplied to the Engine Control Module (ECM) / Powertrain Control Module (PCM) even when the ignition switch is turned OFF for the ECM/PCM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc.
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