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| P0603 | Lack of proper voltage to the Keep Alive Memory connection on the PCM, Defective PCM Keep Alive Memory Module (KAM), Defective PCM ground circuit(s), Defective PCM controlled output devices |
--------------------------P0603 is a diagnostic trouble code related to the Keep Alive Memory (KAM) of the Powertrain Control Module (PCM). The KAM stores information such as idle air control settings, fuel trim values, and transmission shift points that the PCM uses for proper engine and transmission operation. A lack of proper voltage to the KAM or a defective KAM module can cause this code to be set. Other possible causes include a defective ground circuit for the PCM or issues with PCM-controlled output devices. To diagnose and repair the issue, a technician may perform a voltage check on the KAM circuit, inspect the wiring and connections, and replace the KAM module if necessary.
