Question about Cars & Trucks
P0603 - GM
Powertrain - Computer and Auxiliary Outputs - ISO/SAE Controlled
Control Module Long Term Memory Reset Conditions
Cause DTC P0604 not set, key on, then the PCM determined that its calculated checksum that did not match a previous checksum • Refer to code repair chart for instructions on how to replace a PCM and how to reprogram the replacement
or you can ask the 24 hrs live technical support obd2 bmw icom, they will like to help you, good luck
Posted on Sep 12, 2013
P0603 means Internal Control Module Keep Alive Memory (KAM) Error
In other words, that code is set when the PCM loses "keep alive" memory B+.
This code can also be set if the batteries went dead at some point, but mainly it means there is an open circuit detected in the KAM circuit.
On a '97 F-250, check for a 5 amp fuse blown in fuse cavity #2. If the fuse is blown, check for and repair the short-to-ground in circuit #729 (red with white coloured wire).
Good luck dear.
Posted on Jan 24, 2010
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