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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
the light will be set if the problem is on a certain bus, i think CAN B maybe. I guess if the problem come from something that send messages to the PCM.