Question about 2001 Dodge Ram 2500 Truck

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My 5.9 has a slight miss (more obvious at lower rpm's) .

I have replaced plugs, distributor cap and rotor. no effect. when driving at slower speeds in o/d, the transmission is very jerky. the lower the gear and higher the rpm, the better it runs. also, the check engine light shows a code for a "internal control module". what is this? where is this? are the problems all related?

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  • gvarey Sep 12, 2009

    code reader said - po601 internal control module memory check sum error.

  • Tim Spear
    Tim Spear May 11, 2010

    what is teh diagnostic trouble code stored in it ?

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