Jomorisn Posted August 3, 2021 Share Posted August 3, 2021 (edited) I have a 2002 Mack CH 2002 427 it will run fine for weeks and then start stalling not starting until it sits for a while then start and stall lately will not stay running and I can't use the truck. it will show No Info on the dash and also throw 6-4 code I have cleaned all grounds that I could find. Can the VECM or the VECU cause these problems. Any and all help would great Thanks John Edited August 3, 2021 by Jomorisn Quote Link to comment https://www.bigmacktrucks.com/topic/67601-2002-mack-ch-427-6-4-codes-help/ Share on other sites More sharing options...
880joe Posted August 4, 2021 Share Posted August 4, 2021 I just had to replace the engine ecm on my 99 CH if I remember correctly it gave a 6-4 code. It acted up 1 day then ran fine for a week or so then went to leave 1 day it started and died immediately then never ran until I changed ecm. Quote Link to comment https://www.bigmacktrucks.com/topic/67601-2002-mack-ch-427-6-4-codes-help/#findComment-477904 Share on other sites More sharing options...
880joe Posted August 4, 2021 Share Posted August 4, 2021 I believe the 6-4 code means the ecm is not communicating with the vecm Quote Link to comment https://www.bigmacktrucks.com/topic/67601-2002-mack-ch-427-6-4-codes-help/#findComment-477905 Share on other sites More sharing options...
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