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AFAIK it was on all the 3126b trucks - at least through @Lostchain 's 2003 and the C7 came along in 2004.5...... The C7's don't have it so it would seem to have been done-away-with around that time frame. The 3126b and C7 use near identical ECM's. I think it was a precaution that turned out to...

Yep. That little guy is discontinued and apparently unnecessary. But our tax dollars bought one for every truck because reasons...... 2000 of them per truck if you count $'s as reasons. Been meaning to open one up and see what cost so damn much money.

You need a J1939 scan tool, or a laptop with CAT ET. As @Lostchain said - you are just spinning your wheels and wasting diagnostic time till you talk to the computer (or not if it's the problem) and look at live data. 3126b or C7 truck? The 3126b had a deprecated EMI/RFI filter box on the...