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Check /test the ecm
Tap on it firmly with the handle of a good screwdriver in the spot marked in the pic

I like the 'X' marked for precise striking lol

(11-19-2022 )SquareOne Wrote: [ -> ]I like the 'X' marked for precise striking lol

Surprising you dont have to hit it very hard
this truck was doing the same thing a firm tap in that spot and it was like someone hit the switch
And the mark was for educational purposes lol