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Old 11-11-2021, 08:14 AM   #1
Monte Howard
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Default 2001 gmc 8.1 ECM upgrade question

I have a 2001 GMC 2500 HD, the ECM isnít sending a pulse signal to the #4 injector. So I need to purchase a new ECM I am assuming. Anyone have experience upgrading the ECM on these 8.1 chevys for more performance for towing?
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Old 02-01-2022, 07:30 PM   #2
vette5148
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Default Re: 2001 gmc 8.1 ECM upgrade question

You should check for continuity between the injector plug in and the corresponding pins on the ecm plug in to make sure there isn't a break in the wiring somewhere. Hate to put in a new computer and it does the same thing. Have seen a broken wire or a mouse damaged one before.
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