2001 gmc 8.1 ECM upgrade question

Monte Howard · 11-11-2021, 08:14 AM

I have a 2001 GMC 2500 HD, the ECM isn’t 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?

vette5148 · 02-01-2022, 07:30 PM

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.

11-11-2021, 08:14 AM	#1
Monte Howard Member Join Date: Nov 2002 Location: Potomac,IL Posts: 250 Likes: 1 Liked 40 Times in 11 Posts	2001 gmc 8.1 ECM upgrade question I have a 2001 GMC 2500 HD, the ECM isn’t 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? __________________ Monte Howard 3209 STK, 3208 SS

02-01-2022, 07:30 PM	#2
vette5148 Junior Member Join Date: Jan 2022 Posts: 9 Likes: 13 Liked 22 Times in 6 Posts	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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