Jason Sirico

Update to the situation. After pulling ECM 1, ECM B, ETC, turning on the lights and disconnecting the battery for 20mins did the trick for the speedo. But now my truck still won't indicate neutral and won't let me engage 4x4 low. Is there something that I'm missing?

So the fuel pump did die, the truck sat for awhile until I had time to replace it, but by then it was dead. So after I charged the battery and tried starting it, it wasn't firing off. Saw that I blew my ecm fuse and just replaced it, as soon as I replaced it that's when my speedo pegged over and my shift stopped working correctly.

Hey guys. Long story short. I have a 99 Sierra 6.0L. Battery completely died and in the process of charging the battery and trying to start it, my ecm b fuse blew. I replaced it but now my speedo is pegged all the way to top speed and my gear selected icons won't indicate what gear I'm in. I tried searching forums and the web but couldn't find anything on GM trucks for this issue. What am I going to have to do? Is it possible to reset the ecm? Am I missing another fuse? I only find ECM "B" and couldn't locate "A". I'm a bit lost with electrical.