Tell tell signs......ECM.

What are the tell tell signs of an ECM being fried. I was shaving the tailights of a 06 Silverado today and now it won't start or anything. I don't hear the usual click whenever I reconnect the battery. Sad part is, the battery was disconnected. I'm not sure what the deal is. I disconnected the battery, turned on the headlights to make sure there was no charge left in the system just like i've done 100 times on trucks. I go to start the truck up and nothing. The compressors run, doors pop, alarm sets, but nothing when I turn the key on. This sucks. Any advice.

Edited: 4/30/2008 9:24:57 PM by thacru78

What sucks worse.....the guy who does my muffler work never disconnects the batteries when he welds on mufflers. He's never had a problem. I always make him do it on trucks I take to him just to be careful. I was being careful and I think it happened anyways. I found a couple ECM's at a local junk yard for $100. But I don't want to buy the part and then it still not fix the problem. Any other idea what it might be.

u probably disconnected the fuel pump ground when you unhooked the taillights.

usually ecm would be like no fuel or spark check and make sure your getting voltage to the fuel pump

also some of the newer factory security sytems will have a kill switch when you do something like that. are there any security lights or a sold red light on when you try to start it. u might have triggered it when messing with the voltage.

There aint nothing happening. Cluster wont light up, door dinger, headlights, taillights, nothin. I can disconnect the battery, wait a while, then reconnect it, and nothing clicks, turns on, nothing. Its as if the alarm, poppers, and compressors are getting juice but the rest of the trucks not. That's why i thought it was the ECM, cause the whole truck is dead. Like a fuse is blown, for the whole truck.

So everything aftermarket is working and everything factory is not

Originally posted by Uncle Fester



So everything aftermarket is working and everything factory is not



LOL pretty much....thats a change.

customers truck ??

Originally posted by society_outkast



customers truck ??

Sadly.....He's a good friend of mine...so kind of a customer/friend hookup.

Only thing else it might be is I took the fenders off to put in fenders and round bar the lips...a wire might of come lose. But I don't see it totally shuting down the truck like that. That's why I was trying to get some info on the ECM. I've never had a ECM mess up nor have I talked to anyone who has. Like I said, my muffler guy welds on everything without removing the batter cables, and has never had a problem. The battery wasn't even in the truck whenever I was welding. So IDFK.