2006 Sierra Starting Problems

[Chevyft]

So I have an ongoing issue. At random my truck won't start. I turn the key, all the lights come on and I hear the starter click but it won't engage, or may be it will, I never know. I have replaced the Batt, tried a different starter and even replaced the Clutch Safety Switch. I thought I had it fixed with the safety switch but it now failing to start again. I can jump start it but it won't start off a boost. Happens day or nigh, cold or warm. Turn the key 5, 10, 20 times and it may start or not. I'm always guessing and running out of ideas.

[Doug_Scott]

Try removing, cleaning and reinstalling the battery cables. Do not just grab them and tug to see if they are tight, actually remove the connection, clean, and put it back. Also take a good look at the connector on the end and make sure you are not seeing any corrosion in the actual wire where it goes into the connector.

 

If you hear the solenoid click on the starter, then you know the issue is somewhere between the inside of the battery and the ring gear on the flywheel. It will be in that path, not in the dash wiring or trans wiring.

[Chris]

Have the whole system tested. Dont just guess and replace parts. Most parts houses will test the battery, starter, and alternator for free. Since you skipped to guessing, this should be your next step. A component in the system is bad, so find out which by doing it right.

 

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[Chevyft]

I have had the charging system tested and all was good. I had the battery replaced at a shop when it was in for another reason. That was their fix to the problem, but it didn't fix it. I tried a new starter, but put the old one back on after the new one gave me the same problem and the old one is not that old, couple of years at the most. I replaced the cluch safety switch after researching the problem for a few days. As I said it work for a month but now the problem is back. I have had it at 3 different garages and other then a battery the only other idea anyone has is maybe the BCM.

 

I want to do a voltage test at the starter but of course it is starting now.

[Doug_Scott]

Have you actually taken the battery cables from the positive post to the starter, and ground from battery to engine block and checked inside the connectors for any corrosion? You should also check any ground straps from chassis to engine for corrosion.