2005 2500HD Duramax starter won't engage when cold (intermittent)
When the weather gets cold the starter won't engage or skips. I can turn the key but the starter either gets no power or skips in and out. Almost like a loose connection or solenoid/relay problem. Dealership couldn't fing anything wrong. "It started up for us". They didn't even look at it.
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Just guessing, but try checking the battery connections and the battery! It sounds like it was cold. I believe the ECU will keep it from starting if the voltage from the battery is low. Turning on the lights warmed up the battery a little and increased its terminal voltage. I have seen similar things in the past. Pops always turned on the lights for a minute when starting in cold weather.
The remote and key are two different things. When turning the key, you are searching for a good contact in the ignition switch. Cold weather just makes it worse to get a contact. Replace the ignition switch. The remote start. If it is after market. Take it out. Repair the wires. Soon it will die and won't let you start your vehicle. Then you will pay someone like me, that works at a shop, to tear it out and charge you $200 to do it. I just did one. A two minute fix, because I know. and a $200 bill. I got paid $1.5 to do it.
My lb7 does this intermittently and I also have replaced the starter many times. After seeing internet postings by hundreds of owners spending many thousands of dollars "to beat a dead horse." It is obvious that gm's design specs of components involved with starter engagement is very poor engineering. This spec allows an accumulation of tolerances of components to be outside of limits. Any engineer worth his salt would have recognized the problem immediately. Since all duramax trucks are prone to this with no proper permanent fix offered by gm, a lawsuit instituted against gm is the only action that will force them to solve the problem.
Get your battery voltage checked.The cold weather will reduce the strength of your battery. The starter solenoid is trying to engage the starter but it doesn't have enough power from the battery to make it happen.If the battery voltage is low then get it recharged .The voltage of fully charged battery will show near to 12 volts.--------------That's it.
Ok , on those years ,the automatic has a plastic box on the driver side. This is the shift positioning sensor. It tells the transmission if it is in drive neutral and so forth. It is probably not telling the engine that it is safe to start from the neutral safety switch. One thing to try, Turn the key to the starter engage position, hold it there. At the same time grab the gear shift and push it up hard or pull it down past neutral. See if the starter engages? Let me know if this helps, I have a few other ideas as well.