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This has been a continual issue for last two winters. I am hoping for some ideas on how to diagnose it. Last winter, I replaced the ECM in my 2007 Silverado 5.3l because it went bad, Chevy programmed it. I thought it was the passkey system giving me issues because I had to reprogram that a couple times. Three months ago, sent the ecm to have the passkey turned off. Got it back, everything worked well, till it starting getting cold. Replaced the battery, and I just replaced the MAF thinking it might be the problem.
The truck is outside, if it sits out overnight and it is below 10 degrees it won’t start. the dash lights up, everything comes on, turn the key, nothing. The lights don’t dim, no effort to start. I leave the trickle charger on it thinking it is something to do with the battery, no difference. I have a code reader but I have no idea what to look for in regards to what might be happening. I have no idea if it is a sensor or a wire.
My mechanic doesn’t know what is wrong with it, and honestly I want to try to diagnose it before taking it to a dealer to have it looked at.Any ideas?
David
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As cliche as it sounds, i would start with the starter. Ive had starters go bad that were temperature sensitive. If the starter checks out then obviously check all fuses. If you want to troubleshoot modules, you could take a blow dryer to certain modules to heat them up to see if that does anything.
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I replaced the starter, and no difference. It still will not start. I will check the fuses today. Are the modules you suggest in the fusebox or are you talking about the ecm?
As for the cables, I checked them as best as I could, everything looks solid and good.
David
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Sorry for late response, try jump starting it with another car or battery pack. If it starts then it is 99 percent a cable connection issue (whether it be battery terminals or ground points that need to be cleaned). If not then check all fuses and or swap any relays. You could use a hair dryer to try to warm up the ecu, if that works then its ecu related
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I traded relays around, and at minus 8 degrees the truck started. So I ordered new relays and put those in. But changing the relays didn’t solve the problem, but it is an improvement. Sometimes it will start when it is cold and sometimes it won’t. I guess it has to be in a good mood. We are going to have good weather for a few days so I won’t have trouble starting it, but will continue to see if I can solve the issue. We will have cold days ahead.
In response to the ECM question. I replaced it with an aftermarket, but the chevy dealership reflashed it.
I am willing to attempt heating both the ECM and the BCM while it sits overnight. Need to find a safe way to do it. Will keep you updated.
David
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