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Reply To: 2007 Silverado 5.3l No Start No Crank only when it is cold outside

February 19, 2025 at 11:41 am #852372
GM Fan
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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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