07 Suburban 5.3 wont start when temps get under freezing.

Asked by Jan 08, 2017 at 10:26 PM about the 2007 Chevrolet Suburban 1500 LT 4WD

Question type: Maintenance & Repair

07 Suburban 5.3 wont start when temps get under freezing. Once temps get
up above freezing it fires right up. Everything works such as lights, dash, door
locks, etc. Just wont turn over.

3 Answers

118,205

So then we can assume that it does crank over just won't catch and run. So the first thing to test would be the sensors, if they are sending a false signal to the ECM it may think it is warmer than it really is so it won't enriched the fuel mixture to start the engine, you may what to consider having a live data scan performed, it might be the quickest way to find the fault.

24,105

Have your battery & alternator load tested preferably when its cold. And check or replace battery terminal & terminal wires and the engine grounds from battery & engine block to frame for good clean connections without corrosion. Have starter tested and/or replaced.

24,105

Also clean all electrical connections with contact cleaner (CRC) and use dielectric grease in connectors to remove moisture & keep it out.

Your Answer:

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