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Reaching out to see if anyone else has experienced this. I have a 2014 GMC Sierra 1500 All Terrain with the 5.3. I’m having problems with starting this thing from time to time. It will run fine for a few days and fire right up every time I get in it. However some days on a cold start or after driving awhile and stopping, when I get in to start it up I got all dash lights are working, except I notice my MPG history is erased (which tells me we’re in trouble) then I get messages on the dash that reads, service trailer brake system, service stabilitrac, power steering reduced. Then the check engine light will appear. When I try to crank everything goes black and I’m not hearing clicks from the engine. After I let it set for about 5 minutes it will fire right up no hesitation. I run the codes on it and there’s is a laundry list of codes, which the GMC dealership is saying they’re all low voltage codes...so we swap the battery truck, it runs fine for about a week and a half and then starts doing the same thing. Alternator is ok because I can see it recharging the amps on the truck....any ideas as to why might cause all this? I’m desparate!!!
08 Yukon Starting Issue When Hot
Lever23 posted a question in Ask the GM TechnicianI have a 2008 Yukon (5.3L V8, Flexfuel) that's having some starting issues after running for an extended period of time. Engine turns over fine when cold, but after driving for an extended period of time (minimum 30mins, varying speeds - city, highway), shutting the engine down and restarting after 10-30mins the vehicle starts funny. Instead of cranking over normally, it fires up almost immediately after turning the key - maybe half a crank. Engine then revs high for 5-10 seconds before returning to normal RPM. I've had the fuel pressure system tested and it came in at 55psi. I've also started monitoring if the issue pops up as the fuel level in tank decreases. I'm wondering if the Fuel Pressure Regulator on the engine block or on the tank could still be causing an issue like this? Or if the Fuel Injection System might have an issue? Any other suggestions would be greatly appreciated. Thanks!
1996 GMC Sierra SLE 7.4...Starting problems....cranks; but hesitates starting....replaced fuel pump...fuel filter...fuel pressure regulator...vehicles run great after it starts...check the fuel lines for possible air leaks....but no luck. Any suggestions?