Question about 2007 GMC Yukon
Just recently I have been experiencing starting problems. It dosen't seem to be whether the car is hot or cold. The first couple of times I tried starting it and it wouldn't even crank the clock reset to 12:00. After waiting about 20 minutes it starts right up. A couple of times when I tried to start it, it would just go click, click, click. I found the fuse box and relays under the hood. I started pulling them out and pushing them back in and after each one I tried starting until I finally came to one and it started. The next time it wouldn't start I just tried removing and replacing the one that had worked the last time. Well of course it didn't start. I then just started lifting the relays up and putting them back down and it started. It is very frustrating because I am pretty sure it has something to do with a relay not going to it's normal state after the key is turned off. It has always started first thing in the morning and usually after it has sat for awhile. By the way the car has usually been sitting for at least and hour before I have tried to start it and it wouldn't. It doesn't seem to excessively charge after any of these non starting episodes and I had the batter and alternator checked and they are both good. Any suggestion other than taking it to the dealer would be appreciated.
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Posted on Jan 02, 2017
I read your problem.
Is there a few step to diagnostic or try to fix your car.
Follow this simple steps.
Inspect the RALAY " Starter relay # 47. or interchange with other one just for testing.
1- Check the Fuse " IGN E Fuse number 22 " 10amp. on under hood fuse BOX fron Neutro swicth
And power to the power to the Neutro safetly switch.
2-- Check the Fuse " CRANK fuse # 17 10amp. Under hood fuse box. 12v. from Ignition switch
3- check the fuse " IGN A fuse # 34 40 amp. under hodd fuse box. Constant 12v. to relay.
With ignition switch in ON position.
Crank Fuse only when you try to start. If no power 12v. come when trying to start.
REmove the steering column covers. to get axces to the IGNITION SWITCH.
Trying to start check if 12 v on the YELLOW wire exist. if not. Check if there a 12v on the RED wire
If not Inspect FUSE # 34.
But if there a power on the red wire But not ON yellow wire Trying to start.
Just REPLACE THE IGNITION SWITCH. Electrical part.
Check the NEUTRO SAFETLY SWITCH. connector under the car. Repair as need.
CHeck the BACK-UP lights, some times come damaged making a short on the Neutro safetly switch. ...
OK.. I hope this help on your problem.
If you need more information letme know.
I'm a Mechanic and have all the information for repair vehicles.
Thank you for use fixya....
Posted on Sep 13, 2008
Ignition switch and neutral safety switch. Next time it happens wiggle thekeys in the ignition switch and try to restart.If it starts its probably the ignition switch. Then locate neutral safety switch on brake pedal and put meter on B+ wire from switch to starter relay and see if you get B+ on the would -be- crank. Next locate B+ wire from starter relay to starter hook a meter to it and see if you get B+ on the would -be crank.
Where ever B+ is missing is your problem.
Posted on Apr 14, 2010
Hi! Looks pretty much a PCM (powertrain control module) failure. The PCM is like a car's brain that when it fails everything else's fail. As a first course of action I strongly suggest that you have the PCM resetted on the dealership but if ever that the PCM is faulty this will require replacement. Hope this helps and thank you for using FixYa!
Posted on Aug 24, 2010
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