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My name is ***** *****. My 2008 Yukon will not start and I…

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Hello. My name is...

Hello. My name is ***** *****. My 2008 Yukon will not start and I believe the issue is the security system. Have had problem before and had shop work on it and thought it was taken care of. Everything lights as usual. Turns over and fires and immediately quits.

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

Full power. Turns over and starts but then quits. Have had issue before and read numerous postings of similar problems.

Submitted: 2 years ago.Category: GMC
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Answered in 2 hours by:
3/6/2016
GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 2 years ago
Tims Auto Repair
Tims Auto Repair, GMC Mechanic
Category: GMC
Satisfied Customers: 16,247
Experience: have owned a repair shop for 25 years
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Hi, My name is ***** ***** for the delay.

I will do my best to assist you.

does the security light stay on with the ignition on?

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Customer reply replied 2 years ago
No
GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 2 years ago

does it come on at all?

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Customer reply replied 2 years ago
Goes off as it should. I have gotten the code U0109
GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 2 years ago

ok,,stand by

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Customer reply replied 2 years ago
But it's not the fuel issue
GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 2 years ago

is the fuel pump coming on?

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Customer reply replied 2 years ago
But then it cuts out. It cuts due to a security issue.
GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 2 years ago

ok,,the fuel pump will only come on for two seconds when you first turn on the key

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GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 2 years ago

then it is suppose to run all the time that the engine is turning

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Customer reply replied 2 years ago
Correct
GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 2 years ago

i dont think it is a security issue sense the security light doesnt stay on

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GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 2 years ago

tell me,how did the problem first begin?

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Customer reply replied 2 years ago
Randomly wouldn't start one day. No issues and then acted up. Does this on occasion. More often the last few days
GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 2 years ago

ok..i think you may have a bad fuel pump,,sense you also get the fuel pump code

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GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 2 years ago

i think it is only working at random

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GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 2 years ago

another thing that may cause a similer problem is the crank sensor..the crnk sensor can do this and not give a code for it

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GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 2 years ago

1 - Ignition Coil 8 2 - Ignition Coil 6 3 - Ignition Coil 4 4 - Manifold Absolute Pressure (MAP) Sensor 5 - Throttle Body 6 - Ignition Coil 2 7 - Knock Sensor (KS) - 2 8 - Crankshaft Position (CKP) Sensor 9 - Oil Level Switch 10 - Starter 11 - Valve Lifter Oil Manifold (VLOM) Assembly (LY5/LMG/L76/LC9) 12 - Engine Oil Pressure (EOP) Sensor

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