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Ask Tims Auto Repair Your Own Question
Tims Auto Repair
Tims Auto Repair, GMC Mechanic
Category: GMC
Satisfied Customers: 15465
Experience:  have owned a repair shop for 25 years
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My name is ***** *****. My 2008 Yukon will not start and I

Customer Question

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.
JA: Thanks. Can you give me any more details about your issue?
Customer: Full power. Turns over and starts but then quits. Have had issue before and read numerous postings of similar problems.
JA: OK got it. Last thing — GMC Mechanics generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 9 months ago.
Category: GMC
Expert:  Tims Auto Repair replied 9 months ago.

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?

Customer: replied 9 months ago.
No
Expert:  Tims Auto Repair replied 9 months ago.

does it come on at all?

Customer: replied 9 months ago.
Goes off as it should. I have gotten the code U0109
Expert:  Tims Auto Repair replied 9 months ago.

ok,,stand by

Customer: replied 9 months ago.
But it's not the fuel issue
Expert:  Tims Auto Repair replied 9 months ago.

is the fuel pump coming on?

Customer: replied 9 months ago.
But then it cuts out. It cuts due to a security issue.
Expert:  Tims Auto Repair replied 9 months ago.

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

Expert:  Tims Auto Repair replied 9 months ago.

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

Customer: replied 9 months ago.
Correct
Expert:  Tims Auto Repair replied 9 months ago.

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

Expert:  Tims Auto Repair replied 9 months ago.

tell me,how did the problem first begin?

Customer: replied 9 months ago.
Randomly wouldn't start one day. No issues and then acted up. Does this on occasion. More often the last few days
Expert:  Tims Auto Repair replied 9 months ago.

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

Expert:  Tims Auto Repair replied 9 months ago.

i think it is only working at random

Expert:  Tims Auto Repair replied 9 months 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

Expert:  Tims Auto Repair replied 9 months 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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