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I have a 2002 GMC 3/4 ton HD. The problem is sometimes it

Customer Question
doesn't start. I get in...
I have a 2002 GMC 3/4 ton HD. The problem is sometimes it doesn't start. I get in and turn the key. Nothing, I have battery power, but it doesn't make contact. It's like it's in drive. Please help!
JA: Is the car in "Park" or "Neutral?" Do you know if your car has a "wheel lock" feature?
Customer: It is in park. I move the lever down to L4 and back up to park, turning the key each time i come to a differant station. Sometimes this works. Sometimes. I don't know about any wheel lock. The truck has a auto trans.
JA: Are you fixing your Station yourself? What have you tried so far?
Customer: I took the truck to a mechanic. He said it was a fuse block and he replaced that. It still does the same thing.
JA: Anything else you want the mechanic to know before I connect you?
Customer: I guess thats it.
Submitted: 1 year ago.Category: GMC
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Answered in 51 minutes by:
10/10/2016
GMC Mechanic: Mike S., ASE Certified Technician replied 1 year ago
Mike S.
Mike S., ASE Certified Technician
Category: GMC
Satisfied Customers: 7,772
Experience: GMC N.A.I.S.E. Certified Auto-Mechanic
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Hi, I am Mike, welcome. I'm reviewing your question.

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GMC Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Try this. Hold the key on start while you move the shifter from park all the way to low and back and forth a few times while holding the key on start. Does at any time the starter catch?

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Customer reply replied 1 year ago
no
GMC Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Ok, that was just a test to see if maybe the neutral switch was the problem.

Is this the Sierra? If so, which engine dies it have in it?

Are you familiar with where the fuse box/s are and specifically the starter relay?

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Customer reply replied 1 year ago
I have the 6.6 diesel and the fuse block was has been changed
Customer reply replied 1 year ago
p.s. don't text me i have an old phone
GMC Mechanic: Mike S., ASE Certified Technician replied 1 year ago

I don't text

Go to that underhood fuse block, then tell me if the "IGN A" fuse is not blown.

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Customer reply replied 1 year ago
fuse is good
GMC Mechanic: Mike S., ASE Certified Technician replied 1 year ago

If all the fuses are just numbered, than it's #3.

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GMC Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Ok, great. Now do you have a voltmeter or at least a 12 volt test light? If so, test both sides of that fuse for voltage with the key off.

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GMC Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Then put your finger tips on the starter relay and have someone turn the key to start and tell me if you can feel that relay click.

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Customer reply replied 1 year ago
I am sorry. I'm handicaped and I,m in alot of pain. I can't do the things you want me to do
GMC Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Ok, do you want to wait until you have someone to help you?

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Customer reply replied 1 year ago
I think I will have it towed in to the dealers. I thought it was a simple fix or at the very least I would have an idea of want I'm dealing with. Thank you
GMC Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Well, you could try this and it should only cost $10 or so. Replace all the fuses associated with that starter and also replace the starter relay. The fuses are that fuse you just checked the IGN A and the IGN C in that same underhood fuse block. Then there is the CRANK fuse in the left I/P fuse block, that is located at the left side of the instrument panel. If it still is doing it, then you may be looking at a faulty park/neutral position switch which is on the transmission. It sounds like that may be it too since you did say sometimes moving the shifter does help it crank over.

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GMC Mechanic: Mike S., ASE Certified Technician replied 1 year ago

The crank fuse is #17.

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GMC Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Here is the wiring diagram I was looking at,

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Customer reply replied 1 year ago
ok thank you. you have been a great help. Have a good day good-by
GMC Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Don't forget to rate me well, so I get credit especially if changing any of those fuses or starter relay does get the starter working, if not, I understand.

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Mike S.
Mike S.
Mike S., ASE Certified Technician
Category: GMC
Satisfied Customers: 7,772
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