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Pete, GMC Technician
Category: GM
Satisfied Customers: 28250
Experience:  14 years GM dealership technician and training.
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Replaced ignition relay switch 2 weeks ago for no start and

Customer Question

replaced ignition relay switch 2 weeks ago for no start and happened again today.
JA: How many miles are on the car? Has the car been starting normally?
Customer: All lights, radio etc work but wont attempt to crank. Let it sit for 10 minutes and then it started. No security light on. 2006 GMC Envoy Denali auto 4x4
JA: Are you fixing your Envoy yourself? What have you tried so far?
Customer: 112k miles. This is the third time its done this in the last 6 months. 1st time since replacing the ignition switch. Fixing myself, replaced relay switches and no help.
JA: OK. To minimize me, please click the down arrow at the top right corner of this box.
Customer: If I pull the ignition relay and bypass it with a wire, the starter cranks
JA: Anything else you want the mechanic to know before I connect you?
Customer: Not that I can think of
Submitted: 8 months ago.
Category: GM
Expert:  Pete replied 8 months ago.

Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.

Can you tell me where this relay is located just so I can make sure I am looking up the correct info on this here?

Let me know so we can continue,thanks Pete.

Customer: replied 8 months ago.
It plugs into the ignition key assembly.
Expert:  Pete replied 8 months ago.

Is this the electronic ignition switch you are speaking of here that the key rotates or activates?

Customer: replied 8 months ago.
Expert:  Pete replied 8 months ago.

Can you tell me what you are jumping with a wire to make the starter crank?

Customer: replied 8 months ago.
In the fuse box under the Hood there is the relay switch number 47 if you jumper the bottom right to the upper left ( where the relay switch plugs in) it will crank the starter.
Expert:  Pete replied 8 months ago.

O.k.,I'm a little confused here.Did you jump at this relay in the under hood fuse panel or at the key switch in the dash?

Customer: replied 8 months ago.
Under hood fuse panel
Expert:  Pete replied 8 months ago.

O.k.,just wanted to make sure.

Do you have a test light or multi meter to test electrical with at all?

Customer: replied 8 months ago.
Expert:  Pete replied 8 months ago.

O.k.with the relay installed if you tap on it when trying to start the vehicle does it start and run then at all?

Was the actual electronic ignition switch ever tested or replaced?This is the electronic switch that connects to the ignition key cylinder itself.

Let me know,thanks Pete

Customer: replied 8 months ago.
Tapping on it made no difference. Yes that is the switch that I replaced two weeks ago.
Customer: replied 8 months ago.
I had a test light when I was doing the checks earlier, but not with me at this time.
Expert:  Pete replied 8 months ago.

Does it crank over and start in neutral?

Have you checked and made sure IGN E fuse 22 and IGN A fuse 34 are both o.k. in the under hood fuse panel?

Let me know,thanks Pete

Customer: replied 8 months ago.
All fuses are good. No, Putting transmission in neutral makes no difference.
Expert:  Pete replied 8 months ago.

O.k.,we need to see what signal is missing.At this relay with the relay removed you will see the relay is seated into 4 terminals.If you can gain access to a test light test the terminals with the relay removed and let me know what signal is missing.

One terminal should have power at all times key on or off

One terminal should have power with the key on or when cranking

One terminal should have a ground signal only when the key is held in the crank position

Customer: replied 8 months ago.
It'll be a couple of hours before I can get ahold of the test light again.
Expert:  Pete replied 8 months ago.

O.k.,when you repost here I will respond as soon as I can.

Customer: replied 8 months ago.
Ok thanks
Expert:  Pete replied 8 months ago.

No problem

Customer: replied 8 months ago.
Ended up not being any of that. Starter solenoid is bad. Having problems getting the starter out though.
Expert:  Pete replied 8 months ago.

That is great to hear the fault has been located here.Is this the 5.3 liter engine?

Customer: replied 8 months ago.
Expert:  Pete replied 8 months ago.

Below is the procedure on how to replace this starter.It is a pain to access and replace unfortunately.


1. Disconnect the negative battery cable.
2. Raise and suitably support the vehicle.

3. Remove the rear steering gear crossmember.
4. Remove the wire harness from the wire harness retaining clips on the transmission oil cooler line bracket.

5. Remove the transmission oil cooler line bracket bolt.

6. Remove the right transmission cover bolt.

7. Remove the starter bolts.
8. Move the starter toward the front of the vehicle, and remove the transmission cover.
9. Remove the starter solenoid heat shield.
10. Tilt and rotate the starter in order to pass the starter between the transmission oil cooler lines and the engine oil pan.

11. Remove the starter solenoid nut (2).
12. Remove the starter lead (1) from the solenoid stud.

13. Remove the battery positive cable nut (2).
14. Remove the battery positive cable (1) from the starter solenoid.
15. Finish removing the starter from the vehicle.

Installation is the reverse.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service,your 5 star rating is appreciated.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

Customer: replied 8 months ago.
Already replaced it yesterday. But thanks anyhow.
Expert:  Pete replied 8 months ago.

O.k.,I hope my info has helped here with the testing and anything else I provided.If you need anything else let me know.

Let me know if you need anything else and feel free to rate my help here as this is how I receive credit for my time.Your 5 star rating is appreciated

Thanks Pete