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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 29427
Experience:  GM Grand Master Technician 2007. 14 year experience.
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Working on 2006 gmc envoy xl 4.2L. when you turn key

Customer Question

working on 2006 gmc envoy xl 4.2L. when you turn key sometimes engine turns over but will not fire up sometimes when you turn key you get nothing. we replaced ignition switch in steering column but did no good. any suggestion would be appreciated.
Submitted: 1 year ago.
Category: GMC
Expert:  Gm Tech (Cam) replied 1 year ago.

Hi there, I am Cam. Can I get your name please? When you say you turn the key and get nothing, you mean no lights on the dash or anything?

Customer: replied 1 year ago.
my name Lewis. we do get lights in dash and headlight, but engine will not turn over.
Expert:  Gm Tech (Cam) replied 1 year ago.

Ok Lewis, specifically do you get the check engine light?

Customer: replied 1 year ago.
Customer: replied 1 year ago.
I do
Expert:  Gm Tech (Cam) replied 1 year ago.

OK, Does it ever flash a security light or not show the gear position when this happens?

Customer: replied 1 year ago.
no
Customer: replied 1 year ago.
when you cut key on everything lights up on dash but you do not hear fuel pump or anything else even if it does turn over
Expert:  Gm Tech (Cam) replied 1 year ago.

Were there any repairs prior to this issue? IT does sound strange, possibly a ground wire or even an Powertrain Control Module (PCM)

Customer: replied 1 year ago.
not that we know of. customer didn't offer
Expert:  Gm Tech (Cam) replied 1 year ago.

Ok, your a shop, So then you have a scan tool? I would like to know if the modes match when watching the mode master status in the Body Control Module (BCM).

Customer: replied 1 year ago.
our scan tool is out of use
Expert:  Gm Tech (Cam) replied 1 year ago.

OK, we need to see what codes and data are being sent. IF you had it never turning over then I would look to a starter, and that may be worth looking at without codes or data. Can you check power at the starter terminal in start?

Customer: replied 1 year ago.
no problem with starter. Have already checked.
Expert:  Gm Tech (Cam) replied 1 year ago.

Then we need data. I hate to default to that, but its an electronically controlled system.

Customer: replied 1 year ago.
ok thanks
Expert:  Gm Tech (Cam) replied 1 year ago.

Is there more I can get you at the moment?

Customer: replied 1 year ago.
no thanks
Expert:  Gm Tech (Cam) replied 1 year ago.

Thank you. If you need more, please reply back to me. Thank you for allowing me to assist you. Please rate my answer OK to Excellent service and feel free to ask any follow up questions regarding this issue you may have.
Please know that the only compensation for my time spent assisting you is when you provide that rating.

Customer: replied 1 year ago.
ok
Expert:  Gm Tech (Cam) replied 1 year ago.

Thanks.