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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 27664
Experience:  GM Grand Master Technician 2007. 11 year experience.
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GMC Envoy SLT: My 2002 GMC Envoy wont shift to drive and the

Resolved Question:

My 2002 GMC Envoy wont shift to drive and the key is stuck in the ignition after you turn the key off i have replaced the Electronic ignition relay and that didnt do anything what else could it be.
Submitted: 2 years ago.
Category: GMC
Expert:  Gm Tech (Cam) replied 2 years ago.

Gm Tech (Cam) :

Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.

Gm Tech (Cam) :

Is the transmission fully in park?

Customer:

i have pushe the shhifter all the way up and the console says its in park

Gm Tech (Cam) :

OK, did it feel normal when you shifted to park?

Customer:

yes nothing felt odd and the transmission when put in drive is sluggish to start out its almost like its not there.

Gm Tech (Cam) :

Is the check engine light on?

Customer:

yes it is i did ask you guys what the problem was before and thats why i changed out the electronic relay.

Gm Tech (Cam) :

what codes are set?

Gm Tech (Cam) :

This could be the ignition switch itself,

Customer:

what do you mean by codes how do i found out codes

Gm Tech (Cam) :

this is done with a scan tool and most parts stores will scan for free.

Customer:

there is that little button on the colunm that releases the key i use that to get the key out and i do have a scan tool but i plugged it in and it doesnt turn on to read any codes

Gm Tech (Cam) :

Check the CIGAR fuse for the scan tool not powering up.

Customer:

the button of course is under the cover of the steering colunm

Customer:

ok

Gm Tech (Cam) :

yes, it is the manual release.

Customer:

but the ignition switch isnt going to screw up the gearing in the transmission is it

Customer:

the ignition switch isnt going to screw up the shifting though is it

Gm Tech (Cam) :

yes!!

Gm Tech (Cam) :

these operate on a ground signal.

Customer:

sorry computer screwed up

Gm Tech (Cam) :

THe ignition sends power to the transmission directly then the Powertrain Control Module (PCM) provides the ground to operate the valve. It is a VERY common issue on these vehicles, bad contacts in the ignition switch

Customer:

so not the relay like i was told before

Customer:

its the switch itself

Gm Tech (Cam) :

that is one very likely issue, yes.

Customer:

ok well the cigar lighter doesnt work so i will find the fuse and replace it so i can get codes

Gm Tech (Cam) :

ok

Customer:

it will tell me if the ignition switch is out

Customer:

the codes i mean

Gm Tech (Cam) :

If you get codes like P0753, P0758, P1810 , then yes it is the switch

Customer:

i have to run to he store for a new mini fuse

Gm Tech (Cam) :

ok

Customer:

i have codes P0758,P0740,P0753,P1860

Gm Tech (Cam) :

Those are the codes.

Customer:

so does this mean that i have all these problems

Gm Tech (Cam) :

Simple test, take the lower trim off the steering column, use a wire to jump the red to the white wire, both thick in the switch and see what happens

Customer:

with the cat on or off

Customer:

car

Gm Tech (Cam) :

on ,

Customer:

one minute

Gm Tech (Cam) :

and see what happens, see how it drives.

Customer:

do i clear the codes

Customer:

first

Customer:

ok

Gm Tech (Cam) :

no, it does not matter. When power is back it will shift .

Customer:

before i drive the service light is still on is that ok

Gm Tech (Cam) :

yes, that is fine.

Customer:

ok

Gm Tech (Cam) :

.

Customer:

ok it seems to drive normally i couldnt really get up to 55 but it seemed to shift

Gm Tech (Cam) :

Replace the ignition switch then to correct this.

Gm Tech (Cam) :

Does the key come out of the column now?

Customer:

ok is it pretty hard to do or should i have a certified mechanic do it

Customer:

no the key does not

Gm Tech (Cam) :

It is not bad.

Gm Tech (Cam) :

As for the key, that is liekly the wiring into the side of the shifter under the console. It breaks from the movement of the shifter.

Gm Tech (Cam) :

Why these happened at the same time is hard to say.

Customer:

but could i have the timing off in the ignition with the relay i switched out

Gm Tech (Cam) :

what relay?

Gm Tech (Cam) :

If you slide the switch out then you could have changed the timing.

Customer:

the electronic relay that goes into the ignition

Gm Tech (Cam) :

In the column?

Customer:

but would that not let the key out

Customer:

yes in the column

Gm Tech (Cam) :

Do you have a part number?

Customer:

of the relay

Gm Tech (Cam) :

yes, pelase.

Gm Tech (Cam) :

please.

Customer:

2139 2037

Customer:

or 04 1591 00

Customer:

12450251

Customer: NNN-NN-NNNNsorry
Gm Tech (Cam) :

So the igntion switch itself, not a relay.

Customer:

yes i mean not the part the key goes into

Gm Tech (Cam) :

Strange then that you have those codes now and it does not shift. Sounds like a faulty switch. Timing could be an issue, but then does it crank properly in start position?

Gm Tech (Cam) :

That is the cylinder,

Customer:

yes but it doesnt have like three turns like normal i mean one turn elcet turns (acc) then it turn the ignition

Customer:

when you turn it off it doesnt go any further

Customer:

it dor\es snap back after turning the key on

Gm Tech (Cam) :

Ok, use THIS DOCUMENT to remove and install the switch timed correctly.

Customer:

ok

Gm Tech (Cam) :

.

Customer:

ok thank you

Gm Tech (Cam) :

Please bookmark this page so you can easily navigate back to it so we can continue the discussion. You can reply at any time for follow up information regarding this issue, even after you accept my answer and I will reply. Please don't forget to click accept at some time as that is my only means of compensation for assisting you.

Customer:

Would putting this in my favorites do the same as bookmarking it? (this is his wife)

Gm Tech (Cam) :

yes, that is exactly it

Customer:

Great! thank you. He is out installing the piece now

Gm Tech (Cam) :

ok

Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 27664
Experience: GM Grand Master Technician 2007. 11 year experience.
Gm Tech (Cam) and 5 other GMC Specialists are ready to help you

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