SPONSORED LINKS

I have a problem only with 4-wheel Low?

Tiny
STEVE620
  • MEMBER
  • 2007 GMC ENVOY
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 190,500 MILES
I do not use my 4-wheel drive except for snow that we just had. I think I have a problem only with 4-wheel Low going forward. When I engage it seems like it's slipping at first, I can see hear it then works like I think it should. Backwards no problem and there is a big difference going backwards. I dropped it off at dealership and they told me it's working flawlessly I still have my doubts, what do you think before I take it elsewhere also before I took it in the dash light with the wrench and 4D service light was on and of course the light was out. And while driving it in the snow the selector knob light would not change until I would restart engine. Sorry if I'm all over the place here but as I remember I'm typing.
Thank you
SPONSORED LINKS
Wednesday, January 24th, 2024 AT 7:27 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
Hi Steve, with the wrench light on it should have trouble codes stored. let's go over this guide to retrieve the codes:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

To me it sounds like the transfer case encoder motor is getting weak and not commanding the shift fork inside. Here is how to change it out. Check out the images (below). Please let us know what happens.
Images (Click to make bigger)
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
+1
Wednesday, January 24th, 2024 AT 12:26 PM
Tiny
STEVE620
  • MEMBER
  • 64 POSTS
I just used a code reader and I'm not getting any codes.
Was this
answer
helpful?
Yes
No
Thursday, January 25th, 2024 AT 6:49 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
Okay, I know a weak encoder motor can cause the transmission case not to shift correctly but I have also seen internal damage to the transfer case cause this problem as well. You might be able to remove the encoder motor and shift the transfer case by hand, or you can activate the motor once it is out of the case to see how it responds.
Was this
answer
helpful?
Yes
No
Friday, January 26th, 2024 AT 10:40 AM
Tiny
STEVE620
  • MEMBER
  • 64 POSTS
Right now, the 4-wheel drive is working. When this first started to happen, I checked it with a code, and I just remembered the code I got was P0650.
Was this
answer
helpful?
Yes
No
Friday, January 26th, 2024 AT 1:56 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
The P0650 code in a 2007 GMC Envoy is a diagnostic trouble code (DTC) related to the vehicle's Malfunction Indicator Lamp (MIL) control circuit.

So, I don't think this will cause an issue with the 4wd. Does the check engine light come on with the key?
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Saturday, January 27th, 2024 AT 10:41 AM
Tiny
STEVE620
  • MEMBER
  • 64 POSTS
No lights are showing on dash and 4-wheel drive is working, everything looks normal. I will have to wait till another snow fall to see what happens.
Thank you
Was this
answer
helpful?
Yes
No
Saturday, January 27th, 2024 AT 11:51 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
Sounds good, please let me know. We should check all fuses with the key on, this guide can help:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Here are the fuse locations. Check out the images (below). Please let us know what happens.

Images (Click to make bigger)
Thumb
Thumb
Was this
answer
helpful?
Yes
No
Sunday, January 28th, 2024 AT 10:37 AM

Please login or register to post a reply.

Related Service Light Content

VIEW MORE

Sponsored links