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My 03 envoy wont stay in 4×4is this because of a vacuum

Posted by Sean Stacy on

  • Carl Rock
    Carl Rock Aug 01, 2020

    Are getting a service 4wd message?



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Jeff Armer

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Which of these does your vehicle have
Transfer Case - NVG 126-NP4
Transfer Case - NVG 226-NP8
Do you know what a RPO code is ? Where it's located on the vehicle ? RPO code NP4 or NP8 will tell you which transfer case your's has . Vacuumn has nothing to do with it . controlled electroniclly . Having a professional scan tool hooked up an DTC'S - diagnostic trouble codes check is what you should do .

The production/process codes provide the description of the Regular Production Options (RPOs) used on the vehicle. The RPO list is printed on the Service Parts Identification Label. The following is a list of the RPO abbreviations and the description of each:
Transfer Case Active Single Speed All Wheel Drive (AWD)
Steering Wheel Leather Wrapped
Steer Column EEC Approved
Transfer Case Active All Wheel Drive (AWD) 2 Speed

SERVICE 4WD indicator
The SERVICE 4WD indicator is an integral part of the cluster and cannot be serviced separately. This lamp is used to inform the driver of the vehicle that a transfer case system malfunction. The SERVICE 4WD indicator is controlled by the transfer case shift control module via Class 2.

Posted on Aug 01, 2020


Andrew Taylor

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2 Answers

My 2003 gmc envoy wont shift out of first gear

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As silly as this might sound, you more than likely disturbed a vacuum line or an electrical connector located near or under the battery. Check around for this and see what you find. If you removed the air intake duct make sure the clamps and connections are tight.

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When my envoy sits overnight my rearend drops down

There has been a service bulletin for that type of concern. Here is what it states.

Suspension - Rear Suspension Is Low/Sagging/Uneven



Bulletin No.: 06-03-09-006B

Date: December 15, 2008
EI06006 - Rear Suspension Uneven, Sagging, Low (Recalibrate Air Spring Sensor)

2006-2007 Buick Rainier
2006-2007 Chevrolet TrailBlazer SS
2006-2007 GMC Envoy, Envoy XL
2006-2007 Saab 9-7X

with Suspension Pkg - Rear Load Leveling (RPO G67)


This bulletin is being revised to update the labor operation in the warranty information. Please discard Corporate Bulletin Number 06-03-09-006A (Section 03 - Suspension).


Some customers may comment on the rear suspension being uneven or sagging.



Based on technician feedback, engineering has determined that the customer's concern can be corrected by recalibrating the air spring sensor. Refer to the Trim Height Uneven or Low diagnostics and Air Spring Sensor Calibration procedure found in SI.

Nov 29, 2011 | 2004 GMC Envoy

2 Answers

03 GMC envoy..wont start all lights are on..battery is good starter relay is good..starter doesnt click or anything

Try giving the starter a whack with a hammer or end of broomstick if it tries or goes, replace the starter

Jan 22, 2011 | 2003 GMC Envoy

1 Answer

On my 03 envoy 4x4 slt, my service 4wd light came on and of course i can't shift into 4 wheel. what is the most!!!! likely problem? thank-you.

vaccum actuator on the frontend is malfunctioning... check the electronic connection, as well as the vaccume hose running to it, if its cracked, or unhooked it wont engauge in 4 wd.. these actuators are terrible with this problem.. hope this helps you.

Dec 08, 2010 | 2003 GMC Envoy

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03 GMC Envoy the abs light stays on. The pads and rotors all around are brand new.

Have your ABS Wheel Sensor checked, it is mounted on the hub of your axle. it could have gotten dirt on it or it is bad and it is not giving a signal to the ABS Module.

Jun 13, 2010 | 2003 GMC Envoy

2 Answers

Rough Idle while stopped and low speeds

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1 Answer

2004 Envoy tach runs high

Common issue with the 03-06 Envoy instrument clusters, it's caused by failing stepper motors on the cluster's circuit board and it can be fixed. Check out this page for more on how to get it fixed - Envoy tachometer fix

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