20 Most Recent 2009 GMC Yukon XL - Page 9 Questions & Answers

There is a service bulliten on this and you will need to check on the ground for the ecbm or body control module. Here is the meat and potatyoes of the bulliten.
2000-2006 GMC Yukon, Yukon Denali, Yukon XL

DO NOT REPLACE THE BRAKE MODULE.

Perform the following steps to improve the connection of the EBCM Ground:

Remove the EBCM Ground. The EBCM Ground is located on the frame beneath the driver's side door. If multiple grounds are found in this location, the EBCM ground can be identified as the heavy (12-gauge) wire.
Clean the area, front and back, using a Whiz Wheel®.
Install the ground, then the washer and then the bolt to the frame.
Important: It is important to use the bolts, washers and nuts specified in this bulletin. These parts have been identified due to their conductive finish.

Install a washer and nut to the back side of the frame.
Tighten
Tighten the nut to 9 N·m (79 lb in).

Cover the front and back side of the repair area using Rubberized Undercoating.
An additional check can be made to ensure a good connection for the Battery Cable to Frame ground. It is possible for this ground to cause similar symptoms with the ABS as described above.

Hello, and good morning.

I always try and go about fixing or trouble shooting a problem with steps, starting with the cheapest and easiest way to get to the root of the solution.

You have possibly 3 different problems that can cause your description of the symptoms.

Number One, can be as simple as a fuel filter partially clogged, and if that is the case could in combination cause a vapor lock, cause by fuel filter being partially clogged. Solution on that is to replace fuel filter.

Number Two, can be fuel injectors are partially clogged, and can buy a can of injector cleaner at a place like Auto Zone, comes in a can, and has a hose, that you tap right into your intake of injectors, and as GMC is running, you spray this can through a hose and it goes through injectors and cleans the injector ports.

Number Three, and this one is more expensive, and have to have it put on computer to determine which one, sense there is normally 4. What i am talking about, what also cause this problem more often then not, is your 02 Sensor. And, that has to do with your air flow, Cadillac convertor,and other related issue that have to do with 02 Sensors.

I hope this gives you a area of where to start. I feel this will help solve the problem. Thanks Mike

{: ) You didn't mention which vehicle model you have, but anyway, you can start by checking all the HVAC fuses if the blower is not blowing at all at any speed.
A usual fault is the rear blower resistor getting open circuited.
The rear a/c blower may be stucked or open circuited.
A malfunctioning Rear HVAC controller is possible. although rarely the cause.