2006 GMC Yukon Denali Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2006 GMC Yukon Denali

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2006 GMC Yukon Denali Problems

Overheating and/or Coolant Loss Due to Leaking Quick-Connect Fitting

The quick-connect fittings for the heater hoses tend to leak engine coolant. This problem commonly occurs because the metal housing has become brittle, which can break and cause leaks.

"No start" due to anti-theft system failure
The anti-theft system may fail causing a no start condition, the security light may illuminate. Our technicians tell us that the ignition switch may need to be replaced to correct this fault.
Instrument Panel Lights Flickering and Exterior Lights Intermittent

The headlight switch used on the GMC Yukon Denali is known to fail through normal operation. Since the headlight switch is also integrated into the interior lights, a malfunctioning switch can cause issues with interior lights as well.

  • Symptoms of a failed headlight switch include:
  • Headlights and taillights failing to turn on or off
  • Interior lights flicker, or fail to turn on or off
  • Gauge cluster lighting off or flickering with headlights on
  • Parking light malfunctions  

This issue is well known with General Motors Trucks and SUVs, and is solved by testing and, if needed, replacing the headlight/dimmer switch. Bad grounding wires at the tail-lights, and dirty/corroded tow package wires can also lead to some of these issues. 

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2006 GMC Yukon Denali Reviews

Rated
based on 3 customer reviews
I've had the vehicle for six months. It just went through its first inspection and it only needed tie rods. I consistently have check engine light issues with the gas cap and others that I am unaware of however the truck runs great. I recently installed an "innovative" power performance chip and you can definitely feel the boost . Has anyone installed a performance air intake system, if so i...
Sturdy vehicle, my biggest complaint is the ac.
Starter went 2x, heat doesn't work in back, heat went in the front this winter (on again off again), trim around sunroof falling apart, front seat makes odd noises when moving forward/back - I swear it was new! I have 54k miles and $15,500 left to pay. Any takers?

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