2006 GMC Sierra Denali: common problems

Owners of the 2006 GMC Sierra Denali filed 5 complaints with NHTSA, most often about service brakes and fuel system. Details by component below, with sources.

Key figures

Owner complaints: 5
involving a crash: 1

What fails most often

1 Service brakes 40% of all complaints
2 Fuel system 20% of all complaints
3 Powertrain 20% of all complaints
4 Steering 20% of all complaints

Circle size and colour show each component’s share of NHTSA complaints. Schematic only, not a drawing of the exact model.

Service brakes: 2 complaints (40% of all), 1 of them with a crash reported by the owner.
Fuel system: 1 complaints (20% of all).
Powertrain: 1 complaints (20% of all).
Steering: 1 complaints (20% of all).

Symptoms owners describe

How many of the 5 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).

rust, corrosion1 · 20%
vibration1 · 20%
warning lights, check engine1 · 20%

Components owners complain about

Component	Owner complaints	involving a crash
Service brakes	2	1
Fuel system	1	0
Powertrain	1	0
Steering	1	0

What owners report

Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.

2006 sierra denali with just over 75,000 miles. With 1/2 block warning and only traveling at a speed of 20mph, I was unable to come to a complete stop. The brake pedal was all of the way to the floor when I ran into a van in the intersection.
Service brakes · crash · 2010-12-22 · NHTSA complaint #10372020
The vin number is coming up as a 2006 gmc savanna on your site safecar.gov under recall lookup by vin. It should be 2006 gmc sierra denali 1500 truck.I would like it corrected if possible so I can see current recalls. Thank you
Steering · 2015-03-16 · NHTSA complaint #10694688
I just don't understand how gm can get away with all of these frame corrosion and brake line corrosion problems without having to fix the problems with there trucks.
Service brakes · 2013-11-12 · NHTSA complaint #10551852
Front differential vibration/noise at 47-70 mph. Internal bearings replaced due to significant metal found on magnetic drain plug. Technician statement "bearings coming apart" stated. Identical complaint with identical repair repeated 4 times within 85,000 miles. First repair occurred at 34,000 miles.
Powertrain · 2012-04-19 · NHTSA complaint #10455746
The contact stated that the check engine light illuminated on the instrument panel while driving approximately 45 mph. The vehicle was taken to an independent repair shop where the contact was informed that the fuel system needed to be repaired.
Fuel system · 2011-05-27 · NHTSA complaint #10402929

When owners complained

NHTSA complaints by filing year. The peak shows at what age the problems show up most.

20101
20111
20121
20131
20151

Comparison

By complaint count this model year ranks 14,282 of 36,656 model years in the NHTSA data (top 39% most complained about).

On average one model year of the Sierra Denali has 14 complaints (18 years in the data). This year has 5, below average.

What to check before buying

Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
Fuel system. Fuel smell, leaks, rough running, fuel-system codes.
Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
Steering. Steering play, power assist, rack and tie rods after a wheel impact.

Other years of this model

Questions and answers

What are the most common problems with the 2006 GMC Sierra Denali?

Owner complaints to NHTSA most often mention: service brakes, fuel system, powertrain. Total complaints: 5. The most frequent symptoms in complaint texts: rust, corrosion (20%), vibration (20%), warning lights, check engine (20%).

How many service bulletins (TSB) were issued for the 2006 GMC Sierra Denali?

NHTSA lists 0 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.

Should I buy a 2006 GMC Sierra Denali from a US auction?

Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.

Other 2006 models

Read also

Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-05.