2004 GMC Sierra Denali: common problems

Owners of the 2004 GMC Sierra Denali filed 11 complaints with NHTSA, most often about service brakes and electrical system. Details by component below, with sources.

Key figures

Owner complaints: 11
involving a crash: 1

What fails most often

1 Service brakes 45% of all complaints
2 Electrical system 18% of all complaints
3 Air bags 9% of all complaints
4 Engine and cooling 9% of all complaints
5 Powertrain 9% of all complaints
6 Seat belts 9% of all complaints
7 Steering 9% of all complaints
8 Suspension 9% 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: 5 complaints (45% of all).
Electrical system: 2 complaints (18% of all).
Air bags: 1 complaints (9% of all), 1 of them with a crash reported by the owner.
Engine and cooling: 1 complaints (9% of all).
Powertrain: 1 complaints (9% of all).

Symptoms owners describe

How many of the 11 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).

rust, corrosion3 · 27%
airbags did not deploy1 · 9%
brake failure1 · 9%
seat belts1 · 9%
steering or power steering problems1 · 9%
tires: bulges, blowouts1 · 9%
warning lights, check engine1 · 9%

Components owners complain about

Component	Owner complaints	involving a crash
Service brakes	5	0
Electrical system	2	0
Air bags	1	1
Engine and cooling	1	0
Powertrain	1	0
Seat belts	1	1
Steering	1	0
Suspension	1	0
Tires	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.

Consumer's vehicle was involved in an a roll over, and the air bags did not deploy. Also, seat belts did not secure the occupants. The driver was under the steering wheel, and the passenger was under the dashboard.
Air bags · crash · 2004-11-30 · NHTSA complaint #10101826
Once that happens, the rear calipers lock up and there are no brakes at all switch can cause a crash. There is no warning given until the hydraulic line snaps and the fluid is released. My truck has never been in an accident and has low mileage for its age.
Service brakes · 2014-07-17 · NHTSA complaint #10611180
The contact stated while traveling approximately 5 mph, the brake pedal was able to be fully depressed and the brake warning light illuminated. The vehicle was towed to the dealer where it was found that the brake lines were corroded. The contact also mentioned that the failure was experienced twice.
Service brakes · 2013-08-07 · NHTSA complaint #10534022
2004 gmc sierra 6 liter v8 - exhaust manifold bolts broken off - $600 to repair. Design and/or part defect. Dealer said this happens. Recall or have gm correct?
Engine and cooling · 2011-07-14 · NHTSA complaint #10412314
The problem was that the cords in the front goodyear wrangler hp tire had separated--it was a blowout waiting to happen. I did not hit anything with my truck to have caused the separation, the tread wear was even on all tires, they were regularly checked for inflation, and most of the tread was left since I have put…
Tires · 2010-02-04 · NHTSA complaint #10306123
Instrument cluster malfunctions. Speedometer flutters and displays wrong speed. Gets stuck.
Electrical system · 2007-11-12 · NHTSA complaint #10208673
Speedometer malfunctions. Goes to 120 then 0. Stays at 0. Stops working. Skips around.
Electrical system · 2007-03-19 · NHTSA complaint #10185558
I am experiencing the exact problem that is described regarding the recall of gmc light trucks for abs activation at slow speeds due to corrosion of the hub and wheel assembly. I have a 2004 gmc sierra denali which, according to gmc, is not included in the massive recall prompted by your investigation.
Service brakes · 2007-03-06 · NHTSA complaint #10184356

When owners complained

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

20041
20051
20074
20101
20111
20121
20131
20141

Comparison

By complaint count this model year ranks 10,520 of 36,656 model years in the NHTSA data (top 29% most complained about).

On average one model year of the Sierra Denali has 14 complaints (18 years in the data). This year has 11, below average.

What to check before buying

Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
Air bags. Check the SRS light, stored codes and airbag/curtain status after any impact.
Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.

Other years of this model

Questions and answers

What are the most common problems with the 2004 GMC Sierra Denali?

Owner complaints to NHTSA most often mention: service brakes, electrical system, air bags. Total complaints: 11. The most frequent symptoms in complaint texts: rust, corrosion (27%), airbags did not deploy (9%), brake failure (9%).

How many service bulletins (TSB) were issued for the 2004 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 2004 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 2004 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.