GMC Sierra 1500 1999–2006
1st generation Sierra (GMT800)
NHTSA data through 13 August 20261,623 complaints, 1,412 with mileageMethod
- Reports with mileage
- 1,412
- Median of reported failures
- 76,000 mi
- Most-reported system
- Hydraulic brake circuit (24.2%)
- Recalls
- 0
Before-you-buy checklist ↓Check this VIN — NHTSA ↗
On this generation, failures are spread across the mileage range, with the middle half between 47,982 and 115,000 miles.
Figure 1 · GMC Sierra 1500 1999–2006 · 1,412 reports with mileage
Mileage at failure
Complaints per 5,000-mile bin, 0 to 200,000 miles, equal bins on a linear scale. Tallest bar = 73 complaints.
- Rest of the range
- Median
- 200,000+ — 63 complaints (4.5%), plotted separately
- 10%
- 24,000
- 25%
- 47,982
- Median
- 76,079
- 75%
- 115,000
- 90%
- 164,363
Show the numbers
| Mileage | Complaints | Share |
|---|---|---|
| 0–5,000 | 48 | 3.4% |
| 5,000–10,000 | 15 | 1.1% |
| 10,000–15,000 | 27 | 1.9% |
| 15,000–20,000 | 32 | 2.3% |
| 20,000–25,000 | 26 | 1.8% |
| 25,000–30,000 | 40 | 2.8% |
| 30,000–35,000 | 34 | 2.4% |
| 35,000–40,000 | 43 | 3.0% |
| 40,000–45,000 | 55 | 3.9% |
| 45,000–50,000 | 49 | 3.5% |
| 50,000–55,000 | 60 | 4.2% |
| 55,000–60,000 | 49 | 3.5% |
| 60,000–65,000 | 73 | 5.2% |
| 65,000–70,000 | 60 | 4.2% |
| 70,000–75,000 | 70 | 5.0% |
| 75,000–80,000 | 61 | 4.3% |
| 80,000–85,000 | 65 | 4.6% |
| 85,000–90,000 | 49 | 3.5% |
| 90,000–95,000 | 40 | 2.8% |
| 95,000–100,000 | 48 | 3.4% |
| 100,000–105,000 | 50 | 3.5% |
| 105,000–110,000 | 32 | 2.3% |
| 110,000–115,000 | 29 | 2.1% |
| 115,000–120,000 | 34 | 2.4% |
| 120,000–125,000 | 30 | 2.1% |
| 125,000–130,000 | 17 | 1.2% |
| 130,000–135,000 | 31 | 2.2% |
| 135,000–140,000 | 20 | 1.4% |
| 140,000–145,000 | 17 | 1.2% |
| 145,000–150,000 | 17 | 1.2% |
| 150,000–155,000 | 28 | 2.0% |
| 155,000–160,000 | 16 | 1.1% |
| 160,000–165,000 | 8 | 0.6% |
| 165,000–170,000 | 9 | 0.6% |
| 170,000–175,000 | 18 | 1.3% |
| 175,000–180,000 | 10 | 0.7% |
| 180,000–185,000 | 9 | 0.6% |
| 185,000–190,000 | 10 | 0.7% |
| 190,000–195,000 | 8 | 0.6% |
| 195,000–200,000 | 12 | 0.8% |
| 200,000+ | 63 | 4.5% |
Source: NHTSA Office of Defects Investigation, public domain. Complaint counts reflect what owners reported and are not a measure of failure rate per vehicle sold.
What this can and cannot tell you: these are complaints owners chose to file, not a failure rate. Popular models accumulate more of them simply by being common. How this is built.
Owners filed 1,623 complaints with NHTSA about the 1999–2006 GMC Sierra 1500, and 1,412 of them record the mileage at which the failure happened. That is enough to show not just what fails, but when.
Failures are spread across the mileage range, with the middle half between 47,982 and 115,000 miles. The median is 76,079 miles.
The most-reported areas are the hydraulic brake circuit (24.2% of complaints, typically around 70,000 miles), the brakes (21.3% of complaints, typically around 100,000 miles), the electrical system (14.5% of complaints, typically around 67,000 miles).
If you arrived asking “is it reliable?” — this page answers the version of that question the data can support: which problems owners reported, and at what mileage.
How many miles does a 1999–2006 GMC Sierra 1500 last?
Half of the failure reports on the 1999–2006 GMC Sierra 1500 were filed by 76,000 miles and 90% by 164,000 miles — figures drawn from 1,412 NHTSA complaints that record an odometer reading, so they time reported failures, not the cars whose owners never filed one.
63 reports (4.5%) came in past 200,000 miles — each one proof a Sierra 1500 reached that mileage, not that it died there.
Before you buy a 1999–2006 Sierra 1500: the 3-minute check
Generated from 1,412 mileage-tagged complaints, 4 documented problem areas. Print this page — the checklist survives print.
- Check instrument cluster on 2003–2006 cars. Instrument cluster stepper motor (gauge motor) failure causing erratic, sticking or dead speedometer, tachometer and fuel gauge. So widespread GM issued a warranty extension on the cluster.
- Check transmission. 4L60-E / 4L65-E 3-4 clutch pack failure producing slipping on the 3-4 shift and eventual loss of drive.
- Check fuel system. Fuel level sending unit failure from sulfur deposits on the sender card, giving false or stuck fuel readings.
- End with a pre-purchase inspection of this car. Aggregate data describes the population; the example in front of you has its own history.
For a buyer, failures on this generation are spread rather than concentrated: the middle half falls between 48,000 and 115,000 miles, with a median of 76,000. There is no single mileage threshold to watch, which means condition and maintenance records are more informative than the odometer.
On inspection, the hydraulic brake circuit and the brakes are where this generation's reports concentrate, so those are the areas worth a specific look. The hydraulic brake circuit in particular shows a median failure mileage of 70,000, which gives a concrete number to compare against the odometer of any car you are considering.
None of this is a substitute for a pre-purchase inspection on the individual car. Aggregate patterns describe a population; the example in front of you has its own history.
What fails, and when
Figure 2 · GMC Sierra 1500 1999–2006
When each system fails
Bar spans the middle half of reports; the notch inside each bar is the median. Miles at failure on a proportional scale — equal distances are equal ratios, not equal miles.
- Steering75 reports51,00018,000–90,000Steering: 75 reports, median 51,000 miles, middle half 18,000 to 90,000 miles.
- Transmission and driveline60 reports60,00018,000–110,000Transmission and driveline: 60 reports, median 60,000 miles, middle half 18,000 to 110,000 miles.
- Electrical system236 reports67,00047,000–90,000Electrical system: 236 reports, median 67,000 miles, middle half 47,000 to 90,000 miles.
- Hydraulic brake circuit393 reports70,00042,000–99,000Hydraulic brake circuit: 393 reports, median 70,000 miles, middle half 42,000 to 99,000 miles.
- Body structure50 reports86,00060,000–139,000Body structure: 50 reports, median 86,000 miles, middle half 60,000 to 139,000 miles.
- Airbag system55 reports100,00052,000–155,000Airbag system: 55 reports, median 100,000 miles, middle half 52,000 to 155,000 miles.
- Brakes345 reports100,00070,000–135,000Brakes: 345 reports, median 100,000 miles, middle half 70,000 to 135,000 miles.
- Your odometer — appears after you enter it in “Where your car sits”
Ordered by median mileage, earliest first. The first 12,000 miles are shaded: that is the boundary this site uses between a manufacturing defect and ordinary wear, not a property of the world.
Source: NHTSA Office of Defects Investigation, public domain.
| System | Complaints | Share | Median | 25–75% |
|---|---|---|---|---|
| Hydraulic brake circuit | 393 | 24.2% | 70,000 | 42,000–99,000 |
| Brakes | 345 | 21.3% | 100,000 | 70,000–135,000 |
| Electrical system | 236 | 14.5% | 67,000 | 47,000–90,000 |
| Steering | 75 | 4.6% | 51,000 | 18,000–90,000 |
| Transmission and driveline | 60 | 3.7% | 60,000 | 18,000–110,000 |
| Airbag system | 55 | 3.4% | 100,000 | 52,000–155,000 |
| Body structure | 50 | 3.1% | 86,000 | 60,000–139,000 |
| Suspension | 45 | 2.8% | 70,000 | 25,000–106,000 |
| Parking brake | 38 | 2.3% | 55,000 | 24,000–108,000 |
| Fuel system | 38 | 2.3% | 75,000 | 48,000–100,000 |
Where your car sits
Failure reports by the odometer reading they were filed at. Pick the anchor nearest your car — or type the exact mileage: your marker lands on this curve and on the timing chart above.
Figure 3 · GMC Sierra 1500 1999–2006 · 1,412 reports with mileage
Share of reports below each mileage
Share of mileage-tagged reports filed at or below each odometer reading. Steps rise only at bin edges, by exact counted shares.
- 60,000 mi — 34% of reports below
- 90,000 mi — 61% of reports below
- 120,000 mi — 77% of reports below
- Median — the staircase crosses the 50% line here
- Your odometer — appears after you enter it below
The staircase tops out at 96%: the remaining 4.5% of reports (63) came above 200,000 miles.
Nothing is smoothed or interpolated. Linear axis, same as Figure 1.
Source: NHTSA Office of Defects Investigation, public domain.
At 60,000 miles
34% of the failure reports on this generation came below this mileage. That describes reports, not your odds.
In the reporting window
- Hydraulic brake circuit — middle half 42,000–99,000 mi
- Electrical system — middle half 47,000–90,000 mi
- Steering — middle half 18,000–90,000 mi
- Transmission and driveline — middle half 18,000–110,000 mi
- Airbag system — middle half 52,000–155,000 mi
- Body structure — middle half 60,000–139,000 mi
Mostly reported later
- Brakes — middle half 70,000–135,000 mi
At 90,000 miles
61% of the failure reports on this generation came below this mileage. That describes reports, not your odds.
Reported earlier than this mileage — ask for repair records
- Electrical system — median 67,000 mi
- Steering — median 51,000 mi
In the reporting window
- Hydraulic brake circuit — middle half 42,000–99,000 mi
- Brakes — middle half 70,000–135,000 mi
- Transmission and driveline — middle half 18,000–110,000 mi
- Airbag system — middle half 52,000–155,000 mi
- Body structure — middle half 60,000–139,000 mi
At 120,000 miles
77% of the failure reports on this generation came below this mileage. That describes reports, not your odds.
Reported earlier than this mileage — ask for repair records
- Hydraulic brake circuit — median 70,000 mi
- Electrical system — median 67,000 mi
- Steering — median 51,000 mi
- Transmission and driveline — median 60,000 mi
In the reporting window
- Brakes — middle half 70,000–135,000 mi
- Airbag system — middle half 52,000–155,000 mi
- Body structure — middle half 60,000–139,000 mi
Which systems, and when
Complaints about this generation are not spread evenly across the vehicle, and the systems that generate the most of them do not all fail at the same point in a car's life. The median failure across all systems here is 76,079 miles; the figures below show which parts of the car run ahead of that and which run behind.
The hydraulic brake circuit accounts for 24.2% of complaints (393 reports, 355 of them with a mileage figure), with a median of 70,000 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 42,000 and 99,000 miles.
The brakes account for 21.3% of complaints (345 reports, 323 of them with a mileage figure), with a median of 100,000 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 70,000 and 135,000 miles.
The electrical system accounts for 14.5% of complaints (236 reports, 201 of them with a mileage figure), with a median of 67,000 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 47,000 and 90,000 miles.
The steering accounts for 4.6% of complaints (75 reports, 63 of them with a mileage figure), with a median of 51,000 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 18,000 and 90,000 miles.
The transmission and driveline accounts for 3.7% of complaints (60 reports, 55 of them with a mileage figure), with a median of 60,000 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 18,000 and 110,000 miles.
The airbag system accounts for 3.4% of complaints (55 reports, 42 of them with a mileage figure), with a median of 100,000 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 52,000 and 155,000 miles.
Differences between model years
Within this generation, complaint volume is not constant across model years. The 2004 model year drew the most — 253 complaints — while 2001 drew the fewest at 171. The median year sits at 201.
Recalls and what they cover
No recall campaigns covering this generation appear in NHTSA's post-2010 recall file. That is not the same as an absence of problems — recalls address safety defects specifically, and many of the complaints above concern faults that are expensive or annoying without meeting that threshold.
Reported severity
What owners reported alongside the failure itself, out of 1,623 complaints against this generation:
- Crashes
- 104 (6.4%)
- Fires
- 27
- Injury reports
- 48
- Fatality reports
- 2
These flags are self-reported by complainants and unverified by NHTSA; one report can carry several flags, so the counts overlap and do not sum to a total. They are not adjusted for how many of these vehicles are on the road. No chart is drawn here on purpose: overlapping counts spanning very different magnitudes cannot be honestly encoded as lengths.
Documented problems
Instrument Cluster 2003–2006
Instrument cluster stepper motor (gauge motor) failure causing erratic, sticking or dead speedometer, tachometer and fuel gauge. So widespread GM issued a warranty extension on the cluster.
Transmission
4L60-E / 4L65-E 3-4 clutch pack failure producing slipping on the 3-4 shift and eventual loss of drive.
Fuel System
Fuel level sending unit failure from sulfur deposits on the sender card, giving false or stuck fuel readings.
Drivetrain
Transfer case encoder motor failure on 4WD/AWD models causing shift-mode failure and stuck-in-neutral conditions.
By model year
| Year | Complaints | With mileage |
|---|---|---|
| 1999 | 182 | 144 |
| 2000 | 215 | 183 |
| 2001 | 171 | 148 |
| 2002 | 192 | 172 |
| 2003 | 210 | 184 |
| 2004 | 253 | 224 |
| 2005 | 218 | 194 |
| 2006 | 182 | 163 |
What owners reported
The seat latches that hold the seats in place which are made of plastic break and the seat slides back and forth (all the way back and all the way forward toward the steering wheel). The latches on my 1999 GMC sierra pick up truck broke in 2000 when the truck only had about 3700 miles on it. GMC corp. Has denied the…
1999 · 3,500 miles · Seats
The first time i bought the vehicle it overflowed fuel when i filled the fuel tank to it's capacity. I assumed a vent line was loose, but knew it would be a big job to drop the fuel tank and check, so i just limited the amount of fuel i would fill the tank with. On jan 5, 2007, the fuel pump quit working and after…
1999 · 8,500 miles · Fuel system
the contact owns a 1999 GMC sierra extended cab. He received a recall notice from the manufacturer to repair and replace the driver and passenger side seat belt. The recall repair was completed 06/21/06 and stated that the seat belts worked for two months. On 08/2006 the driver side seat belt failed. The contact is…
1999 · 15,000 miles · Seat belts
the contact owns a 1999 GMC Sierra 1500. While driving 40 MPH, the vehicle failed to stop when the brakes were depressed. The vehicle came to a stop approximately 200 feet after the brakes were applied. The mechanic stated that the front brake lines were rusted and he replaced the brake lines. There have been no other…
1999 · 17,000 miles · Hydraulic brake circuit
Built from 1,412 NHTSA complaints with mileage · snapshot 2026-08-18 · open data · reproduce this page