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GMC Sonoma - Problems, Statistics, and Analysis



GMC Sonoma owners have reported 1,035 problems for their cars built in the 10 model years listed in the chart below. The chart shows the number of problems reported during all service years for each model year of GMC Sonoma. The 1998 GMC Sonoma cars have the most problems reported (199 problems).

Table 1. Total number of problems by model year for GMC Sonoma

Model Year Number of Problems
  2005 Sonoma
1
  2004 Sonoma
1
  2003 Sonoma
55
  2002 Sonoma
73
  2001 Sonoma
103
  2000 Sonoma
176
  1999 Sonoma
76
  1998 Sonoma
199
  1997 Sonoma
160
  1996 Sonoma
190

  Common problems of GMC Sonoma

The following chart shows the 23 most common problems for GMC Sonoma cars. The number one most common problem is related to the vehicle's service brakes, hydraulic (198 problems). The second most common problem is related to the vehicle's visibility (128 problems).

Table 2. Common problems of GMC Sonoma

Problem Category Number of Problems
  Service Brakes
198
  Visibility
128
  Structure
121
  Power Train
75
  Engine And Engine Cooling
71
  Seats
68
  Air Bag
53
  Electrical System
45
  Gasoline Fuel System
33
  Latches/locks/linkage
33
              Show morefewer problems...
  Vehicle Speed Control
32
  Suspension
32
  Exterior Lighting
27
  Unknown Or Other
22
  Equipment
18
  Steering
18
  Tire
17
  Seat Belt
13
  Other Fuel System
9
  Parking Brake
8
  Wheel
7
  Air Brake
6
  Interior Lighting
1

  Compare Reliability Across Model Years Using PPMY Index

It would not be fair to compare the older model year GMC Sonoma to a new one in terms of the problems reported since older vehicles have been in service longer and more problems should be reported. In order to compare the reliability across Sonoma model years, we use the PPMY index which is defined as the problems reported per thousand vehicles per Year. A smaller PPMY index implies a better reliability for the model year under study.

    PPMY = P / S / Y * 1000

Where P = total problems reported during the life of a GMC Sonoma model year; S = total units sold of the model year; Y = years since the debut of the model year (the age of the vehicle).

The result is shown in Table 3.

Table 3. Use PPMY Index to Compare Reliability Across Sonoma Model Years

Sonoma
Model Year
Problems Sales [1] Vehicle
Age
PPMY Index
  2004 13,19012    
0.03
  2003 5541,16513    
0.10
  2002 7339,29314    
0.13
  2001 10342,54015    
0.16
  2000 17660,14516    
0.18

  Number of Problems Reported During the First Year

Another way to measure the reliability across the model years of GMC Sonoma is to use the number of problems reported during the vehicles' first year in service, as shown in the Table 4.

Table 4. Number of problems in vehicles' first service year

Model YearProblems Reported
  2003 Sonoma
9
  2002 Sonoma
4
  2001 Sonoma
13
  2000 Sonoma
40
  1999 Sonoma
12
  1998 Sonoma
20
  1997 Sonoma
20
  1996 Sonoma
33



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