"How reliable is the 2003 Gmc Gmc Truck?"

"Based on 23 NHTSA complaints, the 2003 Gmc Gmc Truck has a median complaint mileage of 33000 miles. The most common issue is Automatic Transmission."

"What are common problems with the 2003 Gmc Gmc Truck?"

"The most frequently reported component in NHTSA complaints for the 2003 Gmc Gmc Truck is Automatic Transmission, accounting for a significant portion of the 23 total complaints filed."

2003 Gmc Gmc Truck: Reliability Data

Source: NHTSA — 23 complaints

Total Complaints

33,000mi

Median Mileage

Automatic Transmission

Top Issue

Crash Reports

When Do Complaints Happen?

Distribution of NHTSA complaints by vehicle mileage at time of report.

4,638 25th Percentile

33,000 Median Mileage

76,000 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

Automatic Transmission

Tread/Belt

Engine

Instrument Cluster/Panel

Vehicle Speed Control

Headlights

Parking Brake

Disc

Bumpers

Equipment

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"PURCHASED 2003 GMC SIERRA DENALI WITH THE 6.0L ENGINE. THE ACCELERATOR PEDAL CAN BE DEPRESSED PART WAY WITHOUT ANY CHANGE TO THE ENGINE RPMS, CAUSING THE DRIVER TO PRESS THE PEDAL EVEN FURTHER. THIS COULD BE DANGEROUS: A) DELAYED VEHICLE RESPONSE WHEN DEPRESSING GAS PEDAL, B) DRIVER DEPRESSING TH..."

"RUST DEVELOPING ON REAR SECTION OF FRONT BUMPER, 2003 GMC SIERRA 1500 PICKUP. *AK"

"MISSING AND THEY SEEM NOT ABLE TO FIX IT SOME TIMES IT SHIFTS HARD OTHER TIMES IT BACKFIRES IT HAS BEEN IN THE SHOP TWICE ALL THEY CAN SAY IS THE COMPUTER SHOWS NOTHING AND THAT HOW THE ENGINE RUNS AND THAT IS UNACPECTABLE TO ME FOR A NEW TRUCK. *LA"

Source: NHTSA ODI Complaints Database. Names and identifying details omitted.

When Were Complaints Filed?

Number of complaints by the year the issue occurred.

When Does Each Component Fail?

Median mileage at complaint for top components.

Automatic Transmission 4 complaints

25th: 6,807 mi Median: 20,988 mi 75th: 46,000 mi

Where Are Complaints Coming From?

Top states by complaint count.

CA: 4 IL: 3 WA: 2 PA: 2 RI: 2 OK: 2 NJ: 1 WI: 1 MO: 1 NY: 1

Who Files Complaints?

47.8%

Original Owners

52.2%

Second+ Owners

Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.

Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.

Data through: 2026-03-28