2021 GMC Sierra AT4
1GTU9EET9MZ434006
This 2021 GMC Sierra AT4 is listed at $29,899 with 113,311 miles in Mandeville, LA.
Market Price Range
Vehicle Decode
- Body
- Pickup
- Engine
- 3.0L · V6 · Diesel
- Drive
- 4WD/4-Wheel Drive/4x4
- Doors
- 4
- Made by
- GENERAL MOTORS LLC
Safety
- ✗ Backup camera
- ✗ Blind-spot monitor
- ✗ Lane departure
- ✗ ABS
- ✗ Electronic stability
Price history for this VIN
Price dropped $131 (−0.4%) over 5 months.
Asking prices recorded across 11 listing dates for VIN 1GTU9EET9MZ434006, spanning 5 months.
Safety & ownership
EPA fuel economy (MPG)
Model-level data for the 2021 GMC Sierra from NHTSA (recalls, NCAP crash tests) and EPA fueleconomy.gov, refreshed July 28, 2026.
Active listings
Full listing history on VehiSales →| Dealer | Location | Price | Mileage | Listed |
|---|---|---|---|---|
| Varsity Auto Group | Mandeville, LA 70471 | $29,899 | 113,311 mi | 2026-02-07 |
Former listings
| Dealer | Location | Price | Mileage | Listed |
|---|---|---|---|---|
| Auto Innovation | Ridgeland, MS 39095 | $36,995 | 111,733 mi | 2026-04-04 |
| Classic Elite Buick GMC | Houston, TX 77094 | $31,816 | 111,638 mi | 2026-03-14 |
| Varsity Auto Group | Mandeville, LA 70471 | $30,335 | 113,311 mi | 2026-02-08 |
| Classic Elite Buick GMC Of Houston | Houston, TX 77413 | $31,816 | 111,638 mi | 2026-02-07 |
| Classic Buick GMC | Houston, TX 77094 | $31,816 | 111,656 mi | 2026-02-07 |
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