The service and repair manual for the 2021 GMC Sierra 1500 — 5.3L V8 and 6.2L V8 and 3.0L I6 and 4.3L V6 and 2.7L I4 engines, 12 trims. Matched to this exact model year, so the specifications and sequences are the ones GMC published for your car, not figures carried over from a neighbouring year.
01 / FitmentWhat this manual covers
| Model year | 2021 |
|---|---|
| Engines | 5.3L V8 — 325 cu in, OHV 6.2L V8 — 376 cu in, OHV 3.0L I6 — 183 cu in, DOHC, turbocharged 4.3L V6 — OHV 2.7L I4 — 166 cu in, DOHC, turbocharged |
| Trims | AT4 Crew Cab Pickup 4-Door · Base Standard Cab Pickup 2-Door · SLT Crew Cab Pickup 4-Door · Base Extended Cab Pickup 4-Door · Denali Crew Cab Pickup 4-Door · SLE Crew Cab Pickup 4-Door +6 |
| Other 2021 Sierra 1500 variants | Sierra → |
| Federal record | 3 recalls · 659 complaints · 1,429 technical service bulletins (refreshed 2026-08-21) |
02 / InsideSample pages from the 2021 Sierra 1500 manual
03 / ContentsSections in the manual
- Quick Lookups 937
- Engine Performance 6,461
- Accessories & Equipment 11,438
- General Information 2,027
- Body & Frame 4,045
- Heating, Ventilation & A/C (HVAC) 705
- Brakes 1,470
- Maintenance 16
- Restraints 395
- Drivelines & Axles 754
- Steering 482
- Electrical 5,400
- Suspension 374
- Engine Mechanical 2,287
- Transmission 1,228
- Reverse 45
04 / Known issuesRecalls on federal record for the 2021 Sierra 1500
- Seat Belts · 20V811000If a seat belt assembly is not properly attached to the vehicle, the seat belt may not properly rest.
- Tires — temporary/emergency spare tire · 21V985000An abs system that does not function properly can increase the risk of a crash.
- Tires · 20V684000Overcured tires may experience a carcass break in the sidewall resulting in a sudden air loss or cou.
Owners have filed 659 complaints and GMC has issued 1,429 technical service bulletins for the 2021 Sierra 1500. The manual carries the manufacturer's diagnostic and repair procedures behind these systems.
FAQQuestions about the 2021 Sierra 1500 manual
Is this manual specific to the 2021 Sierra 1500?
Yes. It is the OEM manual matched to the 2021 model year, covering the 5.3L V8 and 6.2L V8 and 3.0L I6 and 4.3L V6 and 2.7L I4 across the AT4 Crew Cab Pickup 4-Door, Base Standard Cab Pickup 2-Door, SLT Crew Cab Pickup 4-Door, Base Extended Cab Pickup 4-Door, Denali Crew Cab Pickup 4-Door, SLE Crew Cab Pickup 4-Door, Base Crew Cab Pickup 4-Door, SLT Extended Cab Pickup 4-Door, AT4 Extended Cab Pickup 4-Door, SLE Extended Cab Pickup 4-Door, Elevation Crew Cab Pickup 4-Door, Elevation Extended Cab Pickup 4-Door trims. Specifications and procedure sequences are the ones GMC published for this year.
What 2021 Sierra 1500 problems does it help with?
3 recalls are on federal record for the 2021 Sierra 1500, covering seat belts, tires. The manual carries the manufacturer's diagnostic and repair procedures for those systems; the recall repairs themselves are done free by GMC dealers.
Does it include 2021 Sierra 1500 wiring diagrams?
Yes — the complete wiring diagrams for the 2021 build, alongside repair procedures, specifications and diagnostics.
Is it a subscription?
No. $49.99 once and the manual is yours. It is a digital manual — nothing ships; access details arrive by email after checkout and it works on any device.
RelatedOther Sierra 1500 years and 2021 GMC models
2024 Sierra 1500 · 2023 Sierra 1500 · 2022 Sierra 1500 · 2020 Sierra 1500 · 2019 Sierra 1500 · 2018 Sierra 1500 · 2017 Sierra 1500 · 2016 Sierra 1500 · 2015 Sierra 1500 · all 26 years
2021 GMC Acadia · 2021 GMC Canyon · 2021 GMC Savana 2500 · 2021 GMC Savana 3500 · 2021 GMC Savana 4500 · 2021 GMC Sierra · 2021 GMC Sierra 1500 Limited · 2021 GMC Sierra 2500 HD · 2021 GMC Sierra 3500 HD · 2021 GMC Terrain · 2021 GMC Yukon · 2021 GMC Yukon XL · every 2021 model