The service and repair manual for the 2020 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 | 2020 |
|---|---|
| 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 2020 Sierra 1500 variants | Sierra → |
| Federal record | 9 recalls · 630 complaints · 1,436 technical service bulletins (refreshed 2026-08-21) |
02 / InsideSample pages from the 2020 Sierra 1500 manual
03 / ContentsSections in the manual
- Quick Lookups 293
- General Information 2,055
- Accessories & Equipment 11,908
- Heating, Ventilation & A/C (HVAC) 685
- Body & Frame 3,909
- Maintenance 16
- Brakes 1,556
- Restraints 403
- Drivelines & Axles 799
- Steering 485
- Electrical 6,035
- Suspension 387
- Engine Mechanical 2,422
- Transmission 1,291
- Engine Performance 3,743
- Front Wheel Drive Shaft 185
04 / Known issuesRecalls on federal record for the 2020 Sierra 1500
- Air Bags — side/window › curtain › inflator · 20V446000If the diffuser separates from the inflator during deployment, rrab performance may be degraded, inc.
- Service Brakes, Hydraulic — foundation components › disc › caliper · 20V116000Broken caliper bolts can reduce brake performance or interfere with wheel rotation and increase the.
- Tires · 21V115000Over cured tires may develop a break in the sidewall resulting in sudden air loss or a belt edge sep.
- Power Train — driveline › driveshaft · 20V650000If the driveshaft separates, there may be a loss of propulsion, increasing the risk of crash.
- Fuel System, Gasoline — delivery › fuel pump · 19V837000Over-pressurization can crack the fuel pump and cause leaks, increasing the risk of a fire in the pr.
- Tires — temporary/emergency spare tire · 21V985000An abs system that does not function properly can increase the risk of a crash.
- Seat Belts — pretensioner · 19V814000A vehicle fire could result if materials ignite inside the vehicle.
- Electrical System — 12v/24v/48v battery › cables · 19V888000An intermittent electrical connection between the b+ battery cable and the alternator could cause th.
- Tires · 20V684000Overcured tires may experience a carcass break in the sidewall resulting in a sudden air loss or cou.
Owners have filed 630 complaints and GMC has issued 1,436 technical service bulletins for the 2020 Sierra 1500. The manual carries the manufacturer's diagnostic and repair procedures behind these systems.
FAQQuestions about the 2020 Sierra 1500 manual
Is this manual specific to the 2020 Sierra 1500?
Yes. It is the OEM manual matched to the 2020 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, SLE Extended Cab Pickup 4-Door, AT4 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 2020 Sierra 1500 problems does it help with?
9 recalls are on federal record for the 2020 Sierra 1500, covering air bags, service brakes, hydraulic, 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 2020 Sierra 1500 wiring diagrams?
Yes — the complete wiring diagrams for the 2020 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 2020 GMC models
2024 Sierra 1500 · 2023 Sierra 1500 · 2022 Sierra 1500 · 2021 Sierra 1500 · 2019 Sierra 1500 · 2018 Sierra 1500 · 2017 Sierra 1500 · 2016 Sierra 1500 · 2015 Sierra 1500 · 2014 Sierra 1500 · all 26 years
2020 GMC Acadia · 2020 GMC Canyon · 2020 GMC Savana 2500 · 2020 GMC Savana 3500 · 2020 GMC Savana 4500 · 2020 GMC Sierra · 2020 GMC Sierra 1500 Limited · 2020 GMC Sierra 2500 HD · 2020 GMC Sierra 3500 HD · 2020 GMC Terrain · 2020 GMC Yukon · 2020 GMC Yukon XL · every 2020 model