- PrintableYes
- Works onPC, Mac, iPhone, iPad, Android phones and tablets
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2020 GMC Sierra 2500 HD / 3500 HD repair manual
$79.99
- Do the labor yourself. On most repairs the shop’s labor costs more than the parts. With the factory procedure you can do that part yourself.
- Built for your VIN. Your engine, transmission and options, so you don’t have to guess which section applies.
- Factory steps, specs and wiring. Repair procedures with illustrations, torque values and the complete wiring diagrams.
- Find any job in seconds. Searchable PDF with a full index and bookmarks.
- In your inbox in 12–24 hours. Yours to keep, on any computer, phone or tablet.
Description
2020 GMC Sierra 2500 HD / 3500 HD OEM service and repair manual, T1XX – VIN-specific PDF
The 2020 GMC Sierra 2500 HD / 3500 HD (T1XX) factory repair manual, made for your VIN from GM's factory service data: step-by-step repair procedures, specifications and wiring diagrams for your exact Sierra 2500 HD / 3500 HD. The 2020 Sierra 2500 HD / 3500 HD was offered with two engines and two transmissions (listed below); your manual covers the combination your VIN shows.
This page is for the heavy-duty 2020 Sierra 2500 HD and 3500 HD. For the light-duty truck, see the 2020 GMC Sierra 1500 manual.
Bought from a Google Top Quality Store, owned by you. No account to renew and no access that runs out: the manual stays on your computer, phone or tablet.
Why buy the 2020 Sierra 2500 HD / 3500 HD manual here
- Factory information, not an aftermarket book: the same GM procedures and specifications dealer technicians use
- Built for your VIN: only the engine, gearbox and options your Sierra 2500 HD / 3500 HD actually has
- Yours to keep: pay once and the PDF stays with you
- A PDF with working hyperlinks: click a reference in a procedure and you land on the wiring diagram, spec or step it points to. Most PDF manuals sold online are flat scans without them
- Complete wiring diagrams and connector views, not just the mechanical sections
- Online since 2015, rated a Google Top Quality Store
What this manual has that the owner's manual does not
The owner's manual stops where the repair starts. The factory repair manual picks up from there:
- Owner's manual: controls, warning lights, maintenance schedule, fluid types
- Factory repair manual: diagnosis by trouble code, step-by-step repairs, tightening torques, wiring diagrams and connector views
The 2020 Sierra 2500 HD / 3500 HD belongs to the T1XX Sierra HD generation, model years 2020–2026. As the first year of the generation, it shares little with the older model; use procedures for this year only.
Engine options
- 6.6L V8 gasoline
- 6.6L Duramax V8 turbo diesel
Transmission options
- 6-speed automatic (gasoline)
- Allison 10-speed automatic (diesel)
Not sure which version you have? You don't need to know: the VIN tells us, and the manual is built for it.
Typical repairs for a 2020 Sierra 2500 HD / 3500 HD
- Spark plugs and ignition coils
- Coolant and transmission fluid service
- Battery, starter and charging faults
- Sensor faults: oxygen, ABS wheel speed, mass air flow
- Door lock actuators and window regulators
- Glow plugs and cold-start faults
- Diesel particulate filter regeneration
- EGR valve and cooler
What NHTSA records show for the 2020 Sierra 2500 HD / 3500 HD
The U.S. safety agency NHTSA lists 9 safety recalls and 125 owner complaints for the 2020 Sierra 2500 HD / 3500 HD. The factory manual has the procedures for the parts involved.
- Latches/Locks/Linkages: Latch (campaign 20V142000)
- Tires: Temporary/Emergency Spare Tire (campaign 21V578000)
- Seat Belts (campaign 20V792000)
- Air Bags: Inflator (campaign 20V446000)
- Seat Belts: Pretensioner (campaign 19V814000)
- Structure: Hood (campaign 20V324000)
- Latches/Locks/Linkages: Latch (campaign 24V060000)
- Power Train: Software (campaign 24V797000)
- and 1 more
Most owner complaints concern: Power Train (43), Unknown Or Other (22), Electrical System (22), Service Brakes (20), Engine (15).
Check your VIN: the 10th character is “L” on a 2020 model.
Other GMC manuals: 2020 Acadia, 2020 Canyon, 2020 Savana, 2020 Sierra, 2020 Terrain, 2020 Yukon.
How it works: you order with your VIN, we put together the GM service information for that vehicle, and the PDF reaches your inbox in 12–24 hours. It works offline and prints page by page.
Sections of the 2020 Sierra 2500 HD / 3500 HD service manual
- General information, vehicle identification and lifting points
- Maintenance schedules, fluids and capacities
- Engine mechanical: timing, cylinder head, lubrication
- Cooling system
- Fuel system and engine management
- Ignition, starting and charging
- Emission controls
- Exhaust system
- Clutch and manual transmission
- Automatic transmission / transaxle
- Driveshafts, axles and differential
- Suspension, front and rear
- Steering
- Brakes and ABS
- Heating, ventilation and air conditioning
- Restraints and airbags
- Body, doors, glass and trim
- Lighting and instruments
- Electrical components and module locations
- Wiring diagrams
- Diagnostic trouble codes
Versions offered
Engines:
- 6.6L V8 gasoline
- 6.6L Duramax V8 turbo diesel
Transmissions:
- 6-speed automatic (gasoline)
- Allison 10-speed automatic (diesel)
Your manual is built for the version in your VIN.
Video
This video is for information. Your manual looks and works the same way, but it is not identical.
Delivery
Free, by email in 12-24 hours.
