2020 GMC Sierra 1500 Serpentine Belt: Routing, Replacement, & Part Numbers
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick Answer
- Belt Length: Approximately 2280mm (89.8 inches)
- Rib Count: 6-rib
- OEM Belt PN: AC-Delco 12678688
- Aftermarket Cross-references:
- Gates K060898
- Dayco 5060898
- Continental Elite 4060898
- Auto-Tensioner PN: AC-Delco 12678000 (Confirm for your specific engine)
- Idler Pulley PN: AC-Delco 12630000 (Confirm for your specific engine)
(Note: Part numbers provided are general and can vary based on specific engine options, such as the 5.3L V8 L84 or 6.2L V8 L87. Always verify part numbers with your VIN for precise fitment.)
Belt Routing
The serpentine belt on your 2020 GMC Sierra 1500 is crucial for powering essential accessories. Before attempting to remove the old belt, it is highly recommended to take a clear photograph of the current belt routing. This will serve as an invaluable guide during reinstallation.
For the common 5.3L V8 engine, the belt typically routes as follows:
- Begin at the Crankshaft Pulley (the lowest, largest pulley).
- From the crankshaft, the belt usually travels up to the A/C Compressor pulley.
- After the A/C compressor, the belt routes over an Idler Pulley (often a smooth pulley that helps guide the belt).
- From the idler, it continues up to the Alternator Pulley.
- Next, the belt typically goes down to the Power Steering Pump Pulley.
- From the power steering pump, it wraps around the Water Pump Pulley (usually positioned in the center-top area of the accessory drive).
- Finally, the belt routes to the Serpentine Belt Tensioner (the spring-loaded pulley that maintains belt tension) before returning to the crankshaft pulley.
Remember to consult your taken photograph or a detailed diagram specific to your engine
More specs for the 2020 GMC Sierra 1500
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2020 GMC Sierra 1500 Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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