2019 GMC Sierra 1500 — Serpentine Belt Routing & Length

Quick Answer

• Belt Length: 93.3 inches (2370mm)
• Rib Count: 6-rib
• OEM Belt Part Number: 12690558
• Aftermarket Cross-References:
  • Gates K060933
  • Dayco 5060933
  • Continental Elite 4060933
• Auto-Tensioner Part Number: 12690561
• Idler Pulley Part Number: 12690559

Belt Routing

Before you remove the old belt, we strongly recommend taking a clear photograph of the belt's path for reference. A simple picture on your phone can save a lot of guesswork during reinstallation.

The serpentine belt on the 2019 GMC Sierra 1500 with the 5.3L V8 engine follows a specific path around various engine accessories. Starting from the crankshaft pulley at the bottom of the engine, the belt routing is as follows:

1. From the crankshaft pulley, the belt travels up to the A/C compressor.
2. From the A/C compressor, it goes to the idler pulley.
3. Next, it routes to the alternator.
4. From the alternator, it moves to the power steering pump.
5. Then, it goes around the water pump.
6. Finally, the belt wraps around the tensioner pulley before returning to the crankshaft pulley.

How to Replace the Serpentine Belt

To replace the serpentine belt, you'll need a serpentine belt tool or a long-handled 3/8" breaker bar. Locate the automatic tensioner pulley—it has a 3/8" square hole where you'll insert the tool. Apply leverage to the tool to release the tension on the belt, allowing you to slip it off the pulleys. When installing the new belt, carefully follow the routing path you photographed earlier. Once the belt is routed correctly on all pulleys, slowly release the tensioner to apply pressure to the new belt.

Replacement Interval

For the 2019 GMC Sierra 1500, it's recommended to inspect the serpentine belt at regular service intervals and replace it every 45,000 to 75,000 miles, or as needed based on its condition. Environmental factors and driving habits can affect the belt's lifespan.

Signs of a Failing Belt or Tensioner

Be aware of these warning signs that indicate your serpentine belt or tensioner may need replacement:

• Squealing or Chirping Noises: This is often the first sign of a worn or loose belt.
• Visible Wear: Look for cracks, fraying, or glazing on the belt's surface.
• Accessory Malfunctions: If your power steering, A/C, or charging system are acting up, a slipping belt could be the culprit.
• Tensioner Pulley Noise: A grinding or whining noise from the tensioner area can indicate a failing bearing in the pulley.

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