2015 Chevrolet Silverado 1500 Serpentine Belt Routing & Replacement Guide

As an ASE-certified master technician, I frequently see the 2015 Chevrolet Silverado 1500 roll into the bay for routine maintenance. One of the most common and vital services for this truck is serpentine belt replacement. For the 2015 model year, the 5.3L V8 (EcoTec3 L83) is the most popular engine option. Notably, this generation of Silverado utilizes Electric Power Steering (EPS), meaning there is no power steering pump on the accessory drive. Additionally, the A/C compressor is driven by its own separate stretch-fit belt.

Below is the comprehensive guide for replacing the main accessory drive belt on the 2015 Chevrolet Silverado 1500 5.3L V8.

Quick answer

Here are the essential specifications and part numbers for the 2015 Chevy Silverado 1500 (5.3L V8) main accessory drive belt:

• Belt Length: 38.39 inches (Main drive belt)
• Rib Count: 6-rib
• OEM Belt Part Number: GM / ACDelco 12626222
• Aftermarket Cross-References: Gates K060378, Dayco 5060378, Continental Elite 4060378
• Auto-Tensioner Part Number: ACDelco 12668977 (Gates 39396)
• Idler Pulley Part Number: ACDelco 12668975

Note: The 4.3L V6 and 6.2L V8 engines may share similar routing but always verify exact part numbers with your parts supplier using your VIN. The A/C belt is a separate stretch-to-fit belt (Gates K040348 or similar) mounted behind the main belt.

Belt routing

Since we can't render an image here, it is absolutely critical that you photograph your existing belt routing before removal. The 5.3L V8 main belt routing is relatively short and straightforward compared to older generations:

1. Start by looping the ribbed side of the belt around the bottom of the Crankshaft Pulley.
2. Bring the belt up and over the ribbed Water Pump Pulley (located in the upper center of the engine block).
3. Route it down and under the smooth Idler Pulley.
4. Pull it up and around the ribbed Alternator Pulley (top driver's side).
5. Finally, pull the belt down to slide over the smooth roller of the Automatic Belt Tensioner (passenger side, just above the crank), which you will be holding open with your tool.

How to replace the serpentine belt

Replacing the main serpentine belt on the 2015 Silverado 5.3L is a straightforward job that can be completed in your driveway in about 15-30 minutes.

Tools needed:

• 3/8-inch drive breaker bar or a dedicated long-handle serpentine belt tool.
• Safety glasses and gloves.

Step-by-step process:

1. Locate the tensioner: Open the hood and locate the automatic belt tensioner on the passenger side of the water pump.
2. Release the tension: Insert the 3/8-inch square drive of your breaker bar or serpentine belt tool directly into the square slot on the tensioner body. Rotate the tensioner counterclockwise (towards the passenger side fender) to relieve tension on the belt.
3. Remove the old belt: While holding the tensioner open, slip the old belt off the closest smooth pulley (usually the tensioner itself or the idler pulley). Slowly let the tensioner return to its resting position. Remove the belt from the engine bay.
4. Inspect pulleys: Before installing the new belt, spin the idler pulley, alternator, and water pump by hand. Listen for grinding noises and check for lateral play. If the tensioner moves too easily or binds, replace it now.
5. Install the new belt: Route the new belt following the path described in the routing section above, leaving the tensioner pulley for last.
6. Apply tension: Rotate the tensioner counterclockwise again, slip the belt over the tensioner pulley, and carefully release the tensioner to apply pressure to the belt.
7. Verify seating: Visually inspect every pulley to ensure the ribs of the belt are perfectly seated in the grooves. Start the engine and let it idle for a minute to ensure smooth operation.

Replacement interval

For the 2015 Chevrolet Silverado 1500, the factory-recommended replacement interval for the serpentine belt is 97,500 miles or 10 years, whichever comes first. However, as an ASE-certified technician, I highly recommend inspecting the belt every 15,000 miles starting at the 60,000-mile mark. Modern EPDM belts do not crack like older neoprene belts; instead, the ribs wear down like tire tread.

Signs of a failing belt or tensioner

Don't wait for the belt to snap on the highway. Look out for these warning signs:

• Squealing or Chirping: A high-pitched squeal on startup or during acceleration usually indicates a stretched belt, a weak tensioner spring, or a failing pulley bearing.
• Visible Wear: Look for missing rib chunks, fraying edges, or a glazed (shiny) appearance on the belt surface. You can use a cheap belt-wear gauge tool to check groove depth.
• Accessory Issues: If your alternator isn't charging properly, your engine is running hot (water pump slipping), or the battery light comes on, the belt may be slipping.
• Tensioner Bounce: With the engine running, observe the tensioner. Minor vibration is normal, but excessive bouncing or a metallic rattling noise indicates the internal dampener has failed.

If you aren't comfortable tackling this job yourself, or if you need the specialized A/C stretch belt replaced as well, leave it to the pros. Find a trusted shop on Repairius.