2019 Toyota Tacoma Serpentine Belt: Routing, Replacement, and Part Numbers

Quick Answer

For the 3.5L V6 (2GR-FKS) engine:

• Belt Length: Approximately 88.5 inches (2248 mm)
• Rib Count: 6-rib
• OEM Belt PN: Toyota 90916-A2022
• Aftermarket Cross-references:
  • Gates K060885
  • Dayco 5060885
  • Continental Elite 4060885
• Auto-tensioner PN: Toyota 16620-0P030 (often sold as an assembly with the pulley)
• Idler Pulley PN: Toyota 16603-0P030 (Upper Idler) / 16604-0P011 (Lower Idler, if applicable to your specific configuration – always verify)

For the 2.7L I4 (2TR-FE) engine:

• Belt Length: Approximately 63.5 inches (1613 mm)
• Rib Count: 6-rib
• OEM Belt PN: Toyota 90916-02685
• Aftermarket Cross-references:
  • Gates K060635
  • Dayco 5060635
  • Continental Elite 4060635
• Auto-tensioner PN: Toyota 16620-0C020
• Idler Pulley PN: Toyota 16603-0C010 (Upper Idler) / 16604-0C010 (Lower Idler, if applicable)

(Note: Always verify part numbers with your VIN and a trusted parts supplier, as variations can occur.)

Belt Routing (3.5L V6 Engine - 2GR-FKS)

Before you begin any work, STOP and take a clear photograph of your existing serpentine belt routing. This is the single most important step to ensure correct reinstallation. The 2019 Toyota Tacoma 3.5L V6 engine utilizes a single serpentine belt to drive multiple accessories. The routing typically follows this path:

1. Start at the Crankshaft Pulley (the large pulley at the bottom, driving the belt).
2. From the crankshaft, the belt often routes up and to the right to the A/C Compressor Pulley.
3. After the A/C compressor, it will typically go up and over an upper idler pulley.
4. From the idler, it then wraps down and around the Alternator Pulley.
5. Leaving the alternator, the belt generally travels across to the left to the Power Steering Pump Pulley.
6. From the power steering pump, it then goes down to the Water Pump Pulley.
7. Finally, the belt will wrap under the Automatic Belt Tensioner Pulley before returning to the crankshaft pulley, completing the loop. The tensioner will have a square drive hole for a serpentine belt tool or a 3/8" drive breaker bar.

(For the 2.7L I4 engine, the routing will be similar in principle but the exact path between components may differ. Always refer to your photographic evidence or a factory service diagram for your specific engine.)

How to Replace the Serpentine Belt

Replacing the serpentine belt on your 2019 Toyota Tacoma is a manageable DIY task for those with some mechanical experience. Here’s a general overview:

1. Safety First: Ensure the engine is off and cool. Disconnect the negative battery terminal to prevent accidental starting.
2. Document Routing: As mentioned, take a clear photo of the existing belt's path.
3. Locate Tensioner: Identify the automatic belt tensioner. It will have a pulley and often a square hole or a hex nut for leverage.
4. Relieve Tension: Insert a serpentine belt tool or a 3/8-inch drive breaker bar into the square hole on the tensioner. Apply steady, downward (or sometimes upward, depending on the tensioner) pressure to rotate the tensioner arm and relieve tension on the belt. Hold it in this position.
5. Remove Old Belt: While holding the tensioner, carefully slip the belt off one of the pulleys (often the idler or the alternator pulley is easiest) and then pull it free from all other pulleys. Release the tensioner slowly.
6. Inspect Pulleys: Before installing the new belt, visually inspect all pulleys for any signs of wear, damage, or excessive play. Worn pulleys can quickly damage a new belt.
7. Install New Belt: Route the new belt exactly as depicted in your reference photo, making sure it sits correctly in all pulley grooves. Leave the final pulley (often the tensioner or an idler) for last.
8. Re-tension and Finish: Apply pressure to the tensioner with your tool again, slip the belt over the final pulley, and slowly release the tensioner. Double-check that the belt is seated correctly on all grooves of all pulleys.
9. Reconnect Battery: Reconnect the negative battery terminal.
10. Test Drive: Start the engine and let it run for a few minutes, listening for any squealing or unusual noises. Turn the steering wheel from lock to lock a few times. Take a short test drive.

Replacement Interval

Toyota generally recommends inspecting the serpentine belt during routine maintenance. While there isn