2015 Honda Pilot Serpentine Belt Routing & Replacement Guide

As an ASE-certified master technician, one of the most common maintenance items I see on the 3.5L V6 Honda engines is the drive belt system. For the 2015 Honda Pilot (equipped with the 3.5L J35Z4 V6), maintaining the serpentine belt and its associated tensioner is critical to ensuring your alternator, air conditioning, and power steering function properly.

Below is your comprehensive reference guide for the 2015 Honda Pilot serpentine belt, including part numbers, routing instructions, and replacement intervals.

Quick Answer

• Engine: 3.5L V6 (Standard on all 2015 Honda Pilot trims)
• Belt Length: Approximately 84.1 inches
• Rib Count: 6-rib
• OEM Belt Part Number: Honda 31110-RV0-A01
• Aftermarket Belt Cross-References: Gates K060841, Dayco 5060840, Continental Elite 4060840
• Auto-Tensioner Assembly OEM Part Number: 31170-RV0-A01 (Aftermarket: Gates 39077)
• Idler Pulley OEM Part Number: 31190-RV0-A01

Note: On the 3.5L V6, the water pump is driven by the timing belt, not the serpentine drive belt.

Belt Routing

Before you pick up a single tool, always take a clear photograph of your existing belt routing with your smartphone. Even with a routing diagram, having a real-life reference of your specific engine bay is invaluable if you get stuck.

For the 2015 Honda Pilot 3.5L V6, the serpentine belt routing path is as follows:

1. Start by looping the belt down around the bottom of the Crankshaft Pulley (the largest pulley at the very bottom of the engine).
2. Route the belt forward (towards the radiator) and under the A/C Compressor Pulley.
3. Bring the belt straight up from the A/C compressor and over the top of the grooved Idler Pulley.
4. Route the belt across and around the Alternator Pulley (located at the top front of the engine block).
5. Pull the belt back across the top of the engine and over the Power Steering Pump Pulley (top rear).
6. Finally, route the belt down from the power steering pump, under the smooth Auto-Tensioner Pulley, and back to the crankshaft.

Remember: The ribbed side of the belt must ride on the ribbed pulleys (Crank, A/C, Alternator, Power Steering), while the smooth back side of the belt rides against the smooth pulleys (Tensioner, Idler).

How to Replace the Serpentine Belt

Replacing the drive belt on a 2015 Pilot is a relatively straightforward job for a DIYer or technician.

Tools required:

• A dedicated serpentine belt tool or a long-handled 14mm / 19mm wrench (or a 3/8" drive breaker bar depending on your specific tensioner fitting).
• Safety glasses and gloves.

Step-by-Step:

1. Locate the Auto-Tensioner: The tensioner is located on the passenger side of the engine, right below the power steering pump.
2. Relieve Tension: Place your wrench or serpentine belt tool onto the tensioner pulley bolt. Slowly push the wrench toward the firewall (clockwise) to pivot the tensioner arm and relieve the tension on the belt.
3. Remove the Belt: While holding the tensioner back, slide the old belt off the easiest accessible pulley (usually the power steering pump or alternator). Carefully release the tensioner back to its resting position.
4. Route the New Belt: Snake the new belt through the engine bay following the routing path described above. Leave the loop for the power steering pump or alternator for last.
5. Install: Compress the tensioner again, slip the final loop of the belt over the remaining pulley, and slowly release the tensioner.
6. Verify: Double-check that all belt ribs are seated perfectly squarely in the grooves of every pulley.

Replacement Interval

Honda does not have a strict mileage interval for the serpentine belt, instead relying on the Maintenance Minder system (Code 2). However, as a best practice, you should inspect the belt every 30,000 miles and expect to replace it every 60,000 to 90,000 miles, or about every 5 to 7 years. The auto-tensioner should ideally be replaced every time you replace the belt, or at least every other belt change (roughly 100,000 miles).

Signs of a Failing Belt or Tensioner

Don't wait for the belt to snap and leave you stranded without power steering or an alternator. Look out for these symptoms:

• Squealing or Chirping: High-pitched noises, especially on startup or when the A/C kicks on, indicate a loose or glazed belt, or a weak tensioner spring.
• Visible Wear: Look for cracks, missing chunks of ribs, or fraying edges on the belt. Modern EPDM belts don't crack as often as older neoprene belts, so you should also check for groove depth wear.
• Tensioner Bounce: With the engine running, observe the tensioner. If the arm is bouncing excessively or rattling, the internal dampener has failed and the unit must be replaced.
• Heavy Steering or Battery Light: If the belt is slipping badly or snaps, you will immediately lose power steering assist and the alternator will stop charging the battery.

If you aren't comfortable performing this repair yourself, don't risk it. Find a trusted shop on Repairius.