Quick answer: Serpentine Belt Replacement DIY on a 2009–2015 Honda Pilot is rated Easy and takes about 1 hour. You'll need 5 tools for this job, and parts cost about $94. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name |
Part Number |
Price |
Buy |
| Serpentine Belt |
TRQ BPA03704 |
$28.95 |
|
| Serpentine Belt Tensioner |
TRQ BPA03790 |
$64.95 |
|
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Step-by-Step Instructions
Follow these steps carefully
1
Document belt routing and cool the engine
Park on level ground, set the parking brake, and ensure the 2009-2015 Honda Pilot engine is off and cool. Photograph or sketch the serpentine belt routing from the under-hood diagram. Wear eye protection — a spring-loaded tensioner can snap back.
🔧 Mechanic's note — Ray Delgado
I document the Pilot belt routing with a photo before I touch anything — I have routed a 3.5L belt from memory and gotten it wrong. I take the photo even when I am sure, because I have learned I am not.
2
Relieve tensioner and remove the old belt
Use a serpentine-belt tool, long breaker bar, or the specified socket on the tensioner. Rotate the tensioner to slack the belt, slip it off one pulley, then slowly release the tensioner. Remove the belt from all pulleys.
3
Inspect pulleys and tensioner
Spin each idler and the tensioner pulley by hand — roughness, play, or noise means replace that pulley/tensioner with the belt. Check for oil or coolant contamination. Compare the new belt’s length and rib count to the old one.
🔧 Mechanic's note — Ray Delgado
I inspect the Pilot pulleys and hold the new belt against the old one — length and rib count have to match exactly. I have seen a belt one inch short in the correct sleeve, and it would never have tensioned right.
4
Route the new belt
Route the new belt exactly per the diagram, leaving the easiest pulley (often the alternator or tensioner) for last. Confirm every rib sits fully in each pulley groove — a half-rib misroute will shred the belt quickly.
5
Tension and double-check alignment
Rotate the tensioner again, slip the belt onto the last pulley, and slowly release so the tensioner takes up slack. Verify the belt is centered on every pulley and the tensioner indicator is in range if marked.
6
Start the engine and verify quiet operation
Start the engine and watch the belt for several seconds — it should run true without chirps or wobble. If it squeals, shut down and recheck routing and contamination. Reinstall any shields or undercovers removed for access.
🔧 Mechanic's note — Ray Delgado
I start the Pilot and verify the belt is quiet, drive it, and check the tensioner again — a new belt stretches slightly in the first heat cycle, and I have seen the tensioner sitting at a different mark after.
All Done!
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
- • Not properly routing the new belt according to the belt diagram
- • Forgetting to check the condition of the tensioner pulley
- • Neglecting to verify the belt's tension after installation
