You replace the serpentine belt by relieving tension with the belt tensioner, slipping the old belt off, and installing a new belt following the correct routing, then re-tensioning and testing. The exact path depends on whether you have the 2.4L four-cylinder or the 3.5L V6 engine, but the basic steps are the same.
This guide walks you through identifying your engine variant, gathering the right belt and tools, safely removing the old belt, correctly routing and installing the new belt, and performing post-install checks. It covers both common engine configurations for the 2012 Accord and emphasizes safety and proper belt seating and tension.
Know your engine and belt routing
Before you begin, confirm which engine your car has and obtain the correct routing diagram. The belt path differs between the 2.4L I-4 and the 3.5L V6, so using the right diagram helps prevent misrouting and premature wear.
Identify your engine and locate the routing diagram
On most 2012 Accords, the routing diagram is found on the underside of the hood or in the radiator support area. If you have access to a service manual or VIN-specific online resources, you can verify the exact belt path for your engine variant to avoid routing mistakes.
Tools and materials
Having the right belt and tools on hand minimizes time under the hood and reduces the risk of misrouting or damaging components.
- New serpentine belt sized for your engine (2.4L I-4 or 3.5L V6)
- Socket set and ratchet or a belt tensioner tool (commonly 3/8" drive) to release the tension
- Wrench suitable for turning the tensioner
- Safety gear: gloves and eye protection
- Routing diagram or owner’s/service manual (for the correct belt path)
Having the correct belt and a reliable routing diagram helps ensure a proper fit and proper tracking once the belt is installed.
Step-by-step replacement procedure
Follow these steps in order to remove the old belt and install the new one. If you’re not comfortable performing automotive repairs, consider professional service. Always work on a cool engine and on a flat surface.
- Park on a level surface, set the parking brake, and disconnect the negative battery terminal to prevent accidental starting.
- Locate the belt routing diagram and identify the tensioner pulley. If the diagram isn’t visible, trace the current belt path around all pulleys before removing it.
- Relieve tension on the belt by rotating the tensioner with a wrench or ratchet. Keep a firm hold to avoid the belt snapping back. Slide the belt off a pulley, typically starting with the pulley closest to you and then freeing the belt from the remaining pulleys.
- Remove the old belt completely and inspect the belt and pulleys for wear, cracks, glazing, or oil contamination. Replace any worn pulleys or a faulty tensioner if needed.
- Install the new belt along the routing diagram. Ensure the belt sits properly in the grooves on all pulleys and that it is not twisted. Start by seating the belt on the non-tensioned pulleys and then route it toward the tensioner.
- Re-apply tension by slowly releasing the tensioner. Verify the belt is fully seated on every pulley and that there are no twists or misalignments.
- Reconnect the negative battery terminal, start the engine, and listen for squeaks or unusual noises. Visually inspect the belt after a short idle and again after a short test drive to confirm proper operation.
After it is installed and running, a quick test confirms the belt is tracking correctly and there are no abnormal noises indicating misalignment or looseness.
Post-install checks and maintenance
Once the belt is in place, perform these checks to help ensure longevity and reliable operation.
- Check belt tension and alignment after the first short drive; look for glazing, cracks, or wear.
- Inspect the tensioner and idler pulleys for noise, wobble, or looseness.
- Replace the belt at the intervals recommended by Honda, typically around 60,000–100,000 miles depending on driving conditions—check your owner's manual for specifics.
Regular inspections of the belt and pulleys help prevent unexpected failure and help keep your Accord running smoothly.
Summary
Replacing the serpentine belt on a 2012 Honda Accord is a straightforward maintenance task when you know your engine variant, have the correct belt and routing diagram, and safely relieve tension on the tensioner to remove and install the belt. Verify proper seating and tension, test run the engine, and inspect pulleys and the belt afterward. When in doubt, seek professional assistance to avoid damage or injury.
Can I replace my serpentine belt by myself?
Most DIYers will be able to replace a bad serpentine belt on their own with a few common tools. Before you get started, collect these items so you're prepared: ½” breaker bar or belt tensioner tool. Ratchet and socket set.
Can I drive if my serpentine belt is bad?
It's not a good idea to drive with a broken serpentine belt. It is dangerous, especially if it breaks while you are driving. It could cause an accident, or cost you time and money replacing parts that get damaged as a result.
How much does it cost to replace a serpentine belt on a Honda Accord?
between $127 and $167
The average cost for a Honda Accord Serpentine Belt Replacement is between $127 and $167 but can vary from car to car.
What is the weakness of the Honda Accord?
This powertrain shines in sport and touring trims providing a balance of power and smoothness that rivals European sedans hybrids with their 2.0 L Atkinson cycle engine and ECVT excel in fuel economy.