The short answer: the TPMS sensors are mounted in each wheel, and a reset/relearn switch is typically located under the driver's left dash near the hood release.
The 2018 Honda Accord uses a direct Tire Pressure Monitoring System that continuously monitors each tire’s air pressure with sensors in the wheels and reports to the vehicle’s computer. If a tire is underinflated, the TPMS warning light will illuminate on the instrument cluster. This article explains where to find the system components and how to reset or relearn the TPMS when you change tires or adjust pressures.
Understanding the TPMS in the 2018 Accord
The TPMS in the 2018 Honda Accord relies on wheel-mounted sensors that transmit tire pressure data to the vehicle’s control module. A hidden reset/relearn control allows the system to recalibrate after inflating tires or changing tires. Knowing where these components sit helps you maintain proper tire pressure and address warnings promptly.
Where to find the TPMS components
Before you check or adjust anything, note the locations of the main TPMS elements described below.
- The tire pressure sensors are located inside each tire, attached to the valve stems in the wheel rims. These direct TPMS sensors send pressure readings to the car’s computer.
- The TPMS reset/relearn button is typically located under the lower left side of the dashboard, near the hood release lever. This hidden switch is used to trigger a system relearn after tire changes or inflation adjustments.
- The instrument cluster (and some trims’ Driver Information Interface) can display actual tire pressures and will show the TPMS warning light if any tire is underinflated or if there is a sensor fault.
Having the reset button and sensor locations in mind helps you perform quick checks and recover the system after maintenance. The exact appearance and location can vary by trim, so if you can’t find the button, consult the owner’s manual for your specific model or contact a Honda service center.
How to reset or relearn the TPMS
If you’ve inflated tires or installed new ones, you may need to relearn the TPMS so the system recognizes the correct pressures.
- Inflate all tires to the recommended cold pressures listed on the door placard or in the owner's manual.
- Turn the ignition to ON with the engine OFF. Locate and press and hold the TPMS reset button until the TPMS indicator light in the instrument cluster blinks or a confirmation appears on the display.
- Drive at a steady speed (typically around 30–50 mph) for 10–20 minutes to allow the system to relearn the new pressures. The warning light should turn off once the relearn is complete.
- If the light remains on after the relearn drive, recheck tire pressures and inspect for punctures or sensor faults, or have the system diagnosed at a Honda service facility.
Note: Some models may rely on automatic relearn simply by driving with properly inflated tires for a period of time. If you’re unsure about your trim’s exact procedure, refer to the owner’s manual or contact a dealer for guidance.
What to do if the TPMS warning light is on
When the TPMS warning light comes on, follow these steps to diagnose common causes and avoid driving on underinflated tires.
- Check all tires for proper cold inflation and adjust to the recommended pressures. Even one underinflated tire can trigger the warning.
- Look for obvious causes of pressure loss, such as a puncture or slow leak, and inspect the valve stems for damage or leaks.
- If pressures are correct and the light persists, the sensor or TPMS control module could be faulty, or a sensor battery may be depleted. A dealership or qualified tire shop can diagnose and service TPMS components.
Keeping tires inflated to the recommended specification and ensuring the sensors are intact helps prevent false warnings and extends tire life. If in doubt, seek professional service to confirm sensor health and complete a proper relearn.
Summary
On a 2018 Honda Accord, the TPMS relies on direct sensors in each wheel and a reset switch located under the driver’s left dash near the hood release. Regularly check tire pressures against the door placard, perform a relearn when changing tires or inflating significantly, and consult a dealer if the warning light remains on after following these steps. Proper maintenance minimizes false alerts and keeps your tires performing as designed.