Usually the TPMS light means one or more tires are underinflated, or there is a sensor or system fault that requires attention.
Beyond that, the TPMS monitors tire pressure and can illuminate due to temperature changes, a slow leak, a failed sensor, or a need to relearn the system after tire work. This article explains the likely causes and what to do.
What the TPMS light means
The Tire Pressure Monitoring System (TPMS) uses sensors to monitor air pressure in each tire. If the system detects pressure below the recommended range, or if it suspects a sensor fault or data discrepancy, the warning light on your dash will come on. In some cases the light may flash briefly and then stay on. A steady light typically means low pressure; a flashing light can indicate a system fault or need for immediate attention.
Common causes in a 2008 Honda Accord
Here are the most frequent reasons drivers see the TPMS warning on this model year.
- Tire pressures are low or there’s a slow leak in one tire. Check all four tires with a reliable gauge and inflate to the recommended cold pressure listed on the driver’s door jamb or in the owner’s manual.
- A TPMS sensor battery is weak or a sensor has failed. Direct TPMS sensors have batteries that can wear out after many years; a 2008 model is at an age where sensor failure is plausible.
- A tire was recently replaced or rotated and the system hasn’t relearned the new sensor positions. The ECU may require a relearn procedure or driving at highway speeds to recalibrate.
- Extreme temperature changes can cause tire pressures to drop temporarily, triggering the light.
- A puncture, nail, or leak has developed since the last check.
- Electrical or sensor wiring fault or TPMS control module fault in rare cases.
If inflating to the recommended pressures doesn’t clear the light or you notice ongoing issues, have the system checked by a tire shop or mechanic who can read TPMS fault codes and inspect sensors, wiring, and the control module.
Steps you can take now
Follow these practical steps to diagnose and, in many cases, resolve the issue without specialized equipment.
- Check all tires when they've cooled overnight or for a few hours. Measure pressures with a reliable gauge and inflate each tire to the recommended cold pressure.
- Inspect tires for signs of slow leaks, punctures, or damage in sidewalls or beads. Look for nails or screws and check valve stems for leaks.
- Recheck after inflation. If the light stays on despite correct pressures, you may have a sensor issue or a need for relearn.
- Drive at highway speeds (roughly 40-60 mph or more) for 10-15 minutes to allow the system to relearn in many cases, especially after rotating or replacing tires.
- If the light persists, plan a service appointment. A technician can use a TPMS diagnostic tool to identify fault codes and confirm sensor health or perform a proper relearn.
Professional service can confirm whether a sensor needs replacement and ensure the TPMS is calibrated properly for safe driving.
Professional diagnosis and maintenance
In some cases, only a technician with specialized TPMS tools can pinpoint the issue. The steps below are commonly performed by tire shops or dealerships.
- Scan for TPMS fault codes and verify sensor IDs and battery status.
- Inspect each wheel sensor, wiring, and the receiver module for damage or corrosion.
- Perform a formal relearn or calibration procedure as required by the Honda system.
- Replace faulty sensors or the TPMS control module if necessary.
After professional service, ensure tires are inflated to spec and monitor the TPMS light to confirm proper operation.
Summary
The TPMS warning on a 2008 Honda Accord is most often caused by underinflated tires, but can also result from aging or faulty sensors, a recent tire change, or temperature-related pressure shifts. Start by checking and inflating all tires to the recommended cold pressure, then consider sensor health and relearning if needed. If the light remains, seek assistance from a qualified tire or automotive technician to diagnose and correct any sensor or system faults.
What does the TPMS light mean on my 2008 Honda Accord?
One in each tire (including your spare in some models) makes for a total of five sensors. If air pressure has fallen out of a specified range, the sensor sends a signal to the vehicle's diagnostic computer. Then, the diagnostic computer sends the notification to you via the TPMS light.
Why is my TPMS light on but tires are fine on my Honda?
One of the most common reasons for a TPMS light staying on despite the tires being properly inflated is a sensor malfunction. TPMS sensors are typically located inside the tire and can wear out or become damaged over time, particularly if you've hit a curb, driven through a pothole, or been off-road.
Can I still drive if my TPMS sensor is bad?
In conclusion, driving a car with a bad TPMS sensor is not advisable due to the associated safety risks, reduced fuel efficiency, accelerated tyre wear and potential legal consequences.
How much does Honda charge to reset TPMS?
The average cost for a Honda Accord Tire Pressure Monitoring System Relearn is between $49 and $72. Labor costs are estimated between $49 and $72. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.