TPMS Sensor Batteries: Life Expectancy and Replacement

The direct tire pressure monitoring system uses radio frequency (RF) technology to transmit measured tire pressure and sometimes temperature readings to a vehicle's on-board electronic control unit (ECU). If the tire pressure in one or more tires is 25% or more below the manufacturers recommended level, then a low tire pressure warning light is turned on, warning the driver of underinflation.

Tire pressure monitoring sensors are usually powered by a 3-volt lithium ion battery. Some TPMS sensors use a 1.250-volt nickel metal hydride battery. The battery is encased in the sensor's molded plastic housing. A battery that is running low on or is depleted requires the replacement of the ENTIRE TPMS sensor assembly.

How Long Do TPMS Batteries Last?

Life Expectancy of TPMS Batteries

On average, TPMS sensor batteries have a lifespan of 5 to 10 years, depending on factors such as:

- Battery Quality: High-quality batteries tend to last longer.

- Usage Frequency: More frequent use, including long drives, can shorten battery life.

- Environmental Conditions: Extreme temperatures and exposure to moisture can accelerate battery degradation.

The longevity of the TPMS battery is typically aligned with the lifespan of the TPMS sensor itself. Manufacturers often design these batteries to last the same duration as the sensor, making them a vital consideration for maintenance.

Signs of a Failing TPMS Battery

A failing TPMS battery can result in inaccurate readings or a complete lack of data transmission. Key signs to watch for include:

1. Dashboard Warning Light: If the TPMS warning light remains illuminated or flashes intermittently, it could indicate a low or dead battery.

2. Inconsistent Tire Pressure Readings: Erratic or inaccurate tire pressure readings may result from a failing battery.

3. Loss of Signal: In some cases, the sensor may fail to transmit any data to the vehicle's monitoring system.

If you notice any of these symptoms, it’s essential to address the issue promptly to ensure optimal tire performance and safety.

When to Replace TPMS Batteries

Scheduled Maintenance

Most vehicle manufacturers recommend replacing TPMS sensors, including the batteries, every 5 to 7 years. Scheduling battery replacement during regular tire servicing or replacements can help minimize additional labor costs.

Battery-Only Replacement

While some TPMS units allow for individual battery replacement, many sensors are sealed units. For these, the entire sensor must be replaced once the battery dies. Consult your vehicle’s user manual or a trusted technician to determine whether your TPMS supports battery-only replacement.

Steps to Replace a TPMS Battery

Replacing a TPMS battery requires specialized tools and expertise. Below is a step-by-step guide for battery replacement:

1. Access the TPMS Sensor:

   - Remove the tire and locate the sensor inside the wheel.

2. Inspect the Sensor:

   - Check for physical damage or wear that may warrant replacing the entire sensor.

3. Open the Sensor Housing:

   - Carefully open the sealed sensor casing to access the battery.

4. Replace the Battery:

   - Remove the old battery and insert a new one of the same type and specification.

5. Reassemble and Test:

   - Re-seal the sensor, reinstall the tire, and ensure the TPMS is functioning correctly by performing a system calibration.

For sensors that do not support battery replacement, consult a professional to replace the entire sensor unit.

Cost of Replacing TPMS Batteries

Battery Replacement

The cost of replacing a TPMS battery varies based on factors such as:

- Labor Charges: Professional replacement may cost between $20 and $50 per sensor.

- Battery Type: High-quality batteries can range from $5 to $15 per unit.

Sensor Replacement

If the entire sensor needs to be replaced, expect to pay between $50 and $250 per sensor, depending on the make and model of your vehicle.

Maintaining Your TPMS System

To maximize the lifespan of your TPMS sensor batteries and ensure reliable performance:

- Monitor Tire Pressure: Regularly check your tire pressure manually to validate sensor accuracy.

- Service Regularly: Include TPMS inspection as part of routine vehicle maintenance.

- Avoid Extreme Conditions: Limit exposure to harsh environmental conditions whenever possible.

Why TPMS Battery Maintenance Matters

Neglecting the TPMS battery can compromise your vehicle’s safety, fuel efficiency, and overall performance. A well-maintained TPMS system provides:

- Enhanced Safety: Timely alerts about underinflated or overinflated tires reduce the risk of blowouts.

- Improved Fuel Economy: Properly inflated tires enhance fuel efficiency.

- Extended Tire Life: Maintaining correct tire pressure prevents premature wear.

By staying proactive about TPMS battery maintenance, you ensure a safer and smoother driving experience.