12/7/2023 0 Comments Valve stem core replacement![]() ![]() If the TPMS light turns on and remains solid, it simply means that one or more of the tires are low on air. Either a sensor needs to be relearned to the vehicle, one or more sensors has a dead battery, or an incorrect sensor is installed or improperly programmed to the vehicle’s make, model and year. If it blinks before remaining solid, it signals that something is wrong with the TPMS system (the sensor body). When servicing TPMS, always first check the telltale light on the dashboard. It’s also exposed to various weather conditions. The valve stem is most vulnerable to damage because it lives outside of the rim and comes in contact with all of the salt and dirt from the roads. Neglecting to replace a service kit during TPMS service can often lead to slow air leaks and, ultimately, costly comebacks. Some clamp-in sensors come with a valve stem permanently attached to the sensor body in this case, if the stem is damaged it will require a new sensor replacement. On most rubber snap-in and clamp-in valves, this will also include the stem. The “service kit” refers to all of the serviceable components of a TPMS sensor. For this reason, anytime you remove a tire from the wheel, you should replace the valve’s “service kit.” A plastic sealing valve cap should be securely tightened to prevent valve damage and galvanic corrosion. On clamp-in valve stems, a rubber grommet, aluminum nut and sometimes a seat will also be present to properly seal the sensor to the rim. Within the valve stem, a brass or aluminum valve core will be installed to control the airflow. Regardless, they serve the same purpose - to keep the air in the tire. The valve may come in a rubber snap-in or an aluminum clamp-in package. The valve stem is what ultimately connects the sensor to the rim. This is why, in the case of a low battery or technical malfunction, the entire sensor body could require replacement. Because of the nature of these enclosures, the battery and other electronics cannot be accessed and, therefore, cannot be replaced. Either way, these two types of sensor enclosures house the electronic components, including the battery, inside of the sensor to keep them free from moisture, debris and damage. It will either be laser welded with a cap or it might also have an epoxy-potted backing. The sensor body is the plastic enclosed object mounted inside of the tire that is attached to the valve stem.
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