TPMS After Tyre Work: What Vancouver Drivers Need to Know

After a tyre change in Vancouver, there is a step many drivers skip without knowing it: TPMS recalibration. The tyre pressure monitoring system in most modern vehicles does not measure pressure directly — it infers it from the rotation speed of each wheel via sensors mounted inside the tyre. When you mount new tyres, the sensor positions change and the system needs to relearn them. Here is what TPMS actually does, what can go wrong if it is not recalibrated, and what the process involves.

How Modern TPMS Works

There are two types of TPMS. Direct systems use a sensor with a pressure transducer mounted inside each tyre, typically on the valve stem or attached to the inner wheel. The sensor transmits real-time pressure readings to the car's ECU. Indirect systems have no pressure sensors inside the tyre at all — they use the ABS wheel speed sensors to detect when one tyre is rotating at a different speed than the others, which indicates lower pressure. Most modern vehicles use direct TPMS.

Direct TPMS sensors run on batteries sealed inside the sensor housing. These batteries typically last five to seven years before the sensor needs to be replaced outright — not recharged or repaired. If you are on your second set of tyres on a car that is five-plus years old, the original sensors may be due for replacement regardless of the tyre change.

Why Tyre Changes Affect TPMS

When tyres are unmounted and remounted — even on the same rim — the sensor may be disturbed, damaged, or in the case of a valve-stem-mounted sensor, the rubber seal may be compromised during removal. The more common issue is not physical damage to the sensor but the system losing its reference point. The ECU stores the IDs of each sensor and their baseline pressures. After a tyre change, the system needs to be told which sensors are where.

On some vehicles this happens automatically via a drive cycle. On others it requires a relearn procedure — either through a menu in the dashboard or via a dedicated TPMS tool at a tyre shop. If the relearn is not done, the system may not register one or more tyres after the change, and the tyre pressure warning light stays on or cycles intermittently.

Vancouver-Specific TPMS Issues

The Lower Mainland presents a couple of specific conditions that affect TPMS performance. Cold weather causes tyre pressure to drop — for every 10°C drop in temperature, tyre pressure falls by roughly 1 PSI. In Vancouver autumn and winter, this is a significant effect. A tyre that was correctly inflated at 35 PSI in summer can read 30 PSI on a cold November morning, which is enough to trigger the TPMS warning light on many vehicles. Before assuming the sensor has failed, check the pressure with a gauge and top up as needed.

BC roads include rough surfaces and potholes that can physically dislodge a valve-stem-mounted sensor over time. If you have hit a significant pothole and subsequently get a TPMS warning, have the sensor inspected rather than dismissed. Physical impact damage to the sensor is not visible from outside.

What to Expect When You Get New Tyres

A quality tyre shop in Vancouver will test the TPMS sensors before dismounting the old tyres, record the sensor IDs and inform you of the sensor condition before any work begins. After mounting the new tyres, they should perform the relearn procedure if required for your vehicle. Some vehicles support auto-relearn through a specific drive cycle and do not require a tool. Others need a TPMS tool to register the sensor IDs to the ECU.

If the shop quotes you for new tyres without mentioning TPMS, ask specifically. Replacing a failed sensor is a separate cost from the tyre itself. On most vehicles, sensor replacement involves dismounting the tyre from the rim, installing the new sensor, and then performing the relearn. It is typically a short job but not one that can be skipped.

When to Replace Sensors vs. Just Recalibrate

If the TPMS warning light comes on after a tyre change and stays on after a relearn, the sensor itself may have failed. Common signs of sensor failure include the warning light appearing and staying on despite correct tyre pressure, or the system failing to register a specific tyre even after relearn. Sensor failure is more likely on vehicles over five years old or after multiple tyre changes where the sensor has been handled repeatedly.

Some drivers opt to replace all four sensors proactively when changing tyres on an older vehicle, to avoid a sensor failure on the road later. Others replace sensors one at a time as they fail. Either approach is valid depending on the vehicle age and your preference. JRS Auto Customs works with local tyre specialists and can advise on TPMS sensor condition and replacement options as part of any tyre-related service. Browse the tires service page or get in touch to discuss.