You just upgraded your trailer wheels — or maybe you're swapping between summer and winter setups. Either way, you've got TPMS sensors on the old wheels and need them on the new ones. Is it a five-minute job or a trip to the shop?
The answer depends entirely on what type of TPMS sensors you have. Some are a simple twist-off, twist-on swap. Others require dismounting the tire. And some situations mean it's smarter to just buy new sensors.
Once the sensors are moved over, a trailer tire pressure monitoring system with axle temperature monitoring keeps the whole wheel-end honest.
Here's how to handle each type, step by step, without breaking anything or losing your sensor pairing.
Before you touch anything, identify what type of sensors you're working with. The transfer process is completely different for each.
These screw onto the valve stem from the outside — they look like oversized valve caps. Most aftermarket trailer TPMS systems use this type, including many popular brands.
Pros: Easy to install and move. No tire dismounting required. You can swap them yourself in minutes.
Cons: Exposed to road debris and theft. Can vibrate loose. Slightly less accurate than internal sensors because they measure air temperature at the valve stem, not deep inside the tire.
Similar to external cap sensors, but with an important difference — they allow you to check or adjust tire pressure without removing the sensor. Air flows through the sensor body. They thread onto the valve stem externally.
Pros: Same easy installation as cap sensors, plus you can air up without removing them.
Cons: Slightly bulkier. Same exposure risks as standard cap sensors.
These mount inside the tire, attached to the valve stem assembly from the inside. Factory TPMS on trucks and cars almost always uses internal sensors. Some premium aftermarket systems offer them for trailers too.
Pros: More accurate readings. Protected from road debris and theft. Cleaner look.
Cons: Require tire dismounting to install, move, or replace. You'll need a tire shop unless you have your own mounting equipment.
If you have cap-style sensors — the most common type for aftermarket trailer TPMS — this is straightforward.
Repeat for each wheel. Total time: 5-10 minutes for a full trailer swap.
The process is identical to cap sensors above. The only difference is that flow-through sensors are slightly larger, so make sure there's clearance between the sensor body and any wheel cover, hub cap, or brake caliper.
One advantage: when moving flow-through sensors to new wheels, you can inflate the new tires to the correct pressure without removing the sensor. With standard cap sensors, you'd need to remove the sensor, inflate, then reattach.
If your TPMS sensors are inside the tire — mounted to the valve stem assembly from the inside — you cannot transfer them without dismounting the tire.
Cost at a tire shop: typically $15-30 per tire for dismount, sensor transfer, remount, and balance.
Sometimes transferring old sensors doesn't make sense:
One of the practical advantages of the TrailerWatchdog system is that it uses external cap-style TPMS sensors — so moving them to new wheels is a 5-minute, no-tools job. Unscrew from the old wheel, screw onto the new one, done.
But here's what makes TWD different from a basic TPMS: it doesn't just monitor tire pressure and temperature. It also monitors axle temperature — and the axle sensors stay on the axle regardless of what wheels or tires you're running. So when you swap wheels for the season or upgrade your tires, your axle monitoring doesn't skip a beat.
No relearn procedure. No tire shop visit. No wondering if your sensors re-paired correctly. Swap wheels, transfer the cap sensors, and you're towing with full monitoring — tires and axles — within minutes.
For more on how tire pressure affects your trailer, check out our complete trailer tire PSI guide.
If you have external cap sensors or flow-through sensors, yes — it's a simple unscrew/screw-on job. If you have internal sensors, you'll need a tire shop to dismount and remount the tires.
For most aftermarket trailer TPMS systems with external sensors, no. The sensor ID stays the same and the monitor recognizes it automatically. For factory truck TPMS with internal sensors, you may need to run a relearn procedure so the system knows the new wheel position for each sensor.
External cap sensors work on any standard Schrader valve stem. Brass or metal stems are recommended over rubber stems because the sensor's weight can stress a rubber stem at highway speed. Internal sensors are valve-stem specific — they come with their own stem assembly.
Most TPMS sensor batteries last 5-7 years. The batteries are sealed and cannot be replaced — when they die, you replace the sensor. If your sensors are approaching that age, consider buying new ones rather than transferring old ones to new wheels.
No. Factory truck TPMS only monitors the truck's own wheels. It has no way to communicate with trailer tire sensors. You need a separate aftermarket system for trailer TPMS. Learn more in our guide to RAM trailer TPMS.
