JDIAG TPMS Relearn Tool U508 — Universal 315/433MHz Tyre Pressure Reset Tool, 2026 Edition

The JDIAG U508 is a handheld TPMS relearn tool that quickly resets and reactivates pre-programmed tire pressure sensors on most 315MHz and 433MHz passenger vehicles.

If you replaced a TPMS sensor, rotated tires, or cleared a pressure alarm, the U508 is built to trigger each factory sensor and complete the vehicle's relearn sequence without needing dealer equipment. This 2026 Edition expands compatibility across many American and global makes including Ford, Chevy, Jeep, Dodge, GMC, Cadillac, Nissan, Buick, Lincoln and Chrysler, provided the vehicle uses 315MHz or 433MHz sensors.

How do I use the U508 to relearn TPMS sensors?

Putting the vehicle into its TPMS learning mode and using the U508 in the correct sequence is essential. The tool transmits a signal to each sensing valve, prompting the car to register that sensor position in its control module.

• Enter the vehicle's TPMS learn mode (you'll usually hear two horn chirps).
• Begin at the left front tire and hold the U508's antenna close to the valve stem area; press and release the power button.
• When the horn chirps, move to the next wheel in this order: LF → RF → RR → LR.
• Two horn chirps at the end confirm a successful relearn sequence.

Which vehicles and sensors are compatible with this tool?

The U508 supports many passenger cars, SUVs and light pickups that operate on 315MHz or 433MHz TPMS frequencies. Compatibility depends on the vehicle’s make, model year and factory TPMS frequency; some older or less common models may not be supported.

• Designed for common brands such as Ford, Chevy, Jeep, Dodge, GMC, Cadillac, Nissan, Chrysler, Buick and Lincoln.
• Works only with pre-programmed, frequency-matched sensors (315MHz or 433MHz).
• Not compatible with blank/unprogrammed sensors or sensors on heavy-duty trucks with more than four tires.

What installation tips and limitations should I know?

Correct antenna placement, a fresh 9V battery, and the proper wheel position are critical for reliable operation. The U508 transmits a radio pulse — low battery or misalignment can prevent the vehicle from receiving the signal.

• Use a new 9V battery (not included); battery voltage affects signal strength.
• Keep front wheels pointing straight during the relearn procedure for consistent results.
• Place the tool’s antenna near the valve stem or wheel flange as instructed; improper placement may fail to detect the sensor.

Can the U508 program new sensors or replace dealer tools?

The U508 is a relearn/reset tool only — it activates already-programmed TPMS sensors so the vehicle can recognize their IDs. It does not write IDs into blank sensors and cannot serve as a programming device for unprogrammed aftermarket units.

• Use only sensors that have been pre-programmed to the correct frequency and ID format.
• If a sensor is blank or mismatched, the U508 will not make it function; a programming tool or pre-programmed replacement is needed.
• If your vehicle cannot enter relearn mode, consult the owner’s manual or a qualified technician.

Who is this for: The JDIAG U508 suits DIY vehicle owners, independent mechanics and fleet technicians who need a portable, affordable way to complete TPMS relearn procedures on passenger cars, SUVs and light pickups that use 315MHz or 433MHz sensors. It's ideal when replacing sensors, after tire rotation, or when clearing persistent TPMS warnings — provided replacement sensors are pre-programmed and the vehicle supports relearn mode.