Diagnostic Aids

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

If all 4 sensors fault DTC are set then look at DTC U0214 Lost Communication with Remote Function Actuator Module first prior to diagnosing TPM sensor DTCs.
Some aftermarket wheel valve stem holes are located further away from the wheel rim than on original equipment wheels. When using the tire pressure monitor tool to activate a sensor, ensure the tool is placed along the tire sidewall close to the sensor and not on the rim.
If a sensor is not recognized, it may help to rotate the wheel so that the sensor is in a different position relative to the vehicle.
A sensor may have been damaged by a previous wheel/tire service or flat tire event
Occasionally sensor transmissions are not received by the control module due to radio interference from internal (aftermarket ignition systems, DVD players, CB radios, traffic video cameras, or metallic type window tinting) or external RF sources.
Before a defective sensor is replaced, execute the learn procedure for all sensors to make sure the DTC was set for the correct position on the vehicle. The wheels may have been exchanged before without learning the new positions.
Aftermarket wheel valve stem locations can cause a sensor to not function correctly.
The use of tire sealants can obstruct the sensor pressure sensing port and cause inaccurate tire pressure readings. If this condition is verified, remove the sealer from the tire and replace the sensor. Refer to: Tire Pressure Indicator Sensor Replacement (Snap In Style) , or Tire Pressure Indicator Sensor Replacement (Clamp In Style)
The sensor activation procedure may have to be repeated up to 3 times before determining a sensor is malfunctioning. In the event a particular sensor is not learned and the horn does not chirp, it may be necessary to rotate the wheel to a different position due to the RF signal being blocked by another component.
Occasionally, sensors can become mislocated due to previous tire rotations where the sensor learn procedure was not performed. Always learn the sensors to ensure the DTC set is for that actual physical corner of the vehicle. Perform the following learn procedure: Tire Pressure Indicator Sensor Learn .