It may not be possible to learn the Trailer Tire Pressure Monitor (TPM) sensors to some 2024-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks or the TPMS pressure readings may not appear consistently in the trailering app on the infotainment screen. (Fig. 10)
Fig. 10
These conditions may be due to the animated tail lamps on the truck, which may cause radio frequency interference with the Trailer TPM system. (Fig. 11)
Fig. 11
Factors Affecting the Trailer TPM System
A number of factors may affect Trailer TPM performance, such as tire construction, wheel design and material, and the distance of the Trailer TPM sensor to the TPM module. (Fig. 12)
Fig. 12
Heavy-duty construction tires with multiple sidewall plies can act like an insulator and block the TPMS signal. Heavy-duty wheel construction, such as forged aluminum wheels, also will decrease sensor transmitting performance.
The distance of the trailer axle to the rear bumper of the truck will affect TPMS performance as well. The trailer tire pressure sensors can transmit up to 23 feet (7 meters) from the hitch receiver of the vehicle.
Before a defective sensor is replaced, complete the learn procedure for all sensors to make sure the DTC was set for the correct position on the trailer. The wheels may have been exchanged before without learning the new positions.
Review Trailer Tire Pressure Monitoring under Trailering Description and Operation in the appropriate Service Information before proceeding with any repairs.
TIP: The trailer tire pressure sensors can be learned only for the selected trailer profile. When the tire pressure sensor setup is complete, a double horn chirp will be heard and the turn signals will illuminate twice. If a double horn chirp is not heard, confirm that all of the tire pressure sensor parameters display YES.
Tail Lamps
If the cause of the Trailer TPMS malfunction is not found, confirm that the truck currently has the animated tail lamps, and then replace the tail lamps with the parts included in Bulletin #26-NA-143. The tail lamp animation of the new LED-style tail lamps will be different from the original tail lamps.
Replacing the tail lamps will require Body Control Module (BCM) and K219 Lighting Control Module (ELM) reprogramming for proper operation. Contact the Techline Customer Support Center for the BCM and ELM calibrations. Refer to the appropriate Service Information for instructions.
For more details, including parts information, refer to Bulletin #26-NA-143.
– Thanks to Kevin Minor
