Unable To Learn TPM Sensors With Rubber Valve Stem Pressure Release Method - keywords check chirp horn low monitor program relearn tire

This PI was superseded to update Recommendation/Instructions. Please discard PIT4220A.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Some customers may comment that they are unable to perform the TPM learn procedure with the new style rubber valve stems when performing the pressure release method. This may be inconsistent from one tire sensor to the next and one vehicle to the next. Utilizing the J-46079 tool should correct this concern.

The release of air through the valve stem sets up a resonant vibration frequency that can trick the TPM Sensor into thinking it is in motion. This causes the sensor to transmit multiple pressure update messages rather than the Sensor ID learn messages. Since the Remote Control Door Lock Receiver (RCDLR) does not recognize the pressure update messages when it is in a Learn Mode, the vehicle will not complete the learn procedure, and the horn will not chirp.

For rubber valve stem sensors only, if you have any problems performing a learn procedure using the pressure release method, use the J-46079 tool to perform TPM Learn procedures.

For customers who are unable to perform the learn procedure at home, advise them of the following information:

While performing the pressure release learn method, some successful TPM relearns have been accomplished by adding or releasing air for 5-8 seconds and then waiting for the horn to chirp. You may have to wait up to 30 seconds for the horn to sound. By only adding or releasing air for 5-8 seconds reduces the resonant vibration frequency in the valve stem and increases the possibility of the sensor sending the correct ID learn message. If this does not work then replace all the TPM sensors with current SPO stock (same part number). A software fix within the TPM sensor was implemented to correct this concern.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.