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

This PI was superseded to update Recommendation/Instructions. Please discard PIT4420A.

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 get the TPM system to learn the new style rubber valve stems using the pressure release method. This may be inconsistent from one tire sensor to the next and one vehicle to the next. If the J-46079 tool is used the learn procedure can be done.

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, not Sensor ID learn messages. The Remote Control Door Lock Receiver (RCDLR) does not recognize the pressure update messages when it is in a Learn Mode. This will not allow the vehicle to acknowledge the sensor with a horn chirp, and the learn procedure cannot be completed.

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, advised them of the following information:

While performing the pressure release method, some successful TPM relearns have been accomplished by adding or releasing air for 5-8 seconds then waiting for the horn. You may have to wait up to 30 second 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 an ID learn message. If this does not work then replace all the TPM sensors with current SPO stock, part number(s) did not change. 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.