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If using the driver information center/dic, press and release info button until tire learn message is indicated.Depress and hold set/reset button until two horn chirps are sounded indicating learn mode has been activated, front left turn signal will be illuminated. Starting at the left front tire, increase/decrease the air pressure for 8 to 10 seconds and wait for the horn chirp. It may take 30 seconds for the horn to chirp. When horn chirp has sounded the sensor information is learned, then the turn signal for next location will be illuminated and so on. When all sensors have learned the horn will double chirp. Turn key to off position to exit learn mode. Adjust all tire pressures to recommended pressures. System will complete calibration process as vehicle is driven.
Knowing the model would help, the info above covers several chevy models, but, not all.
What year is it? If it is a newer truck there is a reset procedure that is required to be done. It is a fairly simple proceedure and can be found in the owners manual. You turn the key on and step on the brake pedal three times then turn the key off and step on the brake pedal three times, then turn the key on, The horn will chirp if the mode has been entered. Starting at the RF tire start letting air out, the horn will chirp indicating to move to the next tire (RF,RR,LR,LF). when all sensors have been accepted turn the key off and the horn will chirp twice. With the key off set the pressures to the factory specs (located in the door jamb or fuel filler cover) and you should be set. If when going through this procedure and it fails to indicate by a horn chirp one of the tires, that will be the one with a bad sensor.
After TPMS sensor replacement or tire rotation, reprogramming is required. 1. key on engine off, parking brake on. 2. turn park lights on and off 4 times you will hear a horn chirp twice, you are in program mode. Start at L/F tire release air for 10 seconds, wait 15 seconds until horn chirp, after chirp go to R/F tire do the same until horn chirp then R/R let air out til the chirp then L/R do the same after the L/R chirp, turn key off and you are done, note you have only 5 min. to complete. If you do not hear horn chirp at each tire, you will have to start from beginning. When complete, remember to add air to each tire, 35 psi is recommended.
is it just a dummy light on the dash or is it more specific like L.F tire low,ect?
if its a dummy light then you need to go to a garage with a tire pressure monitor service to to check to see if the batteries in the monitors are still good or if you are just dealing with a leaking tire.
If you Tahoe uses wheel speed sensors to monitor tires and pressure you may have a faulty wheel speed sensor or a heads up that your wheel bearing is wearing and the gap between the tone ring and sensor have increase or decreased
good luck
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