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Discussion Starter · #1 ·
Just did the first tire rotation on a '21 GMC Sierra 1500. The manual states that need to reset the TPMS which then requires a special relearn tool. Found relatively inexpensive tools when search Google and looked at some utube but can not figure out how to get the TPMS into the learn mode. So which buttons need to be pushed at same time or is there another way of entering this learn mode?
 

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On my 2017 it is holding the lock and unlock buttons on the key fob.
 

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2020 GMC Sierra 3500 HD Denali
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scroll to the tire pressure page on the display. hold the thumb wheel (select) down until the horn chirps. when the horn chirps, the truck is in relearn mode. start at drivers front wheel, work around clockwise
 

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There’s a really cool book that comes with that fancy truck, tells you all about it, the manufacturer tends to put it in the glove box. There’s even pages about TPMS.
 

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From PDF of 2021 1500 Sierra Owners Manual:

(instructions require a relearn tool)

TPMS Sensor Matching Process

Each TPMS sensor has a unique identification code. The identification code
needs to be matched to a new tire/wheel position after rotating the vehicle’s tires or
replacing one or more of the TPMS sensors.

Also, the TPMS sensor matching process should be performed after replacing a spare tire with a road tire containing the TPMS sensor. The malfunction light and the DIC
message should go off at the next ignition cycle.

The sensors are matched to the tire/ wheel positions, using a TPMS relearn tool, in the following order:
driver side front tire,
passenger side front tire,
passenger side rear tire, and
driver side rear.

See your dealer for service or to purchase a relearn tool.

A TPMS relearn tool can also be purchased.

See Tire Pressure Monitor Sensor Activation Tool at www.gmtoolsandequipment.com or
call 1-800-GM TOOLS (1-800-468-6657).

There are two minutes to match the first tire/wheel position, and five minutes overall to match all four tire/wheel positions.
If it takes longer, the matching process stops and must be restarted.

The TPMS sensor matching process is:

1. Set the parking brake.

2. Turn the ignition on without starting the vehicle.

3. Uplevel DIC Only: Make sure the Tire
Pressure info page option is turned on.
The info pages on the DIC can be turned on and off through the Options menu.
See Driver Information Center (DIC) (Base Level) 0 122 or
Driver Information Center (DIC) (Midlevel and Uplevel) 0 124.

4. If the vehicle has an uplevel DIC, use the DIC controls on the right side of the steering wheel to scroll to the Tire
Pressure screen under the DIC info page.
If the vehicle has a base level DIC, use the trip odometer reset stem to scroll to the Tire Pressure screen.

5. If the vehicle has an uplevel DIC, press and hold the thumbwheel located in the center of the DIC controls on the right side of the steering wheel.
If the vehicle has a base level DIC, press and hold the trip odometer reset stem for about five seconds. A message asking if the process should begin should appear.
Select yes and press the trip odometer reset stem to confirm the selection.

The horn sounds twice to signal the receiver is in relearn mode and the TIRE LEARNING ACTIVE message displays on the DIC screen.

6. Start with the driver side front tire.

7. Place the relearn tool against the tire sidewall, near the valve stem.
Then press the button to activate the TPMS sensor.
A horn chirp confirms that the sensor identification code has been matched to this tire and wheel position.

8. Proceed to the passenger side front tire, and repeat the procedure in Step 7.

9. Proceed to the passenger side rear tire, and repeat the procedure in Step 7.

10. Proceed to the driver side rear tire, and repeat the procedure in Step 7.
The horn sounds two times to indicate the sensor identification code has been matched to the driver side rear tire, and the TPMS sensor matching process is no longer active.
The TIRE LEARNING ACTIVE message on the DIC display screen goes off.

11. Turn the vehicle off.

12. Set all four tires to the recommended air pressure level as indicated on the Tire and Loading Information label.


2021 Sierra also has Tire Fill Alert standard on all trims.

If wanting to use it

Tire Fill Alert

This feature provides visual and audible alerts outside the vehicle to help when inflating an underinflated tire to the recommended cold tire pressure.

When the low tire pressure warning light comes on:
1. Park the vehicle in a safe, level place.
2. Set the parking brake firmly.
3. Place the vehicle in P (Park).
4. Add air to the tire that is underinflated.
The turn signal lamp will flash.

When the recommended pressure is reached, the horn sounds once and the turn signal lamp will stop flashing and briefly turn solid.

Repeat these steps for all underinflated tires that have illuminated the low tire pressure warning light.
{Warning
Overinflating a tire could cause the tire to rupture and you or others could be injured.
Do not exceed the maximum pressure listed on the tire sidewall.
See Tire Sidewall Labeling pg 360 and
Vehicle Load Limits pg 221.

If the tire is overinflated by more than 35 kPa (5 psi), the horn will sound multiple times and the turn signal lamp will continue to flash for several seconds after filling stops.
To release and correct the pressure, while the turn signal lamp is still flashing, briefly press the center of the valve stem.

When the recommended pressure is reached, the horn sounds once.

If the turn signal lamp does not flash within 15 seconds after starting to inflate the tire, the tire fill alert has not been activated or is not working.

If the hazard warning flashers are on, the tire fill alert visual feedback will not work properly.


The TPMS will not activate the tire fill alert properly under the following conditions:

. There is interference from an external device or transmitter.

. The air pressure from the inflation device is not sufficient to inflate the tire.

. There is a malfunction in the TPMS.

. There is a malfunction in the horn or turn signal lamps.

. The identification code of the TPMS sensor is not registered to the system.

. The battery of the TPMS sensor is low.

If the tire fill alert does not operate due to TPMS interference, move the vehicle about 1 m (3 ft) back or forward and try again.
If the tire fill alert feature is not working, use a tire pressure gauge.
 
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