Like many others on this forum, I needed to sync my TPMS sensors after rotating my tires. I found the relearn tool for ~$20 on Amazon: ref=pd_lpo_vtph_263_bs_t_1?_encoding=UTF8&psc=1&refRID=Q4WC2P625KPWWT2F9FJS.

EL50448 GM TPMS Activation Reset Trigger Tool NOTE: 9V Battery not included Compatible with Buick, Cadillac, Chevrolet, GMC, Hummer & Pontiac TPMS only! For assistance finding the correct parts for your vehicle contact us at [email protected] or call 1+(714) 692-TPMS (8767)

I bought a Kent-Moore EL-50448 reset tool for $49.99 shipped to my door that works on all GM vehicles. Seems that's the only way to do it or go to the dealership every time I rotated my tires. ec-t5.html
How to use EL-50448 TPMS Relearn Tool Tire air Pressure reset ZR2 Specific but universal for GM. John Drives Anything. 185K views 5 years ago.
1. Need 1x pcs 9v battery to work 2. Set the car in TPMS learning mode. (car horns) 3. Starting from the left front tire,the antenna of the dedicated toolfor tire pressure monitoring is facing upwards against the tire sidewal near the rim of the valve stem to start the antenna.Press and release the button and wait for the speaker to emit a chirp. VXDAS GL-50448 TPMS Relearn Reset Activation Tool for G-M series Vehicles. It can quickly reset tire sensors after you do tire rotation or change a new tire, suitable for G-M Vehicles(Chevy / Buick / G-MC / Opel /Cadillac etc) that equipped with 315/433 MHz tire pressure monitor system Sensors.
How to use the EL-50448 OEC-T5 tool to reset your TPMS sensors VXDAS 2K subscribers Subscribe Subscribed 5.9K views 4 years ago more more VXDAS 2IN1 & Ultimate TPMS Relearn Tool
That's a help - knowing the VXDAS EL-50448 OEC-T5 is the right relearning tool for the 2018 CTS. So I tried again - this time I tried the Left Rear tire first as the valve stem was at 11:00, the others were down at 18:00. I got it to recognize the Left Rear - horn beeped. I could not get it to work with any of the other tires. TPMS Activation Reset Trigger Tool - For GM Vehicles 9V BATTERY NOT INCLUDED TPMS Activation Reset Trigger Tool - For GM Vehicles will work on the following GM vehicles: Buick Buick; Allure; 2007 - 2008 Buick; Allure; 2009 - 2010 Buick; Cascada; 2015 - 2018 Buick; Enclave; 2008 - 2018 Buick; Encore; 2013 - 2018 Buick; Envision; 2016 - 2018 6RU1OA.
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