Just sharing what I found looking around. Working in IT, I am use to standards and rely on them regularly. It's odd the GM vehicles (2016-2017) state they are Qi compatible, and the iPhone 8/X states it is Qi compatible, yet they do not work together. Which one is not adhering to the standard, assuming they were both under the Qi specification 1.X.X
I know they phone is newer vs. the truck, but standards are designed to clear this stuff up. Reading the article below from the Wireless Power Consortium (the folks who created the Qi standard), it sounds like newer Qi versions should be backwards compatible, implying newer devices should work on older chargers. (if I am reading and understanding it correctly)
Pulled the text below about the Qi specifications from the following page: https://www.wirelesspowerconsortium.com/developers/specification.html
Couldn't find a older listing for GM but this may be the Qi charging unit in the 2018's? https://www.wirelesspowerconsortium.com/products/details/1801/wireless-charging-transmitter
A brief history of the Qi specification
Qi specifications are numbered with three digits: X.Y.Z. For example 1.0.3
X is called the major revision number. Specifications with the same major revision number are backward and forward compatible.
Y is called the minor revision number. A change in minor revision number implies that new requirements are introduced while maintaining backward compatibility previously certified products
Z is called the editorial revision number. Editorial revisions include clarifications, integrate new transmitter designs into one document, and may add new test to the test specifications.
CURRENT VERSION OF THE QI SPECIFICATION
The current version of the Qi specification has version number 1.2.3. The Qi specification that is available for public download has version 1.2.2. Version 1.2.3 is available only to members of the Wireless Power Consortium. It will be made available for public download later in 2017.
HISTORY OF THE QI SPECIFICATION
Version 1.0
Qi transmitter delivers 5 Watt power into a Qi phone.
Choice of transmitter designs include single coil transmitter, coil array transmitter, and moving coil transmitter.
High flexibility in design of Qi receivers
Limited flexibility in the design of Qi transmitters
Version 1.1
Increased design freedom for transmitters. You can now choose between 12 different transmitter specifications.
Increased sensitivity of "Foreign Object Detection". This prevents heating of metal objects in the neighborhood of an active transmitter.
The possibility to power a Qi transmitter with a USB charger.
Version 1.2
Fast charging. The possibility for transmitters to deliver up to 15 Watt power and the option for receivers to obtain up to 15 Watt.
An improved thermal test for transmitters
Improved timing requirements
Changed limits for Foreign Object Detection improve the sensitivity.
Optional unique identifier for power receivers (WP-ID)