Google acknowledges that Android 9 on Pixel/XL 2016 does not support fast charging
Many Pixel XL 2016 users said that the fast charge function could not use after the official version of Android 9.0 Pie was installed. In response to user feedback, Google today responded that it is testing software fixes and will release them as soon as possible to resolve the problem of slow charging. If the test is all right, it is expected to release in the next few weeks.
“We’re aware of an issue where non-Power Delivery (PD) USB-C chargers no longer rapidly charge the 2016 Pixel and Pixel XL after the upgrade to Android 9 Pie. The 18W rapid charger included in-box is a PD charger and does not exhibit this behavior. We are verifying a fix for non-PD USB-C chargers and will roll it out in the coming weeks.“