Cadillac CT6 Technical Service Bulletin Issued for Dangerous Parking Problem

There’s a high bar for the luxury sedan and all that it should offer. The Cadillac CT6 has only been around for a few years, but it seems it hasn’t quite hit the mark. In addition to not being a favorite, it now also has a technical service bulletin that’s been issued for a potentially dangerous problem. Here’s a look at what’s going on. 

What is a technical service bulletin?

A technical service bulletin (TSB) is issued by the vehicle manufacturer to dealerships. According to Edmunds, TSBs often appear early in a vehicle’s life and help address issues that were missed when the vehicle was designed. The technical service bulletins don’t deal with safety or emissions problems, so they don’t rise to the level of being recalls. Also, they generally only apply during a vehicle’s warranty.

Problems that affect a lot of owners may convince the manufacturer to send out owner notification letters letting owners know about the technical service bulletin. If the dealership can confirm that the issue affects the owner’s vehicle, which is also under warranty, then the repair will be free.

The Cadillac CT6’s loss of park engagement

GM Authority recently mentioned that General Motors issued a technical service bulletin for the Cadillac CT6 affecting some vehicles from model years 2019 and 2020. A problem with the 10-speed automatic transmission in these cars could cause a temporary loss of park engagement when the car is shifted into park.

If this did happen, then the check engine light may come on along with one of several Diagnostic Trouble Codes (P0606, P06AF, P07E4). The repairs under this technical service bulletin will be available throughout a vehicle’s New Limited Vehicle Warranty.

What drivers can do

To take care of the problem, owners of a 2019 or 2020 Cadillac CT6 should visit the dealership. The mechanics at the dealership can reprogram the Engine Control Module and fix the issue. The dealership will perform this repair work on any vehicles that come in plus ones that are waiting to be sold.

The Cadillac CT6


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The Cadillac CT6 first appeared as a full-size sport-luxury sedan for model year 2016. The 2019 model year CT6 had four engine options: a turbocharged 2.0-liter four-cylinder, a 3.6-liter V6, a turbocharged 3.0-liter V6, and a turbocharged 4.2-liter V8.

The 2020 CT6 offered just two of the four engines, keeping the 3.6-liter V6 and the 4.2-liter V8 engines. The car was built on GM’s Omega platform, which has rear-wheel drive. However, production of the Cadillac CT6 ended in February 2020, and it has been discontinued in North America.

The 2020 Cadillac CT6 offered a relatively affordable luxury sedan with a great exterior look, according to Car and Driver. It doesn’t offer true luxury though, and the interior was a bit small and without top finishes. There are many different materials in the interior, but Car and Driver calls the overall effect “unimaginatively styled.”

Despite that, the base trim still provides heated front seats, several driver-assist safety features, navigation, plus a sunroof. Higher trims offer more features, including a head-up display, a heated steering wheel, heated rear seats, an entertainment system for the rear seats, night vision, and the Super Cruise semi-autonomous drive mode.

The car features an 8-inch touchscreen that can also be operated with a rotary controller. It includes Apple CarPlay and Android Auto compatibility along with wireless phone charging. Its main safety features are forward-collision warning and automated emergency braking, blind-spot monitoring with rear cross-traffic alert, lane-departure warning, and lane-keeping assist.

The 2019 and 2020 Cadillac CT6 has a potentially dangerous problem, so a technical service bulletin has been issued to alert dealerships and owners. Repairs can easily be made though, and these two model years will be the last for this luxury sedan, which has been discontinued in North America.