General Motors has issued a Technical Service Bulletin (TSB) for the Cadillac CT6 sedan. The TSB addresses an issue affecting the 10-speed automatic transmission (MHS or MHW) in certain 2019 and 2020 model year vehicles wherein a momentary loss of park engagement could occur when shifting into park.
If a momentary loss of park engagement were to occur, one or more of the following Diagnostic Trouble Codes (DTC codes) may set and illuminate the Cadillac CT6 check engine light:
- P0606
- P06AF
- P07E4
To correct this issue, a dealer will need to reprogram the Cadillac CT6 Engine Control Module (ECM).
This service update includes customer vehicles that return to the dealership for any reason, as well as vehicles still in vehicle inventory. This particular TSB will expire at the end of the involved vehicle’s New Limited Vehicle Warranty.
The Cadillac CT6 was initially introduced for the 2016 model year as the luxury brand’s all-new full-size sport-luxury four-door. Engine options for the 2019 model year included the turbocharged 2.0L I4 LSY, the naturally aspirated 3.6L V6 LGX, the turbocharged 3.0L V6 LGW, and the turbocharged 4.2L V8 LTA. The following 2020 model year deleted the Turbo 2.0L I4 LSY and turbo 3.0L V6 LGW engine options, with the naturally aspirated 3.6L V6 LGX and turbocharged 4.2L V8 LTA offered as the only two remaining engine options.
The Cadillac CT6 rides on the RWD-based GM Omega platform, and was the first model to adopt Cadillac’s alpha-numeric naming convention, which designates crossovers with XT#, and cars with CT#.
Production for the North American markets originally took place at the GM Detroit-Hamtramck facility in Michigan. North American production of the Cadillac CT6 was slated to end in January of 2020, but as GM Authority reported previously, production was extended to mid-February. The nameplate was officially discontinued in the North American markets earlier this year.
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Comments
Select the gears with a mechanical cable.
So the detent mechanism can fail and the exact same problem occurs. Look up the Ford park-to-reverse defect. At least the electronics can sense a problem and throw a code here.
I had a 2017 CT6 and now a 2020 CT6 Premium. It is sad that Mary and GM decided to cancel a full-sized luxury sedan and try to force everybody into a mid-size/compact car. Oh, wait…they want everybody in a CUV/SUV/pickup where the profit margin is huge. Then bring on the EV’s and hope everybody only wants to travel 300 miles before they have to put in a charge, Hopefully they can find a charging station.
Maybe a $200K handmade sedan…no thanks. This is my 5th Caddy in 8 years having a DHS, SRX, XTS and the 2-CT6’s. Too bad that GM is going to loose another customer. I had intentions of buying another Corvette in a couple of years, but who know what will happen to America’s Sports Car as they are looking at making it an EV Hybrid. They only have 3 sedans left in the whole vehicle line-up, No I won’t buy a Malibu or a CT4 or a CT5 since we need to get more than 2 people in the car. Next is maybe a Mercedes.
I agree, I was sold a 2020 Ct 6 that I was told is exactly like my 2017, Not true. They stripped out so many standard features that I expected to be in the CT 6 I had. Tiers are the low profile affecting the Cady ride I am used to, no automatic trunk foot-operated, no, rear sunshade, no side window shades, no cooling steering wheel. No cooling driver’s seat, So my Ct 6 is more like a CT 5 Shame on Cady for taking a fantastic auto and turning it into a stripped-down mid rang car.