2018 Cadillac ATSRecalls, problems, MPG & safety

“The vehicle has suffered a severe mechanical failure of the rear differential assembly, rendering it completely undrivable. This mechanical failure is a direct result of a known manufacturer defect documented in General Motors Technical Service Bulletin PIP5898/PIP5898B, regarding misoriented factory side bearing retaining snap rings that block internal oil ports, leading to fluid leaks, severe fluid starvation, and eventual component seizure. The component failure poses an extreme safety hazard to myself and other motorist. When a rear differential suffers catastrophic failure, this is known to cause the rear wheels and tires to lock up completely while driving leading to immediate loss of vehicle control, skidding, and high risk of high speed rear-end or rollover crash. General Motors has acknowledged this defect internally via technical bulletins but has failed to issue a safety recall to protect consumers from the catastrophic locking risk. I am filing this complaint to request that NHTSA open a formal defect investigation into the 2018 Cadillac ATS rear axle assembly.”

“The contact owns a 2018 Cadillac ATS. The contact stated that the check engine warning light was illuminated. The vehicle was taken to an independent mechanic, where it was diagnosed, and the mechanic determined that the F-module, Part Number: 86815664, used to control the engine Auto START/STOP, needed to be replaced. The dealer was contacted for the part and informed the contact that the part was not available. The contact had contacted approximately 6 dealers, who confirmed that the part was not available. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 33,527.”

“My vehicle recently started experiencing an issue where the power steering would randomly cut out while I was driving. If I pulled over and shut the car off and then turned it back on the power steering would come back. But sometimes I would have to do this multiple times in a single drive just to keep the power steering on. I know that there is already a recall for this for some 2018 Cadillac ATS and CTS vehicles, but mine was not included in the recall, despite having the same issue. Took it to the dealer for diagnostic and they ended up having to replace the control module for the power steering which cost me around $2000.”