Cadillac CTS misfire problems

Filed May 28, 2025 · Engine · 181,475 miles · FL

The contact owns a 2006 Cadillac CTS. The contact stated that while driving with the cruise control set to 75 MPH, the vehicle was shuddering, and the engine was misfiring. The vehicle was taken to an independent mechanic who determined that the computer was not communicating with the vehicle. The vehicle was taken to the local dealer where it was diagnosed and determined that the computer had malfunctioned. The vehicle was not repaired. The manufacturer was called but the phone disconnected. The failure mileage was approximately 181,475.

Filed Apr 8, 2022 · Driver assistance, Engine · CO

Burning smell, traction control, rear axle service along with suspension lights all came on the odometer. Shakes at low idle and wont stay running. Happened this weekend after pulling into the driveway after driving. We scanned code for cylinder 4 misfire. On scanner we had multiple other cylinder misfires but cylinder 4 is a dead misfire. We removed spark plug and found wore. We initially thought to start with replacing spark plugs and cylinder 4 coil. We consulted with customer and agreed to replace all spark plugs and cylinder 4 coil. After replacing we found no change in cylinder 4 misfire. We removed and re installed original coil and re tested. We performed a compression test on cylinder 4 and have 0 PSI. We thought possible carboned valve stuck open due to direct injection system. We performed a GDI carbon clean but still no change. We installed a borescope into cylinder to inspect and found what looks like a broken piston or part of a valv We scanned code for cylinder 4 misfire. On scanner we had multiple other cylinder misfires but cylinder 4 is a dead misfire. Weremoved spark plug and found worn. We initially thought to start with replacing spark plugs and cylinder 4 coil. We replace all spark plugs and cylinder 4 coil. After replacing we found no change in cylinder 4 misfire. We removed and re installed original coil and re tested. We performed a compression test on cylinder 4 and have 0 PSI. We thought possible carboned valve stuck open due to direct injection system. We performed a GDI carbon clean but still no change. We installed a borescope into cylinder to inspect and found what looks like a broken piston or part of a valve broken and smashed into the piston. Fault is internal engine, would need to tear down and re build or replace engine assembly. My safety was at risk driving 80mph on the highway perhaps engine could have seized or caused problems I’m not able to deal with along with having my infant and toddler in the car.

Filed Mar 24, 2021 · Engine, Transmission · 12,300 miles · NY

I was driving my 2018 cadillac cts between 50-60mph and I lightly tapped on the gas and the car started shaking and vibrating. Felt like it could be a transmission or a engine misfire. My cars transmission also shifts very very rough kindly jerky which creates a unsafe environment while in motion. This is a consistent issue and with my car and only having 12,000 miles on it I find really concerning. This vibration only happens between 50-60mph and the rough transmission shifting happens as I drive it along with vibrations are coming from the engine which shake my entire car. All services are up to date. Cadillac and gm are both not sure of what the issue can be even though there is a pending class action lawsuit for the same issue

Filed Feb 29, 2020 · Engine, Fuel system · 35,000 miles · NC

The car only has 35000 miles on it. The engine misfires constantly when giving gas especially if your going up hill and there is more load on the vehicle. After I had $5000 worth of work to fix the problem at a cadillac dealership. They couldn't fix the issue so they came back and said that we needed a new engine. We told them over and over again that we don't think it's the engine but they guaranteed us the new engine would fix the problem. So another $5000 later and still not fixed. The vehicle idles fine, it only happens while driving. The check engine light eventually comes on indicating misfires in 2 cylinders

Filed Jan 13, 2020 · Engine · VA

I have a cts and I've gotten it service thinking it was a tune up do to it was misfiring. Come to find out that it was my cylinders gotten then fixed and it has done the same. Did research on cts and come to find out that is a major issue for these cars. What kind of solution can be made to stop these issues

Filed Jul 28, 2018 · Fuel system · 85,000 miles · NY

Driving at highway speeds, engine started to hesitate and run roughly and got increasingly worse. When pulled over, noticed that gas gauge was going down. Immediately shut off vehicle and stepped out. A massive puddle of gasoline had formed around vehicle, and gas was dripping from the entire bottom of the car, and had even gotten into the door jams and was running onto the ground.

Filed Jan 10, 2017 · Engine · 77,000 miles · PA

Tl* the contact owns a 2007 cadillac cts. While driving various speeds, the service engine warning indicator remained illuminated. The vehicle was taken to an independent mechanic where it was diagnosed that cylinder two misfired. The technician cleared the code, but the vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 77,000.

Filed Nov 13, 2015 · 8,000 miles · NY

Engine light turns on and misfire.

Filed Sep 30, 2015 · Engine, Transmission · 150,000 miles · CA

For the last year my car has ran badly. Very rough idle, engine light throwing multiple codes, bad gas mileage, heavy oil consumption, and pulsating throttle while parked and driving. I've taken it to the dealership and for an entire year they've given me the runaround. On monday I took it back in to rancho motor company in victorville, california and they finally say it's the timing chain. The recall warranty voided at 120000 miles. Now they refuse to honor the recall. My car is dangerous to drive.

Filed Oct 29, 2014 · Electrical, Engine · 92,000 miles · IN

Tl* the contact owns a 2007 cadillac cts. The contact stated that the ABS, the traction and the check engine warning lights illuminated. The vehicle was taken to a dealer, who diagnosed that the cylinder misfired and the ignition coil was shortened which needed to be replaced. The vehicle was repaired on numerous occasions however, the failure persisted. The manufacturer was notified of the failure. The approximate failure mileage was 92,000.