Which parts fail
Components named in complaints (engine, cooling system, oil leaks, timing chain, exhaust).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 1996 Cadillac Deville owners, lightly cleaned up (personal details are redacted by NHTSA).
My 1996 Cadillac Deville concourse has developed a defect whereas it will accelerate on it's own, shutting down the A/C for more horsepower while it does it. I have seen it accelerate through 80 MPH once. The condition goes away temporaily when the engine is shut off and recranked, returning at unpredictable intervals. My local Cadillac dealer refused to repair the problem, giving me a "go away and never come back speech" advising me strongly to junk the car (it's in almost perfect condition otherwise). I think I May have a 'smoking gun' car for those people who have killed, maimed, destroyed property with cars that accelerate by themselves. The dealer had the car overnight and claimed to have made no frepairs, but it has not repeated this since I got it back today. It was a chronic conditioin three days ago near the end of a 3000 mile trip. …
Very dangerous situation occurred while driving on city roads where posted speeds are 35-45 MPH. The car just started to speed up on its own and I could not get the engine to slow down. The only way I could avoid a traffic accident was to ride the brakes continuously. By the time I got home the brakes were smoking and extremely overheated. I almost could not stop with the engine racing and the brakes worn out. I had to shut the engine down while still in drive, almost running into the wall of my house. I am 70 years old and was very scared. On edmunds .com there are three other reported instances of the same thing happening with the same make and model. My car is undriveable and I will have to get it towed from my house to the dealer for it to be checked out, please follow up on this as it is a very dangerous condition. I was very close to having an accident.
Tl* the contact owns a 1996 Cadillac Deville. The contact stated that the vehicle began to run hot as soon as the engine was started. The vehicle was taken to an independent mechanic for diagnosis where he was informed that the engine block was cracked. The manufacturer was notified and stated that they would repair the vehicle at their cost and advised the contact to take the vehicle to a local dealer. The dealer stated to the contact that the manufacturer advised them not to make any repairs to the vehicle. A letter was written to the chief executive officer who responded that they would not assist in the repair of the vehicle. The failure and current mileage was 74,000.
Loss of engine coolant on my 1996 Cadillac Deville. Took car into dealer and they diagnosed blown head gaskets. Repair called for engine removal and cost approx. $3400. I have heard of a number of other GM northstar engines having this same type of failure. My car has been dealer maintained since new and with only 85,000 miles on this car and the number of other similar failures reported, I consider this a manufacturers design fault.
My father purchased a 1996 sedan Deville brand new. He passed away in April 1998. My mother drove the car until this year. She gave me the car. The car has approx 17,000 miles. I just found out the car has a blown rear head gasket. I realize the car is 15 yrs old but I feel this should not have happened with such low mileage. The car was never abused and still smells new inside. Do I have any recourse with GM?
Front wheels passed through a puddle and water splashed into engine compartment while I attempted to make a turn. There was a complete loss of power steering and the turn could not be completed. The effect was momentary but scared me quite a bit. This has happened three times on different rainy days with the car.
While driving at any speed and with out any warning, the vehicle will stall and it will be hard for the consumer to control the vehicle. Dealer notified. Mr when the vehicle stalled, loss of all power including brakes and steering occurred.
I have a 1996 Cadillac Deville that I purchased new. At about 83K miles, I noticed that an oil leak had started from under the engine. I took it in to the dealer near where I live now (moritz Cadillac in arlington, tx), and was told that the cause of the oil leak was the wearing out of the engine seals at the bottom of the engine. I was then told it would cost $1,800 to repair as it would require the complete removal of the engine from the car to repair (about 18 hours of labor). After some research on the web I found that this is apparently a fairly common problem with Cadillac's with the northstar engine. I believe this to be a design flaw in the engine, and because the cost is so high, makes it very difficult for owners to have the repairs done, and hence are driving cars that are both environmentally unsound and potentially unsafe due to the leaking oil.
Engine stalls at 30 MPH after letting off of the gas. Losing all power assist the steering and brakes as it did this weekend on a mountain road in ar. While slowing down for a 10 MPH curve.... If my wife had been driving she cound not have made the turn and been down the mountain side !!! This problem has persisted sinc e arround sept 2000. Most of the time they cannot duplicate problem. Last time I left the car for several days. When it stalled they replaced the crank sensors, now it stalls at 30 MPH instead of at stops only !!!
Experienced problems with brakes, A/C compressor and leak in engine. The consumer was sent correspondence notifying her of a recall on the 1996 Cadillac sedan diville. The recall did not cover the problems the consumer was having with her vehicle. The consumer was told she needed struts. After having the vehicle serviced the consumer was told there was a leak in the engine. Consumer got rid of the vehicle and bought another type of vehicle.
Engine complaints in other Deville years
Frequently asked questions
How common are engine problems on the 1996 Cadillac Deville?
NHTSA has 41 complaints about the engine & cooling of the 1996 Cadillac Deville, 19% of the model year's 218 complaints. The component named most often is engine › gasoline (11 mentions).
Is there a recall for 1996 Cadillac Deville engine problems?
No. NHTSA lists no engine & cooling recall for the 1996 Cadillac Deville, though it has 2 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 1996 Cadillac Deville engine problems start?
Half of the complaints with a recorded mileage happened before about 74,000 miles, and 9% before 25,000 miles.
Is it dangerous?
Owners linked 0 crashes, 2 fires and 0 injuries to engine & cooling problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.