This is a 1994 cadillac Eldorado‘s, and I took it to auto zone and they said they don‘t put the code machine on anything younger than 1996. Thank You!
The service ride control means there is a problem with the air suspension system. There is an air pump, a height sensor and adjustable struts. The service needed soon is a maintenance reminder. Get under the vehicle and check for broken/rubbed through air lines. On a vehicle that old the air pump could also be bad.
On an Eldorado you might have the hydraulic ride system that controls all four struts. The struts are as high as $600 a piece and there's typically no aftermarket on this particular item so you have to buy from the dealership. If you just have the rear air shocks on it then there is aftermarket shocks that will fit it and less then $100 a pair with new thin plastic air line included. There's a ride sensor under the right rear side of the car that can be adjusted to make the car ride lower or higher and I imagine this sensor can be damaged or wear out. This send the signal to the small air compressor located near the master cylinder/brake booster under the hood. This little compressor can wear out. I'd look at all four struts very carefully to figure out of you have the four wheel hydraulic ride system or just the rear wheel pneumatic (air ride) shocks. If you see any kind of thin tube going into the front struts then you have the hydraulic system. Always look for leaks as this can affect both air and hydraulic ride systems and is cheaper to repair than replacing unnecessay parts. You don't have to have an automatic air ride system. I put one on a Buick years ago and had the valve stem put under the bumper or license plate area and used any air-compressor to pump it up if I had a heavy load in the trunk and let the air out if riding light. I think Gabriel makes the air shocks that fit many different cars including Cadillac. Check JC Whitney online or AutoZone or Advance Auto or O'Reilly's Auto or PepBoys. Good Luck!
