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Hello! I have a 1990 Cadillac Deville, 4.5L V8 PFI, 75,068 Miles. Today I was driving and all of a sudden the SERVICE ENGINE SOON light came on and both the Fuel In Tank and Electronic Climate Control read outs started showing a “d”. (See pictures in links below). https://i.imgur.com/urkMrQF.jpg https://i.imgur.com/jnIw9xU.jpg https://i.imgur.com/VXwOqxk.jpg Gallery On top of this the Air conditioning fan started blowing air from the dash, not hot or cold, just ambient temperature air and I can’t change the Climate Control or see the fuel level anymore.
I hope this problem could help somebody else who may have the same problem. So all these lights have come on and also it is limited to 90MPH. I have researched and have written down the error codes below. Please could someone indicate where the fault may be on the car, how to diagnose and possibly fix each code (clean sensor, maybe connector or check make sure good connection - maybe check crimping). Whether it be a sensor or connector. Hopefully the following codes will provide a check list of what to check and where it is on the car so me and anyone else with the same problem can just wo