Service engine soon light on 1996 Cadillac DeVille

The service engine soon light is on, and i don't know how to get it off there.
The engine runs fine, i don't know why this light is on.
Any help will be appreciated!!!
Thanks.

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2 answers 1 comment
Hi could you reask your question with the code listed in the header (1996 Cad P1660 code autotechpat) and maybe tonight pat will see this and help you solve this
Need to have the codes read by a repair shop or if Autozone is still performing this, then tell us what code came up
Autozone did test it and the code came up as p1660 which is the cooling fan control circuit fault.....it says the ECM has detected an improper voltage level on the output driver module for the cooling fan driver circuit.