Cadillac P1663: Change Oil Lamp Control Circuit Malfunction

What Does The Cadillac P1663 Code Mean?

Engine speed over 600 rpm, and the PCM detected the Actual and Commanded state of the Change Oil Lamp driver control circuit did not match for over 5 seconds during the CCM test.

What Are The Potential Causes Of The Cadillac P1663 Code?

Below are some potential causes of this DTC:

• Change oil lamp control circuit is open or shorted to ground
• Change oil lamp control circuit is shorted to system power (B+)
• Change oil lamp power circuit is open (test the IP INDC fuse)
• Change oil lamp (bulb) is open or missing (check the IPC)
• PCM has failed

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> GM Genuine Parts 12633238 Engine Control Module

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

GM, 2013, Service Bullettin – Prior To Any Circuit Testing.