If the service engine soon light is on and there are no codes then the most likely cause of this is either a code that your reader is not picking up or a loss of communication with the ECM.
Here is a guide that will help with the most common causes of the ECM:
When you hook your scan tool up, are you able to actually communicate and view the PCM/ECM information?
If you are then I suspect the scan tool is just not cable of recognizing the type of codes that are there. Most generic scan tools will only pick up powertrain issues which are P codes. If you have communication or more electrical codes like U, C, or B codes then you scan tool may not be capable of reading them.
Here is a review of a scanner that is capable of this and not too pricy:
Please run through this info and let us know what you find and we can go from there. Thanks
Wednesday, September 1st, 2021 AT 5:07 PM