bic237

I have an 03 Endeavor with an ISC8.3, Had mine changed a year or two ago same symptoms.  Changed dryer and gov.. All parts were purchased at 

OReileys.  Will search for part numbers but don't think they were anything special.

I have had the same light problem for years. Spent bunch of money, they did nothing, still have problem.  Also did extra scanner thing too, no results.  On Jake brake problem, mine did same thing and after driving and watching brake function (sure is hard to run back and forth!) we discovered the shaft on brake was not retracting completely which caused the low speed and boost troubles. I ordered some lube from the brake company and applied to the points shown on bottle and forced shaft out as far as I could, inch or two, lubed shaft heavily.  Drove it, worked like new, boost back also!

  Occasionally my light would go out for a short time, after doing lube the light did not come on. I'm not saying it fixed the light but it did fix jake brake and related no turbo boost.