Intermittent Cruise Control Function - Page 3 - Diesel Forum - TheDieselStop.com
6.4L Power Stroke Engine and Drivetrain Discussion of the 6.4L Power Stroke diesel engine and drivetrain in the 2008-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.4L Power Stroke engine.

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post #31 of 32 (permalink) Old 03-31-2014, 09:37 AM
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Had the same problem with my 2010 F250. Took it too the dealer and told them to replace the brake pressure switch and that solved my problem.
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post #32 of 32 (permalink) Old 08-07-2019, 01:12 PM
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Originally Posted by MPD56 View Post
Mark: if you left click on his name in blue writing (FordCustomerService) a window will come down and then click on “send a private message to FordCustomerService”.

As far as the brake pressure switches, there are two screwed in the bottom of the master cylinder and also a switch on the brake pedal, sorry not sure how they are tied to the cruise control. I do know that the cruise control circuits go through self tests and are monitored by the ECM and if there is an error, it will disable the cruise control and produce a diagnostic code that will be stored in the ECM, but won’t produce the MIL or Wrench light. Chances are you might have a code stored and maybe a reader other then a Dealer’s will tell you. Also there are other codes that will disable the cruise control, for example if the EGR valve sticks and the truck goes into “Limp Home Mode”.
I have a F350 and have replaced the brake pedal switch and the master cylinder switch myself, still not working properly. Had it into my auto repair shop. they dismantled the entire system, could not see a problem, diagnostics found nothing. Had it a week with no luck. Put it all back together and it worked. The cruise worked fine driving around the area. Drove it for 160 miles, shut it down 30 minutes, cruise still working. Drove about 5 miles further, shut it down for about 3 hours and cruise will not work. Craziest thing I have ever seen. Don't know what to do now except try to replace the cruise control buttons in the steering wheel. It's almost like it may be overheating during long trips. Park it overnight, crank her up the next morning and its working.
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  Diesel Forum - TheDieselStop.com > 2008-2010 Ford Super Duties > 6.4L Power Stroke Engine and Drivetrain

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