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When you get some engine trouble codes the truck's computer will disable the cruise control. Most likely your problem if the cruise control stop working at the same time. For sure the cruise won't work if the truck goes into "Limp Home Mode or reduce power mode.
 

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My check engine light came on a week or so ago and the code said it was the exhaust temperature sensor bank 1 sensor 3. Soon after the check engine light came on my cruise stoppped working. Could the exhaust temperature sensor problem have any affect on my cruise?
Read my thread "P2033 code" for solution. Easy 15 min fix for EGT sensor.

No, they are not related. The cruise control is a very well known problem and easy fix. Just search this forum. Took me maybe 10 mins.

-FB
 

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part #

Anyone have the part # I asked the dealer here wheni was in there getting new washer nozzles and he said I had to buy the whole master cylinder!!!
 

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Pm tousely ford, one of the site sponsor about what you need. They give good prices and won't try to sell the whole item when all you need is a piece.
 

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I had this happen on my job 1 08 as well. Replaced brake pressure switch and still had problems. I traced my issue to the harness under the steering wheel. There is a connector that is under the plastic cover directly under the wheel on the column, that takes all the signals from the wheel controls. One of the connections was loose, i.e. i could jiggle it while driving and get it to turn on and off. I just played around with it until is was consistently working, and then secured it the best i could. This worked for me and was a fairly easy fix. Hope this helps.
 

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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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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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