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Thread: 2009 MK5 Jetta 2.0TDI Cruise Control Problems

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  1. Question 2009 MK5 Jetta 2.0TDI Cruise Control Problems 
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    Hey guys, I've a little problem that I've been facing for a while in my MK5 Jetta.

    Basically cruise control only properly works in third gear. It sometimes works in fourth but usually cuts off after a few seconds. In fifth gear, it works sometimes; I mostly have to keep pressing the cruise control button many times and it'll eventually work, but otherwise it usually cuts out. It almost always doesn't work in sixth but sometimes the light will come on for a second then go off. I've had a look through other threads regarding cruise control cutting out but nothing has really helped at all.

    I've had my phone mounted on the dashboard with OBDEleven live data for the cruise control switch displayed, and it seems to detect the button presses with no problem, so I'm pretty sure it's not a problem with the switch. The car however just doesn't seem to want to actually engage cruise control.

    The car has never been remapped and comes with cruise control from stock.

    Any help would be greatly appreciated, thanks!
     
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  2. Re: 2009 MK5 Jetta 2.0TDI Cruise Control Problems 
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    It is very common for the Golf 5 type cruise control to go faulty and this does not always register as a fault code or show as button presses as the signal is too fast, also clutch master cylinder hall sender problems are common, telling the ECU the pedal has been pushed when it hasn’t and the brake pedal switch can do the same. To catch these ghost switching events it is necessary to display the relevant blocks as a graph that stays on the screen for a good 30 seconds or more as a spike but I don’t know how to do this with OBD11.
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