Bit of an issue happened to my car today. Can you help?

ricostuart

Registered User
Drove to work this morning, and all was well. The car was purring away nicely on cruise control. On the way home, the cruise control no longer activates at all. No warning messages, or lights on dash.

Also feel that sometimes (more often than not) today that the car feels very very sluggish. especially in 2nd gear (tiptronic). That is until you put your foot further to the floor, then suddenly its at the correct power level. Could there be an issue with the throttle position sensor? Easy to replace?

I got home, and did a VAGCOM check, and these where the messages:
Code:
Address 01: Engine        Labels: 079-910-560-BBK.lbl
   Part No SW: 8E0 910 560 L    HW: 4E0 907 560 
   Component: 4.2L V8/5V      G   0010  
   Revision: --------    Serial number:               

1 Fault Found:
16955 - Brake Switch (F) 
            P0571 - 008 - Implausible Signal
Readiness: 0000 0000


Address 02: Auto Trans        Labels: 09L-927-760.lbl
   Part No SW: 8E0 910 156 M    HW: 09L 927 156 
   Component: AG6 09L  4.2L5V RdW 0040  
   
1 Fault Found:
17087 - Brake Switch (F) 
            P0703 - 000 - Electrical Malfunction
             Freeze Frame:
                    Fault Status: 01110000
                    Fault Priority: 0
                    Fault Frequency: 24
                    Reset counter: 40
                    Mileage: 165394 km
                    Time Indication: 0


             Freeze Frame:
                    RPM: 960 /min
                    RPM: 992 /min
                    RPM: 640 /min
                    (no units): 35.0
                    (no units): 22.0
                    Temperature: 57.0°C
                    T.B. Angle: 0.0°



Cleared the codes, then only thing that was left straight away was :

Code:
Address 02: Auto Trans        Labels: 09L-927-760.lbl
   Part No SW: 8E0 910 156 M    HW: 09L 927 156 
   Component: AG6 09L  4.2L5V RdW 0040  
  
1 Fault Found:
17087 - Brake Switch (F) 
            P0703 - 000 - Electrical Malfunction
             Freeze Frame:
                    Fault Status: 01110000
                    Fault Priority: 0
                    Fault Frequency: 24
                    Reset counter: 40
                    Mileage: 165394 km
                    Time Indication: 0


             Freeze Frame:
                    RPM: 960 /min
                    RPM: 992 /min
                    RPM: 640 /min
                    (no units): 35.0
                    (no units): 22.0
                    Temperature: 57.0°C
                    T.B. Angle: 0.0°

Could this be the cuase of the cruise control not working? Is the switch just the one on the brake pedal? I happen to have a spare one lying around anyway.

Any ideas?
 

rizzini7

Well-Known Member
VCDS Map User
Yeah mate, clutch and brake switch are usual cause to killing cruise control. I'd personally give that a go first if you've got one laying around. Hope it fixes it!
 

rizzini7

Well-Known Member
VCDS Map User
Yeah that's why I said clutch and brake :). It's usually one or the other
 

hades-

Well-Known Member
VCDS Map User
well its comeing up on the scan so its 99% its the brake switch
 

ricostuart

Registered User
Changed the brake switch this afternoon. Took a few attempts till it was set right and the cruise seems to work, but will have a long drive tomorrow to see if it keeps working. Will pop out shortly to do a vagcom check. The new one thankfully was the new style without the ratchet mechanism inbuilt (unlike the one that I removed). Quite easy to install if you remember to put it in place, and allow the brake pedal to move the plunger before rotating the unit to lock it in place. That was my first mistake!
 
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