v6 2.5 auto Cruise Control not working

fabian · 14th March 2020, 05:14

hi there,

I have done some research but still looking for a solution. The Cruise Control on my v6 2.5 AUTO somehow stops working.

The center console cruise switch (master switch) seems ok, it turns green after pressing the button.
The steering wheel control does not work, no matter I pull or set. the system does not engage. I couldn't see the yellow Cruise Control light on my dashboard.
I have adjusted Brake Switch as recommended by most of the posts. It still the same. (v6 2.5 AUTO only got one Switch? let me know if I'm wrong)
fuse checked for both glove box and engine bay, all good.
when Cruise Control was still working, I can hear a little click sound from the bottom of the passager side when I pull or set buttons on the steering wheel and then the yellow Cruise Control light on, system working. But now, not anymore. I couldn't hear any sound when pull or set buttons.

I hope these descriptions make sense.

Any advice??

Richard

minty2 · 14th March 2020, 07:30

I have exactly the same problem with mine only in my case, it’s intermittent. Having ruled out the brake switch, I think it’s likely to be a vacuum release issue with the petrol models’ cruise control safety mechanism. I believe there’s a gaitor near the throttle body that may be damaged or loose that needs attention. I keep meaning to have a look and your post has given me a prompt. I’ll let you know what I find.

Quote:

Originally Posted by fabian

hi there,

I have done some research but still looking for a solution. The Cruise Control on my v6 2.5 AUTO somehow stops working.

The center console cruise switch (master switch) seems ok, it turns green after pressing the button.
The steering wheel control does not work, no matter I pull or set. the system does not engage. I couldn't see the yellow Cruise Control light on my dashboard.
I have adjusted Brake Switch as recommended by most of the posts. It still the same. (v6 2.5 AUTO only got one Switch? let me know if I'm wrong)
when Cruise Control was still working, I can hear a little click sound from the bottom of the passager side when I pull or set buttons on the steering wheel and then the yellow Cruise Control light on, system working. But now, not anymore. I couldn't hear any sound when pull or set buttons.

I hope these descriptions make sense.

Any advice??

Richard

fabian · 14th March 2020, 08:26

Mine was intermittent at the beginning but one day it just gone completely. such a paint ass

Quote:

Originally Posted by minty2

I have exactly the same problem with mine only in my case, it's intermittent. Having ruled out the brake switch, I think it's likely to be a vacuum release issue with the petrol models' cruise control safety mechanism. I believe there's a gaitor near the throttle body that may be damaged or loose that needs attention. I keep meaning to have a look and your post has given me a prompt. I'll let you know what I find.

Arctic · 15th March 2020, 17:06

Worth checking the fuse behind the glove box (41) I think it is 10amp are your reverse lights working also? as the same fuse is for those.

smudge.g · 16th March 2020, 04:32

Do you have any issues with front ABS sensors?? I managed to snap the nearside front ABS wire whilst chnaging the coil spring and my cruise stopped working. When i had a similar intermittent ABS fault on the offside front, the speedo and fuel guage started playing up (now all sorted)!!

thanos.m · 16th March 2020, 13:14

I think its either going to be vacuum related probably a vacuum leak or wheel speed sensor if you have abs issues or wheel speed sensor issues the cruise control will not engage at all

Rick-sta · 16th March 2020, 13:18

had this issue on my v6 and a local member's v6 as well. Both turned out to he the ECU for the cruise had failed. Replaced the ECU on both cars and that got the cruise working. The ECU is located behind the glove box.

fabian · 17th March 2020, 02:22

Quote:

Originally Posted by Arctic

Worth checking the fuse behind the glove box (41) I think it is 10amp are your reverse lights working also? as the same fuse is for those.

fuse checked for both glove box and engine bay, all good!! anything else I need to check?

fabian · 17th March 2020, 02:27

Quote:

Originally Posted by smudge.g

Do you have any issues with front ABS sensors?? I managed to snap the nearside front ABS wire whilst chnaging the coil spring and my cruise stopped working. When i had a similar intermittent ABS fault on the offside front, the speedo and fuel guage started playing up (now all sorted)!!

the speedo is fine. Actually, it was not working last year. After changing the front ABS sensors, the speedo come back. The cruise was working fine until last few weeks.

fabian · 17th March 2020, 02:31

Quote:

Originally Posted by thanos.m

I think its either going to be vacuum related probably a vacuum leak or wheel speed sensor if you have abs issues or wheel speed sensor issues the cruise control will not engage at all

the abs was not working for ages (more than 5 years i guess). but after abs stopped working, the cruise was still working perfectly until this few week.

how to check vacuum leak?? and how to bring vacuum back again?? i will probably start from this first.

14th March 2020, 05:14	#1
fabian Regular poster Rover 75 Saloon Join Date: Feb 2010 Location: Brisbane Posts: 56 Thanks: 1 Thanked 2 Times in 2 Posts	v6 2.5 auto Cruise Control not working hi there, I have done some research but still looking for a solution. The Cruise Control on my v6 2.5 AUTO somehow stops working. The center console cruise switch (master switch) seems ok, it turns green after pressing the button. The steering wheel control does not work, no matter I pull or set. the system does not engage. I couldn't see the yellow Cruise Control light on my dashboard. I have adjusted Brake Switch as recommended by most of the posts. It still the same. (v6 2.5 AUTO only got one Switch? let me know if I'm wrong) fuse checked for both glove box and engine bay, all good. when Cruise Control was still working, I can hear a little click sound from the bottom of the passager side when I pull or set buttons on the steering wheel and then the yellow Cruise Control light on, system working. But now, not anymore. I couldn't hear any sound when pull or set buttons. I hope these descriptions make sense. Any advice?? Richard Last edited by fabian; 17th March 2020 at 02:36..

15th March 2020, 17:06	#4
Arctic Give to Learn Freelander 2 Join Date: Aug 2010 Location: West Midlands Posts: 18,716 Thanks: 1,155 Thanked 6,407 Times in 3,874 Posts	Worth checking the fuse behind the glove box (41) I think it is 10amp are your reverse lights working also? as the same fuse is for those. __________________ Arctic Givology Learn to Give Everything is Achievable ad altiora tendo. Check out our Nano meet dates http://www.midlandsnanomeets.co.uk/ http://www.the75andztclub.co.uk/index.php?thepage=howto " You do the work , we supply the expertise "

16th March 2020, 04:32	#5
smudge.g Gets stuck in 75 Tourer CDTi Connie SE Join Date: Jun 2017 Location: Keith, Banffshire Posts: 686 Thanks: 431 Thanked 132 Times in 105 Posts	Do you have any issues with front ABS sensors?? I managed to snap the nearside front ABS wire whilst chnaging the coil spring and my cruise stopped working. When i had a similar intermittent ABS fault on the offside front, the speedo and fuel guage started playing up (now all sorted)!! __________________ My 75 Tourer CDTi was born Saturday, 21st June 2003 @ 09:50 My 75 was the 18,749th 75 Tourer to run off the production line, out of 27,407 It was the 195th 75 Tourer CDT Connoisseur SE (135) to be made out of 2,074 and the 1,789th 75 Tourer in Wedgewood Blue Metallic (code: JEL) to be made out of 1,871 Wedgewood Blue Metallic 75 Tourers

16th March 2020, 13:18	#7
Rick-sta This is my second home MG ZT 2.0 CDTI+ in Typhoon, MG TF 135 in Typhoon & Rover 75 Connoisseur CDTI SE in Pearl Black Join Date: Oct 2012 Location: Norfolk Posts: 7,534 Thanks: 2,718 Thanked 2,827 Times in 1,462 Posts	had this issue on my v6 and a local member's v6 as well. Both turned out to he the ECU for the cruise had failed. Replaced the ECU on both cars and that got the cruise working. The ECU is located behind the glove box. __________________ How to retrofit Cruise Control on a diesel with no OEM wiring in place: Link How to retrofit heated electric memory seats with no OEM wiring in place: Link How to operate FBH and ATC via text Link How to restore cloudy projector headlights Link

16th March 2020, 13:14	#6
thanos.m Avid contributor Rover 75 saloon Join Date: May 2019 Location: West Sussex Posts: 223 Thanks: 54 Thanked 41 Times in 26 Posts	I think its either going to be vacuum related probably a vacuum leak or wheel speed sensor if you have abs issues or wheel speed sensor issues the cruise control will not engage at all