2015 Jetta Cruise Control Problem

[HowTo]

Hi All

From day one I had CC problems.
There are a couple of guys in AUS and Turkey that have the same problem. VW has not found any solution to this problem.
When you see this attached picture you know you have problems.

My problem got solved by getting a new replacement car. Collected new car yesterday. My old car had 1500km on the clock.

Video:

https://www.youtube.com/watch?feature=player_embedded&v=ntvHLyRZBdo

 

[Beachless]

Rouxenator will be here shortly to assist.

 

[$m@Rt@$$]

Well at least the car tells you there is something wrong with the cruise control

 

[LinuxMan]

Good on VW replacing the car, and not giving you uphill.

 

[Rouxenator]

Good on VW replacing the car, and not giving you uphill.

That is nice of them, however seeing as they don't know what is causing the problem it is probably best for them to keep the car with the issue and try troubleshoot it. If they find a solution they can fix it should it affect other cars in future. It is a lost cheaper that swapping out more cars.

 

[HowTo]

That is nice of them, however seeing as they don't know what is causing the problem it is probably best for them to keep the car with the issue and try troubleshoot it. If they find a solution they can fix it should it affect other cars in future. It is a lost cheaper that swapping out more cars.

Morning they are selling that car for R70000.00 less.
If it is fixed? or waiting to get direction from Germany VW.

The guy from Turkey, the dealership did more parts swapping. Voltage problem on one of the boards, firmware, steering wheel, Refitting steering wheel and changed module on steering wheel.
The guy from AUS had similar things done. His car is at the dealership for the last 7 days.
Once they started swapping boards from a different Jetta, all warnings lights came on. So they kept the car for longer.

By me they did one firmware upgrade, did not work. They had the car for more then 15 working day's could not even replicate the YouTube video. I showed that once to them on my own vehicle. This happens most of the times weekends and afterhours when staff is not available.

 

[Drifter]

Shows you the value of a Jetta and the cost of parts. It's cheaper to give the customer a new car than to fit replacement parts. So glad I dont drive a VAG product.

 

[HowTo]

Shows you the value of a Jetta and the cost of parts. It's cheaper to give the customer a new car than to fit replacement parts. So glad I dont drive a VAG product.

Then again how many people test all functionality on there car. I did, from they one it did not work.
You have the consumer protection act behind you, 7 day window period return the darn thing, if it is not working.
You pay a lot of money for a item.

 

[Rouxenator]

I doubt that it is software, they run the same firmware in lots of cars without trouble. My guess would be some sensor not behaving correctly, if it has to do with speed it could also affect other features in the car. Other possibility that people often overlook is the presence of devices that tap into the CANBUS, typically tracking or other telemetry devices, which can upset some of the features of the car.

 

[HowTo]

I doubt that it is software, they run the same firmware in lots of cars without trouble. My guess would be some sensor not behaving correctly, if it has to do with speed it could also affect other features in the car. Other possibility that people often overlook is the presence of devices that tap into the CANBUS, typically tracking or other telemetry devices, which can upset some of the features of the car.

Hello I did have a tracking device in. This now got moved to the new vehicle. New one is fine so far.
The guys from AUS and Turkey don't have things installed like that. I did ask them.
Don't think tracking device would tap into CANBUS, voltage point is required. Anyway CANBUS is a industrial bus that has shielding, to protect external interference.

My guess would be some sensor not behaving correctly, if it has to do with speed it could also affect other features in the car.

This sensor thing might be the problem. Don't know how many sensors are required to get CC working. There were no other problems just CC not working at times.

 

[Rouxenator]

There are many different types of tracking devices in use, most common place are ignition driven ones that only need to be wired up to one wire (ignition) and it makes use of a built-in GPS to calculate speed. Other units have serial interfaces that you can connect to the CAN (typical two wires) and then the tracking unit is loaded with the required CAN filter for the vehicle/ECU to listen for certain messages like speed, rpm, seatbelts, diff-lock and pretty much anything you can imagine. Modern vehicles usually have multiple CANs (controller area network) with bridges between them.

Your typical CAN based tracker is connected to the same CAN bus as the instrumentation cluster as it interested in the messages sent on that bus.

tl;dr I don't think in this case it is a CANBUS monitor issue.

 

[Fazda]

Shows you the value of a Jetta and the cost of parts. It's cheaper to give the customer a new car than to fit replacement parts. So glad I dont drive a VAG product.

No, I disagree.

Having spent quite a while in the Industry, when you have a problem on a new car that is not a quick fix, it is much easier to keep the customer happy and work on the car in your own time.

The net result is a happy customer and someone who will come back in the future.

We replaced two Jeep Grand Cherokee's last year - both cars were fixed at a later stage, but both customers were much happier in their new cars.

It's not a major loss to the company either, as the "fixed" car can now be put into the demo fleet, and a factory rebate can be attached to it. In the end the car is sold as a demo, and nobody is the wiser.

 

[HowTo]

No, I disagree.

Having spent quite a while in the Industry, when you have a problem on a new car that is not a quick fix, it is much easier to keep the customer happy and work on the car in your own time.

The net result is a happy customer and someone who will come back in the future.

We replaced two Jeep Grand Cherokee's last year - both cars were fixed at a later stage, but both customers were much happier in their new cars.

It's not a major loss to the company either, as the "fixed" car can now be put into the demo fleet, and a factory rebate can be attached to it. In the end the car is sold as a demo, and nobody is the wiser.

As you said a happy customer is a happy customer in the long run.

 

[Fazda]

As you said a happy customer is a happy customer in the long run.

Well it is a win win situation in the end, as an unhappy customer is quite likely to destroy your reputation with ease, and there is no actual loss involved for the dealership, buy supplying you with a new car, plus they gain very positive advertising - people talk, plus the joys of Facebook and Twitter - bad can chop you off at the knees in a couple of days!

 

[HowTo]

Hi All

It seems Turkey will replace the other gents Jetta, after consultation with his lawyer.

The other gent from AUS they gave him a option for trade in, he is taken a KIA. Dealer principle is currently arranging with VW to pay for his taxes etc.
That dealer ship trades with all sorts of cars.

They say that Germany is currently with level 4 busy with CC not working.

 

[Archer]

This sensor thing might be the problem. Don't know how many sensors are required to get CC working. There were no other problems just CC not working at times.

It is not a sensor issue if your speedo is working correctly. And it should only require two sensors - transmission output speed and gear selection.

 

[Colin62]

It is not a sensor issue if your speedo is working correctly. And it should only require two sensors - transmission output speed and gear selection.

For a simplistic cruise control all it needs is the speed.

For a fully integrated one, it will also need a signal from the ESP to ensure that it's not revving the crap out of the car when there is no traction - I'm pretty sure it will disengage if you skid. It might be designed to work with input from the each wheel. Many new ones use the brakes to keep the speed down when you're going downhill, and I'm pretty sure it will need some feedback from the ABS system too for that, as it's using the brake assist to apply the brakes.

In the old days you could stick in an aftermarket cruise control which just had a speed sensor and a vacuum assisted throttle control, but the modern ones are fully integrated into the car's design and will use whatever information is available to make their operation smoother and more economical.

 

[Archer]

For a simplistic cruise control all it needs is the speed.

For a fully integrated one, it will also need a signal from the ESP to ensure that it's not revving the crap out of the car when there is no traction - I'm pretty sure it will disengage if you skid. It might be designed to work with input from the each wheel. Many new ones use the brakes to keep the speed down when you're going downhill, and I'm pretty sure it will need some feedback from the ABS system too for that, as it's using the brake assist to apply the brakes.

In the old days you could stick in an aftermarket cruise control which just had a speed sensor and a vacuum assisted throttle control, but the modern ones are fully integrated into the car's design and will use whatever information is available to make their operation smoother and more economical.

Think about this carefully
Wheels skid -> trans output speed will rise. So why the need for sensors on the wheel?
Going too fast downhill? -> Leads to an output to the ABS from engine/trans ECU. Again, no need for additional sensors. I suspect this will only be on adaptive cruise cars, but I can't be sure, I don't have that information available.

In fact I just checked the AEBs for the engines we design around - hardware required: CC on/off switch, CC set/resume switch, vehicle speed. That's it. Now sure, you could get vehicle speed from a sensor on each wheel, but I know on our vehicles this is transmitted over J1939 or hardwire (PWM signal) from the transmission which uses final drive ratios and tyre sizes to calculate vehicle speed from trans output speed and the gear it is in.

Now if you need adaptive cruise then yes, there will be far more sensory goodness required

 

[Rouxenator]

What is bothersome is that the dealers are taking the cars back instead of just plugging it in to see what the actual error is. Unless they did that and it is a serious one?

 

[Archer]

What is bothersome is that the dealers are taking the cars back instead of just plugging it in to see what the actual error is. Unless they did that and it is a serious one?

I only watched the video now...
I can think of about 8 things that could cause this, only one or two of which could be fixed quickly. So while it may not be serious, it can still be time consuming which brings us back to the point Fazda made.