ABS wheel sensor failed

[jqp]

I'm almost sure an ABS wheel sensor has failed. ABS, tyre pressure warning and traction control lights illuminating. Info display also reports front assist not working. Start/stop not working.
After 7 years and 50,000 miles this is to be expected. I have 2 questions for which I would welcome advice/opinions.

1. I have a 2-year all-in service plan. Can I expect the warranty to cover the repair cost?

2. Currently in France, not due home for several days. Am I wise to consider this non-urgent?

 

[willwander]

I'm almost sure an ABS wheel sensor has failed. ABS, tyre pressure warning and traction control lights illuminating. Info display also reports front assist not working. Start/stop not working.
After 7 years and 50,000 miles this is to be expected. I have 2 questions for which I would welcome advice/opinions.

1. I have a 2-year all-in service plan. Can I expect the warranty to cover the repair cost?

2. Currently in France, not due home for several days. Am I wise to consider this non-urgent?

Ours also went while in France.
yes, it’s non-urgent, just be mindful you will have no abs braking, the loss of automatic cruise control while in France is the biggest PITA.
Ours goes off and comes back on intermittently and has done for the last 3 weeks.

 

[jqp]

Ours also went while in France.
yes, it’s non-urgent, just be mindful you will have no abs braking, the loss of automatic cruise control while in France is the biggest PITA.
Ours goes off and comes back on intermittently and has done for the last 3 weeks.

Many thanks for swift response. Dont have ACC so good. No ABS not a problem either. Before the Cali, I had a T25 Westy. No ABS, very tail heavy! I drove it for 30 years and 180,000 miles. I still react to emergencies with cadence braking.

 

[jqp]

Just ending the story. My cheap OBD reader showed no output from O/S rear wheel speed sensor. Dealer has now replaced that sensor - all good. Cost covered by all-in plan warranty. Plan has now paid for itself!

 

[tedgina]

I'm almost sure an ABS wheel sensor has failed. ABS, tyre pressure warning and traction control lights illuminating. Info display also reports front assist not working. Start/stop not working.
After 7 years and 50,000 miles this is to be expected. I have 2 questions for which I would welcome advice/opinions.

1. I have a 2-year all-in service plan. Can I expect the warranty to cover the repair cost?

2. Currently in France, not due home for several days. Am I wise to consider this non-urgent?

Have the same problem on our T6 waiting to we get home .the dashboard lights are on and off more off at the moment. Could it be a dirty sensor ?

 

[pjm-84]

Have the same problem on our T6 waiting to we get home .the dashboard lights are on and off more off at the moment. Could it be a dirty sensor ?

Nope

 

[secret lemonade drinker]

ABS works on magnetic flux (hall effect transducer), unless your muck has iron fillings in it, dirt should not affect it's operation

 

[tedgina]

ABS works on magnetic flux (hall effect transducer), unless your muck has iron fillings in it, dirt should not affect it's operation

So it's like the sensors in the roof which fail from time to time.

 

[secret lemonade drinker]

Don't know, I was a second class California owner, the beach mandraulic roof never leaked or failed.
I would have thought the roof sensors given their switching frequency would have been magnetic reed switches, hall effects work a lot faster so switch on and off a lot more times in a short time period creating a pulse train rather than on and off once for a roof raising operation

 

[tedgina]

Nope

just took out the rear right sensor it was full of some sort of white grease and muck.I cleaned the sensor ring inside and replaced the sensor with a new one .Also did the left side this was a lot cleaner,while i was at i checked the front ones right side was dirty left side clean.All faults cleared no warning lights on dash.

 

[pjm-84]

The sensor error starts intermediately until it becomes too annoying and that's when I changed mine. Yep they are in a dirty location and thus they can be difficult to remove. Hence they are a sealed unit

 

[vbk1975]

Don't know, I was a second class California owner, the beach mandraulic roof never leaked or failed.
I would have thought the roof sensors given their switching frequency would have been magnetic reed switches, hall effects work a lot faster so switch on and off a lot more times in a short time period creating a pulse train rather than on and off once for a roof raising operation

The roof sensors are Hall Effect, used as position sensors with magnets mounted in the sensor housing and they are triggered by the internals of the ram reaching the sensor. The generic failure mode is water ingress into the magnet housing , which starts to swell and become intermittent. Set up as a two wire device and the roof ECU measures the current through the sensor.

 

[secret lemonade drinker]

The roof sensors are Hall Effect, used as position sensors with magnets mounted in the sensor housing and they are triggered by the internals of the ram reaching the sensor. The generic failure mode is water ingress into the magnet housing , which starts to swell and become intermittent. Set up as a two wire device and the roof ECU measures the current through the sensor.

Overly and needlessly complicated, a magnetic reed switch would be far simpler, cheaper and more reliable, most industrial rams use micro switches internally as soft end stops