Hello everyone, this is my first post after reading through several threads and being unable to find any solutions so apologies first if I've done something incorrect.

I have an XC70 2004 plate. It's been absolutely reliable for the past 10 years with regular servicing, new shocks, springs and other wear and tear being replaced as required.

In the past week, without an obvious pattern... the ABS warning light comes on at the same time as the Brake Warning Light, after a few seconds the trip computer also dashes-out (------). The car still drives completely fine, other than these faults also seem to disable the cruise control.

If I stop and turn off the engine the above sometimes clears for the rest of the journey, other times they stay on. This morning I drove 40 miles with the warning lights on. All the way back they stayed-off!

About 3 months ago, only the ABS warning light came on and my garage replaced a faulty sensor when it was time for the MOT and there's been nothing up until the past week or so.

Any help or suggestions on where to start would be greatly appreciated.

 

You first step would be to scan the car with a compatible scanner. Then follow a rational diagnostic path.

It is common for the ABS control unit to develop cracked solder joints inside causing your symptoms. Many have been fooled by the codes stored - Codes that refer to the wheel sensors are common - but the problem is not with the sensors, it's with connections inside the control unit.

That control unit is "coded" to the VIN of the car so whether you replace with new or remanufactured, software to make it work will have to be installed also. A company such as zemodex.com (an many others) offer repaired ABS control units that will be plug and play. A new ABS control unit would require a software download using VIDA.