sophiewagner27
Terracan ABS Speed Signal Fault
Summary of the thread
A 2002 Hyundai Terracan is experiencing ABS system failure, indicated by the ABS lamp lighting up and traction issues, due to a speed signal fault. The problem may stem from a faulty ABS sensor or more likely, a defective ABS control unit, which is crucial for reading wheel speed and preventing wheel lock-up during braking. Diagnosing and replacing the control unit requires specialist software and a workshop, with an estimated cost of around 1000€.
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4 comment(s)
sophiewagner27 (community.author)
I had a diagnostic but they weren't very helpful. Just said "speed signal fault" and shrugged. How did you figure out it was the control unit? And is that a difficult thing to replace?
rudolf_ice1
The speed signal is what the ABS system uses to work out if your wheels are slipping. If the control unit can't 'read' the speed correctly, it throws a tantrum. I had the same error code. In my case, it was indeed a defective control unit. Replacing it isn't super difficult if you're mechanically inclined, but coding it to the car definitely requires specialist software and a workshop. Cost me around 1000€ all in.
sophiewagner27 (community.author)
Sounds like I'm heading to a workshop then. Thanks for the info! At least now I know what to expect – 1000€ for a new control unit it is!
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HYUNDAI
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TERRACAN
rudolf_ice1
I had something similar happen on my Terracan. ABS light, traction control going nuts...sounds familiar. Have you had a diagnostic done? It could be a faulty ABS sensor, but it's more likely the ABS control unit itself. The speed signal is crucial for the ABS to function correctly; it uses wheel speed sensors to detect if a wheel is locking up during braking.