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davidmystic2

Lexus GS ABS Traction Problem

Hey I'm having a weird issue with my 2009 Lexus GS hybrid. The ABS lamp lights up, and I'm getting traction problems. Basically, the ABS system seems to be failing. I've got almost 250k km on the clock. Could this be a faulty input from a sensor? I've checked the ECM for any obvious issues, but haven't found anything yet. Any ideas?

4 comment(s)

dominik_taylor10

Sounds like a speed signal fault. The ABS, traction control, and even the transmission rely on that signal. Since it's a hybrid, could the inverter be playing a part? And have you checked the wheel speed sensors themselves for damage or corrosion? They are usually the first suspects.

davidmystic2 (Author)

Hmm, the inverter... that's a thought I hadn't considered. How would a problem there manifest itself in this kind of issue? And if the wheel speed sensors were at fault, wouldn't a diagnostic tool pinpoint that?

dominik_taylor10

The inverter could, theoretically, introduce electrical noise that interferes with the speed signal being sent to the ABS module. While a diagnostic tool should pinpoint a wheel speed sensor, sometimes the fault is intermittent, or the signal is just weak enough to cause problems without throwing a specific code. Considering all the symptoms together, I'd say it's most likely a defective control unit. I'd suggest having a workshop take a look.

davidmystic2 (Author)

Thanks for the advice! I took it to a trusted workshop, and you were spot on - it was a defective control unit. They replaced it, and it cost me around 1000€. Everything's working perfectly again. Really appreciate the help!

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