GLE Diesel low tire pressure warning leads to unexpected problem

The symptoms you describe suggest a more serious issue than just low tire pressure, although the initial warning could be the first sign. The ABS, steering vibration, and power steering failure are concerning. While a faulty tire sensor can trigger a warning light, it wouldn't cause the other mechanical issues. I own a GLE myself and experienced a somewhat comparable situation. Have you considered the possibility of a defective valve within one of the tires? Such a defect can result in gradual pressure loss, which might not be immediately apparent upon visual inspection, yet still trigger the warning system. This can subsequently impact the vehicle's handling and potentially affect the ABS and power steering systems due to the vehicle attempting to compensate for perceived instability.

A defective valve, huh? I hadn't really thought about that. I was too focused on finding a punctured tire. How would a valve problem cause all those other issues with the ABS and power steering though? Is there a direct link, or is it more of a knock-on effect from the pressure loss?

The ABS and power steering systems are highly sensitive to discrepancies in wheel speed and overall vehicle stability. Gradual pressure loss due to a defective valve can indeed create subtle differences in rolling resistance between tires. The vehicle's systems may attempt to compensate, leading to increased strain on the power steering and triggering the ABS unnecessarily, especially during turns or braking. I would suggest that you promptly consult a qualified technician to inspect the tires, including the valves, and diagnose the underlying cause. Ignoring this issue could lead to further damage to the vehicle's systems. I ended up having to replace a valve and recalibrate the tire pressure monitoring system.

Okay, thanks for the advice! I'll get it to a workshop ASAP. It's booked in. Turns out you were spot on, it was a defective valve in the end, causing a slow pressure loss. They replaced it and recalibrated the system. Cost me 280€ all in. At least the shaking and the ABS light are gone now!