ESP Faulty, Brake Faulty, Power Steering Faulty...

[mpellegri]

Hi there,
this morning I turned on my C5 X7 (2011, 68k) and after 20meters I had an ESP faulty message, and right after the Faulty brake message intermittently. I was suspecting a bad ABS sensor but after 5/10 minutes I received a power steering faulty message.
I suspect some water contamination but, after all the afternoon in the sun, the messages came back on the way home, again in the same sequence...
I find the faulty brake pretty annoying since it turns off the tachometer and the odometer, which I find more dangerous than helpful (is that normal???).

Any suggestion on what could be happening? Everything seems to be working fine, so I am a bit clueless.

I appreciate any suggestion!
Thank you!

Matteo

[mickthemaverick]

First thing I'd look at is the battery condition and then the fuses in the main fuse box. These random, apparently unrelated, faults are often down to electrical glitches.

[mpellegri]

The battery is new and I checked the fuses recently, since the wipers stopped working last week and then started working again...

I'll check again though! Thanks!

[Sl4yer]

Had similar issues on a C3 some years ago. The ABS ECU had failed, triggering a range of faults in other equipment (some requiring a signal from the ABS, and some just downstream on the bus).

Bear in mind that the ESP and power steering may require a speed signal from the ABS computer. So you will lose any power steering speed variability with the error. On the C3 the actual speedometer broke too!

I have no knowledge of the X7 specifically, but it's probably worth getting a diagnostic check.