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2008 XC70 NA 3.2L AWD. 218,000 kms.
This problem started happening approx 1 month ago.
About every day I drive the car, the following cycle occurs: I drive along like normal, and after a few 90 degree left turns I have to make on my work commute, I notice my speedometer flashing up and down (4 or 5 times) between 0kph and whatever speed the car is travelling at, during the left turn. Usually one left turn later, after the speedometer waving up and down, I get a few driver messages all at once - Brake Failure Stop Safely, DTSC failure service required, and Parking Brake service required. As soon as this happens I experience about a 40% drop in power, especially noticeable when starting off from a stop.
A few other things of note:
- The gear indicator on the instrument cluster shows a dash (-) instead of D for drive, etc.
- When shutting the engine off, occasionally the 'start' button requires multiple presses before it will shut down.
- After the engine turns off, occasionally the key itself requires multiple presses into the ignition before it will release the key.
- I recently replaced both front sway bar links because the original ones had broken off from the top end where they were bolted to the hub assembly. The passenger side one was fully broken off and not connected by any material at the top, driver's side was still 50% attached at the top. One theory of mine is that the loose link had dragged a speed sensor wire out of its stable connection but upon inspection seems intact.
- The negative battery cable is partly corroded and I am awaiting a replacement from Amazon.
- This is the only electrical issue I have. Everything inside the car works - stereo, A/C, windows, etc.

If you have had a similar issue with your p3 xc70 I'd be interested to know how you fixed it or what you determined to be the cause. I suspect there is a bad speed sensor somewhere or a short causing the chain reaction of symptoms but any insight would be greatly appreciated.
 

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Hi there, have you ever figured out a way of of your issues?

I've started having something similar:

First my internal temperature sensor fan has always been making intermittent noise, more like a humming sound every few seconds. I never paid much attention to it. Recenlty, about 1-2 weeks ago, this noise became louder and almost thumping. This continued for last 1-2 weeks and then, the center console’s sound system, started to reboot itself and rebotted itself several times during a trip. The next morning, the sound system didn’t turn on at all when the car was started AND, the humming sound was gone - the temperature sensor fan seemed to no longer run. Then, at some point, the audio system came back on, along with temperature sensor fan.

The next day, when I started the car, the dashboard was full of warning messages: parking brake, SRS, brake failure, low tire pressue indeicator was on. I drove off and the car was running 100% normal from mechanmical perspective. As I was riding, the dashboard seemed to have a life of its own, every now and then it would go black, RPM/Speed indicators would drop to zero, come back with various warning messages which then would go away to display as normal. Throughout this, audio system never came back. Also, when I shut down the car, the dash would stay on. Then after few restarts, it would shut off.

Thanks so much in advance and please help with any pointers!
 
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