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Discussion Starter #1
I am wondering if anyone else has had this same problem and know what may be the issue? On a 6 hour drive to Los Angeles, my 69,000 miles, 2004 Volvo XC 90 experienced a severe "thump" in the front end, which was then followed by a very brief (split second) internal (meaning dashboard lights, hi-fi, dome lights, etc) power failure. Initially, the power failure would last only a split second and then car would continue running as normal, and there we no error codes or check engine lights that came on. This happened as many as five times in a 6 hour drive.

On the last long drive home, the "thump" was harder than usual, and the lights internally completely went out, hazard lights could not be turned on, blinkers could not be switched on, hi-fi went out, etc (though the electric windows would work).

I pulled over, and turned the car off and restarted it, and the yellow exclamation point dashboard icon/alert lit up, and a service message flashed referring to the anti-lock brake failure, and that the SRS needed to be checked.

I have it at another dealership in Northern California, who seems equally mystified and have told me that they dont think the error code of check the SRS is going to fix the problem.

Any advice you can offer would be appreciated. Thx, Brad
 

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Same thing happened to me 04 xc90 t6 124,588 and counting , a service message flashed referring to the anti-lock brake failure, and that the SRS needed to be checked.also airbags and it lost power, I pulled over, and turned the car off and restarted it drove fine and did it again, took it to a dealership everything was fine until they checked the battery and some of the cell were bad it caused false error messages so have them test the battery
 

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I had similiar symptoms as well. However, once I restarted the car, it would happen again, sometimes multiple times on the same trip, but the computer would not retain an error code, so the service dept could not trace it back. Eventually I found the answer online, it was a CEM failure, that could only be replicated by running the car, and placing direct heat onto the chip/module (using a blow dryer). At first the $1220 estimated cost wasn't going to be covered by warranty, but then they figured out that the CEM also controlled the emissions levels as well, so it was covered.
 
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