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On Sunday I installed a trailer wiring harness on my 2006 Volvo XC90 V8 4.4 -- When connecting the wiring to the cargo area fuse box, via the power stud, the wrench tapped the frame and sparks flew. Now when the car is started there is an immediate error that the 'anti-skid service required' -then- after driving for a bit of time I see the 'Power system service urgent' with the red triangle and battery light. The battery voltage measured 12.3 while the ignition is off and a constant 13.5 when the ignition is on. Also (and not certain if this is relevant), the clock and trip meter reset each time the car is turned off and on. Most forums indicate that the 'power system service urgent' is typical of a failing alternator but I do not feel this to be absolutely correct given the circumstances of the trailer light installation as well as the constant 13.5v when ignition is on.
What else could cause the power system service urgent error?
Is there a means to diagnose that the CEM is at fault?
I also went through and took the DTC codes from the dash 'trick' :
DTCs set for:
Not checked for: