2005 V70R code U0002 and Immobilizer Warning

[darrinm503]

Fun day today, not. While driving on a spring break trip with the family, the wagon surged while climbing a hill and the check engine light illuminated, the tach went to zero, the coolant temp indicator went full cold, the anti-skid warning message illuminated, and the D for drive became a - (minus) sign on the dash. It was pretty windy and rainy but no other issues. Previous repair was the RF axle for a wobble. We stopped the car at a convenient location (in front of an auto parts store) and read the code as U0002, High Speed Controller Area Network Communication Bus Performance (confirmed). When trying to restart the car, the Immobilizer Warning popped up and the car was subsequently towed to a shop that could hopefully diagnose and repair the problem. Anyone have experience with this code or Immobilizer warning?

[doublebug]

Faulty DEM, Flooded CEM, BCM usually can cause this.