CTS stopped working while driving! Now engine locked? Why? How?

Asked by Jun 21, 2016 at 04:21 PM about the 2006 Cadillac CTS

Question type: Maintenance & Repair

After driving 1.5 hours, CTS turned off radio and AC with message related
to battery.  Then "service brake assist" disabled(?) message.  Then
dashboard went blank (speedometer died, everything "off).  Car cut off.  
Lucky to reach side of road, previously travelling at 65mph.  Nothing
electric worked.  Key stuck in ignition.  Could not jump off.  With other car
connected, I could remove key and let down windows, etc (electrical
worked).  Without connection, everything dead.  Dealership saying motor
locked down.  But what does that have to do with electrical?  How
connected?

2 Answers

31,395

Engine could of had internal parts failure locking it up. When the engine stopped running it resulted in the error messages on the dash. Pull the oil dipstick out and look at the oil, that may tell you something. How many miles on this Cadillac?

oil change less than month ago. battery less than 3 months old. 100G miles. Dealership now saying the belt on the alternator was locked. And locked the entire engine down. Not sure if this is the answer either.

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