Have them check the engine ground wires. I had a similar problem after about 1000 miles. After a day in the shop, it was a unattached (not broken) ground strap. Good luck. Brett
Today my 3 week old - 2800 miles Chevy Silverado 3500 Duramax Allison
> 4X4 dually had a BIG PROBLEM, while driving the following occurred. >
> the engine light, the abs light and the brake light went on - the
> speedometer stayed at zero while moving - the allison trans stayed in
> 1st gear only - the display said "Service brakes" I had to drive on
> the Penna turnpike at 15 miles per hour with the engine running at > 2k...
>
> If I stopped and turned it off, and then restarted it, it did not
> shift into gear immediately...
>
> I went to a chevy dealer - the tech said the diagnostic unit showed to
> many error/problem codes... he spent 5 hours and didn't solve the
> problem... he was in contact with the GM tech line people. they
> thought it was a small part which they got from another dealer nearby.
> That did not fix it. Now they think it is a control unit of some sort
> on the allison trans. could not get one nearby - expect it to be
> delivered from GM next week...
>
> anyone have a problem like this??? please email me at speedijim @@@@ > rcn.com