Engine died at 75 mph

Al Trimbur

Asked by Jan 11, 2016 at 10:05 PM about the 2007 GMC Yukon XL Denali

Question type: Maintenance & Repair

2007 Yukon XL Denali w/ 6.2. Well maintained
vehicle, stopped for gas, got back on highway.
About a mile later, loud, rapid knocking/ banging
sound from under the hood (sounded like fan was
hitting something), engine dies while at 75 mph.
Drift to shoulder, pop hood, everything looks to be
intact, no fluids on the ground. Wait a few minutes,
crank it and it catches for a few seconds, but
barely, it's obviously struggling to get going, but can
hear loud knocking (like two metal objects hitting
each other) then dies again. Any suggestions?

4 Answers


Did your oil light come on? You may have a bad rod bearing. The noise is called a rod knock.

Best Answer
Al Trimbur

No warning lights at all. It's been a mechanically sound vehicle. It's been maintained religiously. I'm very taken aback by the situation. Thanks for your input.

Bob Beaman

Sounds like something broke in the bottom of the engine. Not good....


Torque screws for the transmission

Your Answer

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