Duramax Power Reduction

hyattjlbb wrote:
Not sure if this is the right place to post so admin please move if needed.

96 degrees, mountains of North Carolina/Virginia. Climbing around Fancy Gap on I-77 and with no warning truck says "power Reduced". Dropped to 15 mph towing the below 5vr up the rest of the hill. Gauges all good, DEF good, fuel filter good. Nothing giving me any warning or explaining the power reduction.

Could it be that the heat and climbing just put the system in to reduction to protect it?

I shut of the engine later at the nearest exit/gas station and it reset and pulled fine the rest of the 30 miles to Wytheville KOA where we are overnight tonight.

Any ideas?

I had the same thing on my 2015 duramax as well. Only happened when pulling long grades at WOT.

In my case, it illuminated the CEL and stored codes P0234, P2263, and P2599 which have to do with turbo overboost condition.

In my case it was caused by a loose intercooler pipe clamp. In your case I would read the codes and do a boost leak test. Couldn't hurt. The air flow and pressure sensors in the trucks are incredibly fussy and expect values within a narrow range.

See here for more if you have the above codes: http://www.duramaxforum.com/forum/11-16-lml-duramax-powertrain/909297-p2599-p0234-p2263-codes.html#/topics/909297