2007 Chevrolet Silverado 3500 6.6L Duramax with engine code P0234

Question

the code was set pulling an 8000# trailer up a 7% grade at about 50 mph. After 3 keys were on and off the check engine light went off but the P0234 code was set.

Answer 1

You must drive your vehicle more for the Powertrain Control Module to retest the turbocharge system. If the problem persists, you must replace the turbocharger to fix the problem.

P0234 Chevrolet Code - Engine Overboost
Read more: https://www.autocodes.com/p0234_chevrolet.html