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I have noticed the same thing with the start button. I finally figured out I can depress the brake pedal further after the preheat is in progress and then it will start up like normal.

It looks like my low boost problem is solved. I replaced two sensors and cleaned one. I replaced the MAF sensor, it probably didn't need to be replaced as it was perfectly clean. I replaced the MAP sensor, it was completely encapsulated in soot. I cleaned the Exhaust Manifold Pressure sensor and...

I have not corrected the problem as of yet. I hate to start buying parts without knowing if they will fix the problem. Salt farmer had the same issue, he replaced the MAP sensor. Is there a test procedure for the MAP sensor?

Thanks for your response, I'll check on the sensor. I have another question, does the truck have a sensor to monitor exhaust gas temp? Could the engine cut the boost to protect itself from high EGT? Would a 5" exhaust lower EGT better than my 4" exhaust?

The truck has not showed an error code. It has failed on me 5-6 times with no codes. I finally watched the turbo boost screen while pulling my camper, that's when I saw that when it got to about 22 psi boost that the engine will shudder and then I can't get above 9 psi until I stop the engine...

I have not tried that but read about doing that when I started looking for the reason for my problem. Makes sense. Thanks

I have not contacted the tuner, I would like to hear if other Ram owners who has possibly seen this issue on their trucks.

I have a 2022 Ram 2500 6.7 Cummins, It has been deleted with no HP increase above stock. The engine runs great when unloaded, if I accelerate quickly the turbo boost will go to the 12-14 range with no issues. The engine performs perfectly when using the exhaust brake. When towing my 13,000 pound...