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"understeer is when you hit the wall with the front of your car, oversteer is when you hit the wall with the rear of your car, horsepower is how hard your car hits the wall, and torque is how far your car moves the wall."
More than likely it is an overboost code. The motor likes to see a range of boost during operation and with a tuner, boost is increased a bit and if the high limit of boost is exceeded, code for this can be triggered and sometimes the PCM will also defuel the truck. Good thing is that this is a soft code and the SES light will got out after a few minutes. Remedy? I believe a company (i forget) sells something called a boost annihilator to fool the map sensor. I haved learned to live with it though.
watchtower, white whale, land yacht, big pig...
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