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sound like transmission got too hot.if you try for a long period of time keep spinning tires trying get out of mud you will burn out transmission bands and drive forward friction plates.when stuck in mud or snow dont keep spinning tires for traction will burn out transmission.
Continuous Memory Diagnostic Test Code (DTC) P1270 has a generic description of "Excessive Engine RPM/Vehicle Speed". This DTC indicates that the vehicle was operated in a manner which caused engine or vehicle speed to exceed a calibrated limit. Possible causes for this DTC are: > Wheel slippage caused by mud, snow, water, ice. etc. > Excessive engine RPM in Park or Neutral > Vehicle driven at an excessive rate of speed
If you are aware that one of the possible causes above occured, then there is no problem. If there are no other drivability symptoms or fault codes, simply clear the code and move on.
okay the truck must be at a stop and shifter in neutral then you can shift into 4wd, this is for snow or wet conditions but more for snow and ice, the 4wd low is for lets say you are stuck in snow or mud this is to get you out its for low speeds only or climbing a hill in mud or snow, not to often is the 4wdlow used.and then 2wd is for all driving conditions, the thing is the 4wd needs some slippery conditions for example driving in 4wd on dry roads puts alot of pressure on the trany drivetrain and the transfer case, the wheels need to slip sometimes to give way in 4wd, hope this helps good day.
under 35mph its normally recommended that you utilize 4 wheel low it is good for maximizing the torque needed to pull out of deep snow. Moderate-Aggresive Mud and Snow tires also work hand in hand. ~Daniel.