What are the probable causes of DTCs P0442 and P0449?
Im getting codes 442, 449pd. the truck has no power. i can get up to 40 mph then it will not go any faster. it will shift in to high gear 3000 rpm, but won"t go. i had other codes that came up, but was to clear them outafter some repairs, & they did not return, only codes 442, 449pd came back. any ideas
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Does your car have an overdrive or economy mode? 3000 is about right if you're going uphill at 60, your car is under heavy load or your not in overdrive. It could also be that your car hasn't shifted up to the next gear. On many automatics you can stomp on the gas pedal twice quickly, all the way to the floor, and that will make it up shift. Try that to see if that lowers the rpm's and gets it to shift up. If your car still wont up shift check the transmission fluid level with the car warmed up and running.
one unit that operates ratio changes and is connected to the engine is that vacuum operated actuator on the transmission
it is possible that that unit is failing , vacuum hose is leaking and that will cause ratio changes as the vacuum varies
run the fault codes to check for wiring problems or VSS or TCM problems as well