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2001 chevy duramax, sending code p1041, what is this? severe lack of power tranny doesent want to shift sometimes but it feels like it does not want to shift because of lack of power, any help will be great.
 

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There's no P1041 code for MY01 but there is a U1041 code. This is a Class 2 ABS State of Health Failure. Basically it means the ABS module is not communicating. One of the things the Allison does when it's not getting an ABS signal is to delay some downshifts and prevent lock-up from coming on. However, it shouldn't result in a lack of power other then the converter slip.
 
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