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thanks brett once again

thanks brett, are they expensive to fix?? The P2544, code looks like this P2544 Signal A For Torque Management Request Input

hi all, I have these codes come up on my 2008 Calais, could any help with what could be wrong with my car?? P2544, P0850, P0420, I have the description of what they are but how do I fix them?? THANKS Dan