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Hi, I'm Robert. Welcome to JustAnswer. I'm reviewing your question now and will post back with your reply momentarily.
This is a difficult one but if the check engine warning came on and the on-board computer said loss of power module it can be voltage related, it could be a loose connection on the circuit or even if one of the battery cables was loose or corroded. I have seen some cases where the cables appear to be tight but you can pull them off by hand, so make sure they are tight. IF the voltage was cutting off for a split second the electronics can get confused and the first thing you would see before anything else is the warning lights, it could be in the main harness as well for the engine computer so that should also be inspected.
Having the codes will take all the guess work out and save time and money in the long run and is smart to have them pulled.
Let me know if you need more help on this...
Not sure on that number normally you will have a MID, PID and FMI number if it is the engine it would be 128 84 1
MID 128 Engine
PID 84 Road Speed
FMI 1 Data Valid but below normal operational range
This fault is set active when the ECM loses a vehicle speed signal when other engine conditions indicate the vehicle is moving. The fault can also become active if there is a series of clutch, service brake or throttle movements with no vehicle movement. The fault is set inactive when the ECM receives a vehicle speed signal greater than zero. Possible causes are a failed VSS, (vehicle speed sensor) broken wire in the circuit etc...
I am assuming the the MID is the 128 for the engine.
Hope this helps out, a shop should be able to track this down. Robert