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so now that I got a PO603 code before I change out module what needs checked.Car was backed into by a truck knocked the bumper off it's side brackets (97 deville)
 

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DTC PO603 Control Module Long Term Memory Reset

If the battery has been disconnected for any reason DTC PO603 wil set The PCM keeps a running check on the memory, if memory changes it resets. An intermittent loss of power or ground to the PCM will cause a reset.

I have received this DTC several times (it always sets if I have disconnected the battery) and just clear the DTC and see if it returns. Good luck!
 
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