[baja]

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)

 

[MWA]

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!

 

[baja]

thanks MWA I will give that a try