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Po 605 code


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Does anyone know how to deal with this code? I have a SCT tuner with a custom dyno tune which is updated and this control modular code keeps coming up after I clear it. I haven’t had any issues before untiI I took it out of storage a month ago. The Battery was on a tender all winter.


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Did you look up the code?  It says it's a ROM checksum failure.   How old is the battery?  Mine was always on a tender but after 7 years even thought the tender claimed all was OK, the tell tale sign on the Ford GT was intermittent gauges.


It could also be caused by a faulty ground.  Make sure the ground cable from the battery is making a good connection. 

Edited by twobjshelbys
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