So my car one morning would not start, when i turned the key, everything lit up just fine and normal, fuel pump engaged and everything, yet when i would try to turn it on, it would not crank, and wouldn’t start. I ran codes on it, and it came up with “invalid data from ecm/pcm - invalid serial data received” and another code “control module- system internal failure” i have checked the ecm connections, brand new battery, and everything else connection. the car was dyno tuned, yet i don’t have a tuner in the car itself. I am now lost. If anyone has had this problem, i am FULLY open to suggestions. Thanks!

 

Welcome.

If You Have Not Already a 15 Minute Battery Disconnect Would Not Hurt To Try!.

Check Through The 303-14 Section Post 1. It Maybe Helpful. Also PATS Section Post 3

https://themustangsource.com/forums/...e-info-550475/

Also I Would Check The SJB For Any Signs of Water Intrusion.

https://themustangsource.com/forums/...on-sjb-550481/

KC


Check Out The Module Overview the PDF!