What is this code?
02-07-2019, (Subject: What is this code? ) 
Post: #4
RE: What is this code?
SPN 639, Fail 7 Is no communication between the Engine ECM and other modules. Check for an inline fuse blown for the ECM between the batteries and ECM as well as your relays. Verify you have power and ground to the ECM (MCM) and if so you likely have a faulty module if it is not communicating.
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Messages In This Thread
RE: What is this code? - Nilao - 02-07-2019
RE: What is this code? - Nilao - 02-07-2019,



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