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+--- Thread: SPN 1231 fmi 9 (/showthread.php?tid=5055)
SPN 1231 fmi 9 - johnnyboy2500 - 09-13-2019
Peterbilt 386, 2013 is throwing code (spn 1231 fmi 9). After researching the after treatment is not communicating with acm. Going to check the wires and connection. So my question is do I need to replace after treatment wiring harness? And has anyone else ran into this problem? [/size]
RE: SPN 1231 fmi 9 - Rawze - 09-13-2019
what kind of engine? miles? some history?