help please spn 520372 FMI14

445209

{"text":"check engine light came on and DEF light blinking... can't find the code anywhere on google. power derate to 55mph ... all other gages are in perfect levels ","videos":"[]","link":"{}","pics":"[{\"description\":\"\",\"height\":2312.0,\"name\":\"\",\"url\":\"\",\"width\":1042.0}]","canComment":true,"externalShare":false}

820767

{"replyTo":"","text":"I was at peterbilt shop when I seen this so I asked if they knew and he said you must have a Detroit it most likely just needs a software update","replyToPid":0}

445209

{"replyTo":"

820767 发表于 2020-09-02 01:58:37 I was at peterbilt shop when I seen this so I asked if they knew and he said you must have a Detroit it most likely just needs a software update

","text":"thanks man. i had to change the entire DEF components cost me big","replyToPid":395531}

655965

{"replyTo":"","text":"What was the problem?\n\nMy suggestion was going to be your DPF doser. ","replyToPid":0}