RamDiesel10

I got a p0191 replaced the frp sensor changed the fuel filter at the same time and drove it 3 days and the light came back on with the same code again! I have a friend that works at dodge and put it on there computer to make sure I have the latest software installed and he said I did so not sure if that includes and tsb or reflashes that may fix the problem has anyone ran into this code and what did you do resolve it. Thanks

Mexstan

What year and model of truck? Any modifications?

RamDiesel10

The truck is a 2010 2500 trx 4x4 package all stock 6.7L

BigIron70

The only way I was able to get rid of this code was pulling all 6 injectors. I sent them out to be tested and they came back with different variance codes on the injectors. These are the codes that the PCM uses to adjust fueling. I programed these new codes into the PCM and it fixed problem. This was second repair attempt after I had replaced the FPS, which did not fix the problem. The fuel tested good no contamination, and the fuel return from injectors was in spec. Fuel injector tubes were all torqued to spec and fuel limit valve tested good. The fuel return from CP3 pump was borderline so I replaced. Was still under warranty. All and all a difficult code sometimes to diagnose. Cummins stopped using variance codes in 2013 on the 6.7 diesels. The cost for testing 6 injectors was only $300. The cost to replace just 1 injector is $1600.