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Discussion Starter · #1 ·
I have got a 2003 Crew Cab 4x4 Cummins and it is cutting in and out when im driving down the road like it isnt getting enough fuel. But I just changed the fuel filter 100 miles ago. It doesnt ever quit and idles fine but when its warmed up and going down the road it will just go to idle and you can push the pedal to the floor with nothing happening but then you can let completely off of it and then press it again and it will come back to life and start pulling and running like normal or sometime it takes a couple times of pressing the gas to get it to pick back up but it never cuts out if you get on it hard. When it picks back up its all of the sudden. After it does this for awhile it will throw the check engine light but it goes off after you change the fuel filter. Im so confused on what this can be I dont know if its the lift pump of injection pump or a throttle position sensor or what? Any help would be truely appreciated!!! Thanks
 

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Discussion Starter · #3 ·
Oh ok thanks. Its throwing codes P0839, 2121, 2122, 0837
 

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P2121 P2122, APPS failure.

check the APPS wiring, if ok
then replace APPS
don't get one from dealer, way overpriced.
search on forum for lower cost aftermarket supplier
 

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Discussion Starter · #5 ·
Sorry I am new to cummins and what is the APPS and where is it located so I can check it?
 
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