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Old 11-10-2023, 05:29 PM   #1
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Cummins 400 CEL

On a trip and just had fuel filters changed. Check engine light comes on when going up inclines only. Smoking more then usual and some loss of power. All gauges good and doing fine on flat road. Any ideas out there
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Old 11-11-2023, 06:30 AM   #2
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First thought for something like that is clogged primary fuel filter ( even if, or maybe especially if, you just had filters changed)
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Old 11-11-2023, 08:30 PM   #3
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" Smoking more than usual " ?

That would lead me in the direction of plugged air filter ( or another restriction in air intake ) or lack of turbo boost .

Cummins manufactures multiple engines with 400 HP.

Do you know what engine series you have ? ISC ? ISL ?
Exhaust brake or compression brake system ?
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Old 11-12-2023, 07:37 AM   #4
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Changed fuel filters again. Air filter is good. Same thing still happend. Pulled into a Speedco to read computer. 2 1/2hr wait. He said it sounded like an injector stuck open. Told me if that's the problem they couldn't fix it anyway. Directed me to a Freightliner shop 5 minutes down the road. So here we sit till Monday
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Old 11-12-2023, 08:27 AM   #5
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Did they get any codes?
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Old 11-22-2023, 10:27 AM   #6
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Back on the road

Codes 2215 and 449. Many steps to follow. Ended up being fuel pump.
No complaints about TAG Truck Service Jackson TN.
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Old 11-22-2023, 11:56 AM   #7
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A diesel has two "fuel pumps", one a lift pump to help move fuel from the tank to the filters and the other the high pressure injector pump. Do you know which they replaced?
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