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I have a 2016 Laramie. Bought it three years ago with 54k and last mileage recorded was 119k. Four or five months ago, I took it to the local CDJR dealership for recall replacement of the injector pump. Up to that time, I'd been getting an average of 22+ mpg overall, with excursions up to almost 30mpg on long trips - all taken prior to the recall replacement. After the recall, I started getting low fuel pressure codes, with some engine stalling. Over the ensuing four or five months, the Dealership replaced the fuel injection pump; the injectors; the fuel runs; cleaned the lines. During this time, the vehicle would run fine, generally, with only slight lag in acceleration. One day, it refused to start. Had it towed to the dealership; they fiddled with it for two months & finally told me the piston rings had failed on two cylinders and they want $20k to replace the engine.Have an intermittent code popping up. Engine light comes on intermittently then clears after 5-6 starts. Research it can be any number of things withing fuel system. Don't know where to start. Fuel pressure test?
Code reader states low pressure fuel injector pressure. Truck performs normal I did install a Pedal Monster 3 years ago which eliminates the lag on acceleration. It has 4 modes stock, city, sport & track. I keep it in sport mode for normal acceleration instead of EPA lag. CDJR replaced HPFP in 2022 for recall part. Thanks for your post.I have a 2016 Laramie. Bought it three years ago with 54k and last mileage recorded was 119k. Four or five months ago, I took it to the local CDJR dealership for recall replacement of the injector pump. Up to that time, I'd been getting an average of 22+ mpg overall, with excursions up to almost 30mpg on long trips - all taken prior to the recall replacement. After the recall, I started getting low fuel pressure codes, with some engine stalling. Over the ensuing four or five months, the Dealership replaced the fuel injection pump; the injectors; the fuel runs; cleaned the lines. During this time, the vehicle would run fine, generally, with only slight lag in acceleration. One day, it refused to start. Had it towed to the dealership; they fiddled with it for two months & finally told me the piston rings had failed on two cylinders and they want $20k to replace the engine.
Online search gives various symptoms before piston ring failure; I experienced none of them that I could identify. At this point, I don't know what to believe, but it perhaps may be a caution to you for your situation.
I am in NE Ohio. Regular diesel shops won't touch the ECOsSounds like cp4 is on the way out. You’d have to do a fuel pressure test of the lift pump to see what it’s outputting. Where are you located I may be able to help out
I got those same codes & only those codes.Code reader states low pressure fuel injector pressure. Truck performs normal I did install a Pedal Monster 3 years ago which eliminates the lag on acceleration. It has 4 modes stock, city, sport & track. I keep it in sport mode for normal acceleration instead of EPA lag. CDJR replaced HPFP in 2022 for recall part. Thanks for your post.
Here in Va I had the same problem. They’re not bad to work on yourself if you have the capability and can source the procedures online.I am in NE Ohio. Regular diesel shops won't touch the ECOs