Recently bought a 2016 Titan. Well the low fuel pressure service fuel system warning came on. Replaced both fuel filters and primed system as required. Now it’ll start but it cranks numerous times before it does, the fuel system warning is still on and when i drive it just a few miles the check engine light comes on along with reduced power. Everything I’ve been reading I’ve come to the conclusion it’s a lift pump issue?? I want to order one but 900$ without knowing for sure is a lot. Any ideas?
2016 5.0 low fuel pressure, now reduced power mode
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I went and hooked it up to a machine, there was no code. All it said was to service fuel system. I changed fuel filter under truck, primed 2x then changed fuel filter under hood and primed 2x. Is there something I’m missing? Why would that send it into reduced power mode?
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Well for one change lower file filter first then change upper filter, no prime in between. Secondly, I would go out and prime it about 3 or 4 times. I always do mine 4 times then go drive after the last one. I have never in 4 years had your issue.
Perfect, that’s what i did the first time was prime the lower then the upper. I’ll go prime it 6 or 9 times right now, drive it a bit and I’ll let you know what happens.
okay just went and ran it through the prime process 4x…. Started it and within 200feet the engine power reduced warning came on. Is there a way to reset the warnings?
I used the scanner at autozone and it brought up nothing except maintenance. I’ve been reading that the orings are an issue maybe i should order a couple new ones and try that. What do you usually lube them up with? And can you over tighten them??
So that’s what i used, i saw other people using petroleum jelly but i figured fuel would be fine. I think I’m to the point to where it’s probably something a little more than i can figure out.
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Yup. I use white lithium grease every time. Change primary first run shutdown do secondary.
I’m going to see if i can get new o rings tonight and I’ll let you fellas know what happens.
Okay come to find out my neighbor is a semi mechanic, he put his personal code reader on the truck and it read a code p009e. A fuel pressure control circuit. So im narrowing it down.
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Well there ya go, sounds like your neighbor is the perfect guy to have around right now lol
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If you or someone changed the filters WITHOUT disconnecting both battery negatives, your pump was damaged.
Same thing happened on my 2016 XD. Mine ran for a week before crapping out. Put the new pump in, end of problems.
I read that the 2016 pumps had issues and were easy to damage. The replacement pump was a newer model.
If anyone has a good diesel mechanic in the Los Angeles area please let me know.
Stay away from Top Notch Diesel. About 2 years ago they were great. All the old management is gone.
The new crew is,,, I'd rather not say. Just beware.
Good luck with your truck!
That’s good to know! I didn’t disconnect anything! So i probably damaged it.
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If it makes you feel any better, I damaged mine doing it the same way.
And I paid 1750.00 to have a shop diagnose and repair it.
Check out this guy's video
He has a lot of interesting tips which I have followed.
I run a Scan Gauge II as he suggested and I believe it will help me keep my truck healthier longer.
Knowing that my turbo is running at 500+ degrees is important if I'm at my destination and ready to shut down.
Also knowing when you're in a re gen is important to protect all kinds of sensors, etc.
I also learned my transmission is running too hot and I'm in the process of addressing that.
I've had a love/hate thing with this truck from the beginning mostly due to the dealer.
These mechanics DON'T know what they're doing. Especially since Nissan discontinued this truck.
However, being educated about these things will help prevent failures. And when this truck runs right, IT'S AWESOME.
Good luck friend!
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I owned a 2017 XD DIESEL for 179,000 miles. I got the low fuel pressure warning a number of times but it was always because I had less than a 1/4 tank of fuel. If I kept it above a 1/4 tank it never gave me the warning, this happened especially happened between when my miles until empty showed 50-80 miles, I never went under 50 miles because of the warning and I don't like going that low anyways. May not be related to your issue, it's just the experience I had with mine.
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