i got a 03 dodge diesel 2500 5.9 and it is acting like it starving for gas but the check engine lite is not on but i hooked a scan tool to it and it gave me a 623 code

15

Asked by Jan 05, 2012 at 06:58 PM about the 2003 Dodge Ram 2500 SLT 4WD Quad Cab SB

Question type: Maintenance & Repair

3 Answers

12,655

you need to replace your fuel lift pump. it brings low pressure fuel from the tank into the fuel filter bowl. i recommend going with an aftermarket style unit such as a FASS pump

2 of 2 people found this helpful.
15

ya that is what i was thinking it was but my scan tool was saying it was a blind code. I dont know it was weird most of the time it will say like bank one rich or something like that

1 of 1 people found this helpful.
12,655

p0623 is low voltage detected at the lift pump. id invest in a new code reader if all it was telling you was the code. But your lift pump is to blame, theyre notoriously bad on the 03-05 trucks because theyre right on the back of the fuel filter bowl and get alot of engine heat. 06-present the lift pump is now an intank style. you really have two choices, go to the stealership and pay them roughly 500-1200 dollars to retrofit your truck to the 06-present style lift pump. or go to Genosgarage.com and buy a FASS fuel pump.

1 of 1 people found this helpful.

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