new to dodge and now big issue.
 

well i got the great code of death. the P1689. as so do many many other people i have seen but for what is going on with my truck only one guy has had one of the issues im having. think it was ( stodg ) no increase in throttle over 1400 regardless of throttle position. so after many nights of searching for cures on this code ive come up with,

VP44 = toast (EDC board)
Wiring
Lift pump
grounds = driver side and other places
Engine ECM

but here is the history on the truck, and i will try to do the best i can with the issues on the truck and what i have done to fix it.

truck is a 99 5.9 with the banks ottomind kit

I bought the truck from an old boss of mine who takes good car of his stuff. i knew the truck had an issue which at first i thought a trans but no. he said that the mechanic he took it to said bring it back to stock and see what happens. i took the truck for a test drive drove fine and all. then went to hammer on it after a brake stand and it derated. code came up and I let off the throttle, then tapped it, then back on and it drove fine. went back said okay and drove the truck back to my shop.

hooked it to a Genysis scanner and read all the codes that were on there. the ones i remember were crank and cam sensor not agreeing, no response from atmospheric pressure sensor, and some others and the 1689. I erased them then thought to myself "that was a bad idea". after work drove the truck back to my old bosses shop to help a friend. went to leave and thats when it started throwing its fit.

the truck idles and starts no problem its just after that point. it would take off then cut out, come back then cut out. nooooo balllsss. thought to myself "hmm this is weird, well ill get to it when i get to my old mans place and look at it there" found nothing that stood out besides some half ass wiring. but when i went to leave, i started the truck and it rockets to 1400rpm then came back down. drove the truck back to my work. still cutting out and couldnt get out of its own way.

now that i have had some time to work on it wiring fixed except for one. tried to poke around with the wiring and removed the ottomind tuner. wasnt sure what i was looking for besides continuity and normal visual what not. so the truck is serviced and all up to good on that. but the truck is still throwing the 1689 BIG F U code. :humm: , now after messing with it, the throttle is touchy like touch it it jumps fast and all, it still cuts out and is slow to rise on r's. so at this point im telling the truck to kiss my :moon: ive swapped the relays, made the pins smaller on the VP pump connector to make them contact better, basically just shy of taking a hammer to it. but i went to drive the truck after all this hooplah, and in neutral i could get it to hit rev limiter no issues, then to a brake stand it and it just falls flat on its face no higher than 1400rpm and in normal driving too. soo said eff it and I went to put the truck away today cause i was tired and fed up at this point and the truck brings up a new issue. the peddle became a decellorator. put it to the floor it goes to idle, let off rockets to 1400. sooo i dont know where to sink my money first to only regret it cause it wont fix it. i got such high hopes dont i.

ive seen 90% of threads say "i replaced the pump and its fixed" and some saying "pump didnt do it, nor did the other 40 things".

so after reading my novel could anyone have a "its this" answer. or do i have a headache ahead of me?

i am having the same almost the same exact problems. i am pulling the injection pump to warranty it out and hopefully that fixes it.

when you replaced the pump did it fix it the first time? or did you have these issues then replace the pump with no change?

Switch your fuel pump relay and see if that fixes anything. Usually there is only 2 causes for the 1689 code(bad relay or pump) Its pretty much the vp death code. What is your fuel psi at?

i bought the truck like it is a little over week ago

yeah i switched them, no luck in change. dont have a gauge so dont know lift pressure. but then i took one of the brass plugs out to prime the system it shot a stream about 8-10'' up.

after you switched them did you clear the codes?

my vp44 died with only the p1689 code, but there should be another code in your ECm or PCM.

Vp44 trucks NEED a fuel pressure gauge. Cant tell you for sure what to check until we know the psi. If it has a stock lift pump the vp is most likely gonna be toast. Anything under 10 psi wot is bad and slowly killing the vp

i got that, there isnt a schrader valve on top of the filter base or any of that so not sure where to connect a gauge?. but i doubt a lift pump is going to make my peddle be in reverse mode.

Trace the fuel line from the bottom of the fuel filter to the vp there is an 1/8" npt port on the banjo fitting with a plug in it. That is where you hook a gauge to. Your vp44 is probably bad. When you replace it it would be wise to put a fass, airdog, or raptor lift pump on as well. Here is some more reading and test procedures for you VP44 Diagnostic

Bryce is right. Mine is a T right before the ip about 6in away. With a mechanical gauge you need to put in a needle valve so it doesnt put a water hammer effect on the gauge and mess it up. Some guys dont like though of having diesel running into the cab for the gauge so you can use a isolator which will use antifreez to the gauge instead of diesel. Without a good lift pump the stock one(ones mounted on the block even more so) After the years of towing and driving they wear out and dont supply good psi and cool fuel to the vp which in turn kills the vp. When they go they will do all sorts of wacky things. You can try and do a apps reset but I doubt its gonna fix the problem.

ok i'll have to get one of them and try it. i planned on getting the edge tuner after all this stuff.. doesnt that measure lift pump pressure?

Yes it does. Some people dont like it as its a electric item that measures everything. So if it were to quit working you dont have anything to look at or alert you that something is high or low. I have the older edge juice in my truck which tells me everything it hasnt gave me any problems but still something you should look at. I think my next tuner after my edge dies will be a quad adrenaline much more customizable.

thats fine. im just stumped on this whole issue.. i will start by ripping out the harness and take it all apart and look for problems there and do a sweep test on the TPS with with ohm meter and if both of them turn out then i can safely assume its the ECM or pump.

i just put a injection pump on my truck and it didnt fix it.

I really can't help you with your problem, but I can relate a story from a cummins owner that had a similar problem. It turned out to be a corroded connection at one of the plugs going to the Vp or ecm. sorry I cant remember which one. The corrision wasn't necessarily visible, The mechanic that was working on just started taking all the connections loose and cleaning them, then he found the one that was causing the problem. And it fixed that truck. After reading your posts this sounds like your already going down that path anyways. good luck.

i got a used ecm today so we will see if that does it.. i didnt pull any of the pin recepticals out of the main plug to the ECM but i checked for continuity from the main plug to the pump connections and other and all checked out. soooo we will see if this does it. ill let you guys know..

thanks barry if i have to check again i will go there.

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went through the wire harness all checked out and replaced the ECU. still the same issue.. only difference is in gear or under load she bogs down then jumps back and lopes a bit. and still no high idle. guess its the pump..