Fuel pump control module keeps failing

Bought a high-mileage (182,000) 2015 Tundra 4.6 V8. Clean Carfax report with all services done on time at Toyota dealer and had it checked over by my mechanic. Love the truck, but after about month it refused to start. Classic crank but no start. The only place who could get me in was local Midas shop. They diagnosed it as a bad fuel pump, but still didn’t start. They said my fuel pump control module was also bad. $1800 later and I was driving home. I filled up the tank then the next day it threw a check engine light. I took it back and they said it was a bad solenoid. Drove it home at the CEL came on again. Brought it back and they replaced the solenoid again. CEL came back on again. Brought it back and they said the fuel pump they replaced had a crack. They replaced it with another pump and the evap codes went away and stayed away. Ran fine for 5 weeks then it died again driving home. Had it towed back to Midas and they said the FPCM had failed again and they replaced it, again. They said if it failed again, I needed to take it to the Toyota dealership because the problem “went deeper” than they knew how to fix. Well, on the way home it stalled and would not start back up. Now I’m stuck and don’t know what to do? Should I take it to the Toyota dealer or to my local auto shop (with really top notch mechanics)? Should I demand they replace the failed FPCM or refund my money since it didn’t even last a day? Does anybody have any idea what might be causing the modules to die? My suspicion is that they nicked a wire somewhere while replacing the fuel pump, but I’m not sure. All fuses and relays are good. Should I just bypass the FPCM? If so does anybody know how to do that? I have the single six-blade plug. Love the truck but super frustrated.

 

Hmm this one is definitely a tricky situation. To be honest I myself only know how to fix simple mechanical problems (unfortunately) but I am sure someone here has faced a similar situation before. Someone can figure out the solution the question is how much are you willing to pay? right. It's a cost benefit analysis you have to conduct including the factor of time. Whatever you end up doing I wish you goodluck Matt and hope this situation gets cleared up quickly for you.

 

Have you ever figured out what was wrong with the fpcm. I am having the same thing on my 4th one in 6 months.

 

Sounds like you should go where one of the mecanics have strong electrical skills ! Dont take it to a shop where mecanics are only ''parts swapper'' like your midas shops seems to have !

I personally would look for the wire pins out , values and routing and get thru all of them one by on and mesure Omhs , voltage, ground points etc

Computer should be use and data log monitor and work from there ! it should not be a too much time consuming problem to fix, if you take it to the proper shop : the FPC wiring seems pretty basic in our trucks !

I would inspect all the pins and connector : It might be as easy as a loose pin or some corrosions in the connectors: I have repair MANY electricals nightmare issues and weird multimeter reading with cleaning, retight pins tab and use dielectrical grease in the connector. sometimes big problems are very simple fix, when its not an obvious problem like a whole corroded wires , or a ground thats rotten to death !

 

As stated above

check the connector very very thoroughly
Replace with oem part
If you can, get one of the failed units and get inside to see if something is burned up.

after that the problem is either upstream or downstream.

too much resistance in pump connections
System commanding too much fuel thereby working FPCM harder
Some sort of under voltage condition going into FPCM.

 

Here is a link to what sounds like a very similar situation, maybe worth looking into.

https://www.youtube.com/watch?v=miNUy43Qy48

 

I’ve having this problem. Replaced the module and it drove fine for about a month then started doing the crank but no start. Luckily I found this thread and watched the video u/Lostinthewoods posted. My god did that save me from spiraling into depression. I crawled under and wiggled the wiring harness and it started right up. Now it has done this to me and after touching the harness it will start right up.

Have any of you guys replaced the wiring for the module? Not sure if I can replace just one part of the wiring diagram or if I should do every part.

 

Thank you for this. You saved me with this video!