Needing help with a sporadic p 1689 code. It's the only code I get and it only when I have been driving for a good bit. (Daily 20min drive to work won't trigger it) vp44 is new ish. (2 years may maybe 50k miles) was from DAP and was one with a supposedly rebuilt pump "brain"

I have gone through the really helpful guide on this website. Everything tested good except the step on the ECU. Im shure it could be the ECU but want to rule everything else out. Fuel pressure looked good on the quadzilla ecu voltage looked good tps was steady.

Truck drives fine but will suddenly go through a fit* and cut in and out then be done and drive fine. It has recently started to rev on start up then drop back to idle.

I do have the passenger side battery removed and the ground cable grounded to the fender. (First thing i checked reads 1 ohm to the driver battery negative) the tps is a cheaper Amazon part. But has been reset and set to the proper voltage range properly. And tracks smoothly on the quadzilla so I don't think that's the issue. Really not shure what else to check on this

That's good news, as well as an inexpensive fix. I should replace my fuel pump relay just because it is the original and has logged almost 400,000 miles. No sense of waiting for it to become a problem - especially, an intermittent problem.

Thanks for posting the fix.

• John

Thanks for marking the thread solved. 😊