Fault Code U0401-64 - Signal Plausibility Failure / Fuel Mon not ready ECU->TCM
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Fault Code U0401-64 - Signal Plausibility Failure ECU->TCM / Fuel Mon not ready
Hey Everyone, cross-posting from another forum in the hopes to help increase visibility. So after sending my LR4 to the dealer to diagnose theproblem I'm having here, they determined after about a week that it was the fuel injectors misfiring/weak spray on one bank (1,3,5,7). Additionally, I've been unable to get the truck inspected due to incomplete emissions monitors (Fuel, EGR, Cat, O2, EVAP), even after almost 5k of driving.
In the process of getting a quote, I found an indy who though this was odd, especially since its unusual for an entire bank to go and that 5 of my emissions monitors are not ready, preventing me from getting inspected.
He had me come down so he could run some diagnostic and after some time he uncovers:
In his experience he would find it strange that the ECU would be something which would need replacement so we're both digging around the web to see what we can find.
Anyone dealt with their fuel system monitor not kicking in?
Further digging into the workshop manual recommends that I look a little more into any codes thrown by the ECU which requires a return to the indy as I don't have gear like that. Some research on unrelated auto forums might also suggest a re-flash of the PCM as a solution for the Fuel monitor.
Any help or thoughts are appreciated.
Thanks
In the process of getting a quote, I found an indy who though this was odd, especially since its unusual for an entire bank to go and that 5 of my emissions monitors are not ready, preventing me from getting inspected.
He had me come down so he could run some diagnostic and after some time he uncovers:
- There are no misfires
- The fuel system monitor should be one of the emissions monitors that should immediately gets ready the minute the car starts, which it this case, it's not.
- Fault code U0401-64 which indicates that the TCM isn't getting any data from the ECU (the dealer did not uncover this code)
In his experience he would find it strange that the ECU would be something which would need replacement so we're both digging around the web to see what we can find.
Anyone dealt with their fuel system monitor not kicking in?
Further digging into the workshop manual recommends that I look a little more into any codes thrown by the ECU which requires a return to the indy as I don't have gear like that. Some research on unrelated auto forums might also suggest a re-flash of the PCM as a solution for the Fuel monitor.
Any help or thoughts are appreciated.
Thanks
Last edited by therinse; Dec 7, 2020 at 02:05 PM. Reason: Title required editing
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