OBD2 throwing codes and odd groaning at 900 - 1000 RPM

[soup7_20]

I'm looking for some advice regarding my 2024 PB. I bought it used with 4,000 miles, and it now has 13,000.

I've had a bad feeling about it from the start. Immediately after purchase, the door latch sensor failed and wouldn't register that the door was closed. The dealer fixed it, but it was frustrating to have a problem so early.

Now, I'm dealing with a constant, distinct groaning sound whenever the truck is between 900-1000 RPM. It's an unnatural sound, so noticeable that even my wife, who isn't a car person, comments on it. On top of that, my OBD2 scanner is now showing error codes. I brought this up with the dealer, but they were dismissive, saying the codes were "generic" and not to worry about.

My plan was to keep this vehicle for at least 150,000 miles, with a stretch goal of 200,000. But with these issues, I'm losing confidence that it will be reliable long-term without me sinking a lot of money into future repairs.

I'm thinking of trading it in, probably for a non-hybrid model. What would you guys do in my situation?

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[Snakebitten]

It doesn't matter which modern "FNV" vehicle you purchased, if you run a full scan for all codes, you are going to be haunted by "soft codes" that you otherwise would be unaware of.

It's literally designed for something much more akin to logging, rather than the traditional DTC code associated with a necessary repair.

Got a Windows based pc? Ever open the Event Viewer?

Don't let those soft codes worry you or you will be haunted.

As for the groan between 900-1000 rpms, are you talking about when you are parked and idling? It would be unusual for the truck to be rolling at those rpms.
If you were monitoring the HV System Current PID, I wonder if you would witness the groan as coinciding with the electric motor being in generator mode and charging the HV battery?

I know that during that ~60amp/300V load there IS a noticeable feedback of NVH, especially at idle. Groan is a fair description too, although I'm sure it's possible for the groan to be more pronounced on 1 truck vs another.

Do an experiment and put the truck in Tow Haul mode in order to keep the engine running even after the HV battery is fully charged to ~63% SOC. Does the groan go away as soon as the charging load is gone, yet the truck is still idling between 900-1000rpm?

Also note that you can enable ECO Idle (I think that's what Ford calls it) in Sync4 and it raises the idle to 1300rpms when charging the HV battery. Perhaps that would diminish or eliminate the groan you describe?

 

[soup7_20]

It doesn't matter which modern "FNV" vehicle you purchased, if you run a full scan for all codes, you are going to be haunted by "soft codes" that you otherwise would be unaware of.

It's literally designed for something much more akin to logging, rather than the traditional DTC code associated with a necessary repair.

Got a Windows based pc? Ever open the Event Viewer?

Don't let those soft codes worry you or you will be haunted.

As for the groan between 900-1000 rpms, are you talking about when you are parked and idling? It would be unusual for the truck to be rolling at those rpms.
If you were monitoring the HV System Current PID, I wonder if you would witness the groan as coinciding with the electric motor being in generator mode and charging the HV battery?

I know that during that ~60amp/300V load there IS a noticeable feedback of NVH, especially at idle. Groan is a fair description too, although I'm sure it's possible for the groan to be more pronounced on 1 truck vs another.

Do an experiment and put the truck in Tow Haul mode in order to keep the engine running even after the HV battery is fully charged to ~63% SOC. Does the groan go away as soon as the charging load is gone, yet the truck is still idling between 900-1000rpm?

Also note that you can enable ECO Idle (I think that's what Ford calls it) in Sync4 and it raises the idle to 1300rpms when charging the HV battery. Perhaps that would diminish or eliminate the groan you describe?

Your statement about a full scan is absolutely fair, and I align with it.

About the groan, your right its mostly always at idle or when i'm going under 5MPH and my foot either isn't on the throttle or its lightly on it. I'll give your experiment a shot.

 

[Lefty665]

I'd not let it be too much with you.

Electronics tend to have early failures then long stable lives. The door latch sensor seems to fit that description. That you've done 9k miles, more than twice what it had when you got it, without further failures means you're beyond that early failure peak.

Looks like Snakebitten put a pretty good finger on the groan, it's part of the HV charging cycle. Perhaps not a feature you would choose to have, but not a big deal or impending failure.

He also did a very nice job putting the codes you are experiencing and concerned about in context.

I'd encourage you to enjoy your truck and not let sensitivity spook you. Mine's also a '24 PB XLT with similar miles. It's been a wonderful truck. It is really an engine and tires wrapped in apps. That makes it a very different critter than older vehicles. That means we need to learn to deal with it a little differently than older more mechanical vehicles.

 

[soup7_20]

I'd not let it be too much with you.

Electronics tend to have early failures then long stable lives. The door latch sensor seems to fit that description. That you've done 9k miles, more than twice what it had when you got it, without further failures means you're beyond that early failure peak.

Looks like Snakebitten put a pretty good finger on the groan, it's part of the HV charging cycle. Perhaps not a feature you would choose to have, but not a big deal or impending failure.

He also did a very nice job putting the codes you are experiencing and concerned about in context.

I'd encourage you to enjoy your truck and not let sensitivity spook you. Mine's also a '24 PB XLT with similar miles. It's been a wonderful truck. It is really an engine and tires wrapped in apps. That makes it a very different critter than older vehicles. That means we need to learn to deal with it a little differently than older more mechanical vehicles.

I appreciate that, thank you!

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