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2024 Flash - First Service at 8,000 miles (Powertrain Malfunction - Power Reduced) (FIXED-#6)

kubel

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*UPDATE: "Powertrain Malfunction - Power Reduced" fault was resolved by replacing the shifter assembly. It was not a problem with the actual powertrain.

Ford should do what Tesla used to do and use a momentary shifter. Then all commanded positions appear on the display instead of showing them on a legacy physical indicator, thus eliminating the need for an actual self-moving kerchunky shifter for autonomous features. Ford's engineering culture is "lets electrify the way we always did things" and Tesla's is "let's engineer from first principles". A self-moving phsical shifter that isn't even connected to a transmission is an absurd engineering decision. */UPDATE*

I had three occurances of a "Powertrain Malfunction - Power Reduced" fault with "Service Vehicle Soon" wrench indicator show on the dash. After a few hours, it goes away as if nothing happened. Started two weeks ago. So I decided to schedule service and get a list of items taken care of:

  1. Powertrain Malfunction - Power Reduced (3x). P0929, GSM (gear lock selenoid actuator).
  2. Wobble in rear end, goes away immediately when sport mode is activated. My understanding is F-150 uses CCD (continuously controlled daming), so my guess is there's a rear wheel imbalanced and sport mode is somehow tuning out the wobble when it switches the CCD mode of the rear suspension? Otherwise, it's powertrain related.
  3. Film from factory left behind the steering wheel cover not completely removed at delivery. I'm having them remove it since it will require popping off the airbag cover.
  4. Momentary switch on the drivers window occasionally doesn't go up.
  5. Tire rotation, it's that time. Normally do these with the season change since I use snow tires but didn't get them for the truck yet.

No loaners so back to driving the Tesla. If it's in the shop over a week I'll reach out to Fords electric team and see if they can do something.

This is my first truck and I love the versatility of the Lightning. I don't know how I made it all these years driving little cars. But now that I've experienced all that it can do (I really put it to work), I'm going to miss it while it's in for service.

Initially I just liked it because it was comfortable big tall vehicle with a quiet interior and smooth suspension- but I was disappointed with the software as it is its biggest weakness. But each new thing I'm discovering I can do with it makes me like this truck even more.

Ford F-150 Lightning 2024 Flash - First Service at 8,000 miles (Powertrain Malfunction - Power Reduced) (FIXED-#6) IMG_20250421_211928
Ford F-150 Lightning 2024 Flash - First Service at 8,000 miles (Powertrain Malfunction - Power Reduced) (FIXED-#6) IMG_20250426_151118
Ford F-150 Lightning 2024 Flash - First Service at 8,000 miles (Powertrain Malfunction - Power Reduced) (FIXED-#6) photo_2024-10-29_19-16-56
Ford F-150 Lightning 2024 Flash - First Service at 8,000 miles (Powertrain Malfunction - Power Reduced) (FIXED-#6) photo_2024-11-03_23-12-03
Ford F-150 Lightning 2024 Flash - First Service at 8,000 miles (Powertrain Malfunction - Power Reduced) (FIXED-#6) photo_2025-01-25_14-23-59 - Copy
Ford F-150 Lightning 2024 Flash - First Service at 8,000 miles (Powertrain Malfunction - Power Reduced) (FIXED-#6) IMG_20250501_153459
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SunPowered

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This week picking up a new Lightning, to take on the role of my "old faithful" Toyota Tundra. Which is going away after decades of near perfect service. Difficult change, but it is time to move into the future and forego the perpetual gas suck and burning of stuff for power.. (Aiming to partially power with my own panels.). Please keep us abreast of progress on the technical kinks. I know the road forward for me will not be bump free, but hopefully the bugs will be minor and fixable. Wishing the same for you.
 
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kubel

kubel

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Based on my research here, it looks like there are two common causes of this error:

1. "Powertrain Malfunction - Power Reduced" + actually reduced power: This is usually a bad battery module, where an implausible or unstable voltage is detected.
2. "Powertrain Malfunction - Power Reduced" but no actual power reduced, no symptoms, and eventually goes away: Problem with shifter. Throws a P0929.

The GSM did show an indicator illuminated DTC but I ignored it since I didn't think it was part of the powertrain.
 

Shaw1984

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Hi, I have the exact same issues on my 2024 Flash. What ended up being the remedy?
 

TaxmanHog

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kubel

kubel

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Truck is back. The cause was apparently P0929, a fault with the shifter where it detects it's not being put into the commanded position. It throws a powertrain failure for some reason. There wasn't actually a problem with the powertrain. Their fix was to replace the entire shifter assembly (under warranty).

My understanding is if you see that power is reduced with this error, and it doesn't go away, it's likely a battery module issue. But if you don't get any symptoms and it intermittently goes away, it's probably the shifter. Pull the codes to know for sure.

The other issues were taken care of. The wobble in the back went away when they rotated and balanced the tires. The window switch was replaced and that fixed the intermitten window issue. And they removed the film from the steering wheel airbag cover.
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