Truck shutting off.... - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 11-23-2019, 06:08 AM Thread Starter
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Truck shutting off....

So Iíll give you a brief rundown, over the past 2 months my truck has shut off 3 times, each time driving 45-55 mph. Truck would seem to go into a limp mode for a few seconds then completely shut off. After sitting for 5 or so minutes truck will restart and drive like nothing happened.

- First time it happened truck gave a ďspeed sensorĒ code, mechanic replaced sensor on rear differential which seemed to fix the problem. Few days prior my abs / Traction control lights came on briefly and my speedometer was fluctuating also

- Drove the truck problem free for several weeks when the truck shut off again. I called my mechanic and told him I was dropping it off the following day. The truck shut off again on my way there.

- When I dropped the truck off the second time it didnít throw any codes and my mechanic has been driving it for 2 weeks and canít get the issue to reappear.


At this point heís unsure of whatís causing this problem. He mentioned it could possibly be my tuning? If anybody has ever experienced this problem or has advice on possible causes Iíd appreciate any help? Thanks

2009 F350 4x4
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post #2 of 2 Old 11-23-2019, 08:46 AM
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The speed sensor should have nothing todo with the engine running -- that said, you should look at the harness by the rear axle for worn spots -- possible the "hot" side of the sensor is shorting and causing the issue -- many of the sensors share a common voltage source from the pcm

Possibly getting the truck in the right twist is what is needed, and your driver is not doing the same things as you

Intermittent electrical problems are the hardest to figure out for sure

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