6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

Electronic shift on the fly

Old 05-01-2019, 08:14 PM
Brian Emory
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Electronic shift on the fly

Intermittent PITA. When the 4 wheel drive has not been used in an extended period of time it engages perfectly minus the fact that my auto hubs do not work so they just get manually engaged. However after it has been engaged and disengaged multiple times it will no longer activate unless the battery is disconnected and then it will only work until the key is turned off and back on and then it will no longer activate. Repeat the process of unhooking and reconnecting the battery and once again it works for the first key cycle. When the system is not working there is no power to the switch or selector motor. I have replaced all the fuses, even though none where blown, and replaced the relays. Please help.
Old 05-02-2019, 07:28 PM
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Can you read the codes from the 4x4 module?
Does your tow/haul button work even when the 4x4 does not? It is in the same circuit as the shift on the fly solenoid and the vacuum pump.
Old 05-11-2019, 02:58 AM
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Auto Locking Hubs

Have you checked your vacuum hoses that runs to your front hubs to see if they're cracked,torn or disconnected?
The Auto feature requires vacuum.
Old 05-11-2019, 03:13 AM
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Crawl underneath and look at the wiring going into the transfer case/4wd shift motor - make sure itís not chafed and not loose or dirty.

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