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F650 No crank

 
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Old 01-24-2019, 05:20 PM
dale1967dc
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F650 No crank

2018 F650 6.7 L diesel. Will not crank. Was cranking fine and it just stopped. Truck has 9000 miles on it
 
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Old 01-25-2019, 05:55 PM
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Neutral safety switch? May not think it's in park or Neutral. Try putting it in neutral and see if it cranks. Same for possible brake light switch? Do brake lights work?
 
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Old 01-26-2019, 06:00 AM
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I tried putting it in neutral and still wouldn't crank. I will check the brake lights. Truck only has 9,000 miles on it. It was cranking fine then just stopped.
 
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Old 01-26-2019, 07:33 AM
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I've been fighting this problem for months. Mine is a 2011, and I'm hoping I have it fixed now. Another guy on here, had the exact same issue, and had his PCM re-flashed and it fixed it for him. I had mine re-flashed yesterday, so we will see how well it fixed mine in the next week or so.
I did all of the physical checks, starter connections, alternator, good batteries, neutral safety switch, relays, fuses, ALL connections were good. It's been frustrating. The way mine would act, was I would have power to everything, but NO crank to the starter, I could hear the fuel pump, and all systems seemed good, except no crank...
 
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Old 01-26-2019, 07:47 AM
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Yes I checked all the preliminary stuff also. Everything is fine. This truck is under warranty but customer doesn't want to tow it to the dealer.
 
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Old 01-26-2019, 01:20 PM
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re-flash did NOT fix my no cranking issue. Back to the shop next week....
 
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Old 01-26-2019, 08:06 PM
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Originally Posted by UP_There View Post
I've been fighting this problem for months. Mine is a 2011, and I'm hoping I have it fixed now. Another guy on here, had the exact same issue, and had his PCM re-flashed and it fixed it for him. I had mine re-flashed yesterday, so we will see how well it fixed mine in the next week or so.
I did all of the physical checks, starter connections, alternator, good batteries, neutral safety switch, relays, fuses, ALL connections were good. It's been frustrating. The way mine would act, was I would have power to everything, but NO crank to the starter, I could hear the fuel pump, and all systems seemed good, except no crank...
Did you check the hood switch?
 
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Old 01-26-2019, 08:17 PM
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Is there a PTO? There is a starter inhibit shown in the body upfitter guide. The next likely cause is the firewall bulkhead connection check for moisture. It's on the drivers side and runs down and crosses the frame.
 
 


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