06 6.0 5r110 won't shift

7.3powerstroke00

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Ok I'm the second shop to have this truck. Truck was initially taken to the first shop for "starter problem"..... 5 starters later they decide it needs a flex plate..... They Install a new flex plate and starter #6, then decide it needs a new engine..... This is when the customer had it towed to me. I notice no coolant in res, she states they been adding coolant. I pressurize the system to check for external leaks, nothing. Drain radiator and it's pure water, check oil it's milky. So I pull drain plug and way more water than oil comes out....

Engine won't turn over by hand, it's locked up. So we pull injectors out and try it again, now I'm using a 58" pry bar and still locked up. So we install a used engine. Take it for a drive and it won't shift out of first on its own. Shift it manually it works, use snap on scanner to command shifts it works. No codes, no input, shaft speed, no turbine speed, no intermediate shaft speed.....

Truck was shifting fine before first shop got it and if course they are pushing the blame elsewhere.....

Sorry for the long post just wanted to get all the info.

Any ideas?

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Mark Kovalsky

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I think there is a damaged wiring harness. Try checking the continuity of the speed sensor wiring to the PCM. It could also be a bad PCM. I'd expect it to set codes if the wiring was damaged. The electrical tests are the most robust tests the PCM runs.
 

7.3powerstroke00

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I myself got under the truck today and checked power and ground to the main harness. Then I checked the 2 sensor plugs on the top of the trans, and what do you know they weren't plugged in all the way.... Shifts great when it can read shaft speeds....lol

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