LB7: Trans. Codes

aaronlev03

New member
Dec 16, 2008
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Hi mike I just recently pulled the motor out of my 03 for a blown head gasket. In process a bell housing bolt got left in the tranny and an ear got broke off. I had it welded back on with the motor out and the batteries disconnected but all of the sensors in the tranny were still hooked up. I am wondering if this possibly could have fried the sensors because im getting a few codes now and the truck intermittently will not go into reverse. P0727, P0742, P0841, P1713, U1041. Also I had to replace the neutral safety switch to get the truck to communicate with the starter so it makes me think that the sensors may be bad in it now any advice would be very appreciated.

thx
 

Mike L.

Got Sheep?
Staff member
Vendor/Sponsor
Aug 12, 2006
15,681
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Fullerton CA
Check the speed sensor on the bell housing. Also chek the wires that go to that speed sensor.