Holds first o/d flashes

[Seabass]

Help! Trans holds first till redline. over drive light flashes after driving it a bit. cheapy scan tool said no codes?? Big trip planned this friday whats going on?

 

[Seabass]

oh the important stuff 01 4x4

 

[DaveBen]

Cheap scanners may not show codes for our diesel trucks. You need a scanner that will communicate in CAN communications along with the standard OBD II.

Dave

 

[Seabass]

Just tried pulling codes with a friends otc scan tool still no codes. Any one seen this before?

 

[trackspeeder]

It should have a code or many codes.
Most likely it's a stuck valve or a bad solenoid in the tranny.