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Quoted From dreamer2355:
Ugh, i just posted a huge reply but there was an error with the website so ill try again……
What was the exact code when the CEL came on?
If you know the location of the particular shift solenoid at fault, you can disconnect it from its harness and check the solenoid by completing a continuity test and cross referencing those results against factory specs if possible.
If you have access to a bi-directional scantool, they have the ability to activate shift solenoids to help in the aid of diagnosing shift solenoid issues.
I would start myself by checking the integrity of the circuit for the shift solenoid which has the current fault with the use of wiring diagrams and making sure you have good power and grounds.
You also have the option too of putting 12v’s to the shift solenoid and listening for a mechanical action. Again, i would do this unplugged from the rest of the circuit.
Hope this helps.
The continuity all of the solenoids have been tested. Would a blown solenoid be the cause of no third gear? Another Mechanic said it was the transmission as well