tach not working,trans strats off in high gear,check gauges lite weak and flashing,whats wrong?
bad trans or mabey sensor.
Sounds like a solenoid in the trans, or perhaps the output speed sensor. You'll need a mechanic to diagnose this. The check engine light flashing means it is a more serious problem than just an emissions related issue.
Did you figure out what it was? Mine is doing the exact same thing and mechanic is stumped! PLEASE Help!!!
Looking for a Used Tahoe in your area?
CarGurus has 31,949 nationwide Tahoe listings starting at $1,495.
Search Chevrolet Tahoe Questions
Chevrolet Tahoe Experts