Question

Fault codes P0753 and U1026 are showing on my 2000 Chevrolet Tahoe 5.3L 4x4. What do they mean and how do I fix it?

Answer 1

 

P0753 - Shift Solenoid A Electrical

check the highlighted ones first

 

Possible causes

- Faulty shift solenoid A valve 
- Shift solenoid A valve harness or connectors 
- Shift solenoid A valve circuit is open or shorted 
- Low transmission fluid level 
- Dirty transmission fluid 

U1026 - Loss of ATC Class 2 Communication

it means there loss of communication between computers, if you discounted something that might have caused it. You can reset it and see if it comes back.