P0784
PowertrainTransmission Shiftmoderate severity4-5 Shift Malfunction
What P0784 Means
The transmission did not complete the shift from 4th to 5th gear properly. This is typically caused by a solenoid or hydraulic problem in the shift circuit.
Symptoms
- No 4-5 upshift
- Slipping in higher gears
- Poor fuel economy
Common Causes
- Faulty shift solenoid
- Low or contaminated transmission fluid
- Worn valve body
- Internal mechanical failure
Diagnostic Steps
- Check fluid level and quality
- Retrieve all transmission trouble codes
- Test the shift solenoid circuit
- Inspect valve body for sticking valves
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