P0784
4-5 Shift
Transmission
Generic OBD-II
Medium
What it means
P0784 means the transmission control module detected a problem completing the shift between 4th and 5th gears — the change is slow, harsh, or doesn't happen cleanly. It usually points to the 4-5 shift solenoid, low or wrong fluid pressure, or worn clutches for that shift. It won't cause a no-start; the car still drives, but shifting around those gears will be rough until it's repaired.
Medium
Can I keep driving? You can drive, but expect harsh or erratic shifts around the 4th-to-5th change and possibly a held gear — have it checked before it worsens.
Common symptoms
What you'll notice
- Erratic or inconsistent shifting between 4th and 5th gears
- Harsh or delayed 4-5 shift
- Failure to fully engage 4th or 5th gear
- Reduced fuel economy
- Check-engine light on
Common causes
Most likely first
- Faulty 4-5 shift solenoidLikely
- Low or contaminated transmission fluidCommon
- Valve body fault affecting the 4-5 applyCommon
- Worn clutches or friction elements used for the 4-5 shiftLess often
- Transmission control module (TCM) faultLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and scan for related solenoid or ratio codes.
- Check transmission fluid level and condition; service if degraded.
- Test the 4-5 shift solenoid electrically and mechanically.
- Inspect the valve body for sticking valves or debris.
- If the apply clutches are worn, internal repair is needed. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0784?+
For short trips, yes. The main risk is rough or missed shifts around 4th and 5th. Sustained harsh shifting adds wear, so fix it before it gets worse.
Can I just clear P0784?+
It returns the next time the 4-5 shift misbehaves. The solenoid, fluid, or valve-body cause has to be repaired.
Related codes
Often seen with P0784
Read & clear P0784 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX