P0783
3-4 Shift
Transmission — shift control
Generic OBD-II
Medium
What it means
P0783 means the transmission did not complete the 3-4 gear change correctly. It usually points to the shift solenoid or hydraulic circuit for that shift, low line pressure, or internal wear. The engine still starts and lower gears normally work, but the 3-4 shift may be harsh, delayed, or missed until it is fixed.
Medium
Can I keep driving? The car still drives, but the 3-4 shift may be harsh or missed and the transmission can drop into limp mode — get it checked before long trips.
Common symptoms
What you'll notice
- Check-engine light on
- Harsh, delayed, or erratic 3-4 shift
- Transmission slips or will not reach 4th
- Higher RPM where 4th should engage
- Reduced fuel economy
Common causes
Most likely first
- Faulty 3-4 shift solenoidLikely
- Low or contaminated transmission fluidCommon
- Valve body wear or sticking affecting the 3-4 circuitCommon
- Worn clutches or internal mechanical wearLess often
- Failed transmission control module (TCM) — least commonLess often
How to diagnose & fix
Work through it in order
- Check fluid level and condition first.
- Confirm the code and read freeze-frame data.
- Inspect and test the shift solenoid(s) for the 3-4 circuit.
- Inspect the valve body if the solenoids test good.
- If mechanical, have the transmission internals inspected. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0783?+
Short trips are usually okay, but a slipping or missed 3-4 shift stresses the transmission — repair it soon.
Can I just clear P0783?+
It returns until the solenoid, fluid, or mechanical fault behind the 3-4 shift is repaired.
Related codes
Often seen with P0783
Read & clear P0783 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