P0733 is a third-gear incorrect ratio code. The computer commanded third gear, compared input speed to output speed, and saw the wrong relationship. That usually means third gear slipped, applied late, or never fully held.
Why Third Gear Matters
Third gear is used during normal acceleration and many mid-speed driving situations. It is not just a highway gear. A third-gear slip can show up on a moderate throttle pull, a merge, or a rolling acceleration after traffic clears.
What Can Cause It
The cause depends on the transmission family. A third clutch, band, direct clutch, solenoid, valve body, or pressure issue may be involved. Low fluid and overheated fluid can also expose a weak circuit that still felt acceptable when cold.
Details We Need From The Driver
- Does the RPM flare before third gear catches?
- Does the problem happen hot, cold, or both?
- Are P0732, P0734, P0700, or solenoid codes stored with it?
- Does manual gear selection change the symptom?
- Was there a recent fluid service, tow, or overheating event?
Diagnosis
We verify the code, inspect fluid condition, road-test the shift pattern, and compare commanded gear to actual ratio. If the pan is clean and the issue points to control or pressure, targeted repair may be possible. If the pan shows clutch material, the code is likely reporting internal wear.
Drive-Or-Tow Guidance
If the transmission is slipping hard through third, limit driving. Repeated slipping creates heat and debris quickly. If the vehicle still shifts normally but the light is on, bring it in before the fault becomes constant.
Have a Transmission Problem?
Get a free computer diagnostic from Arlington Heights transmission repair support.
