P0733
Gear 3 Incorrect Ratio
Transmission gear ratio
Generic OBD-II
High
What it means
P0733 means the transmission control module detected an incorrect ratio between input and output speed in 3rd gear — the gear is slipping instead of holding. Common causes are low or worn-out fluid, a faulty shift solenoid, or worn internal clutches, and continued driving risks overheating and progressive transmission damage.
High
Can I keep driving? Drive as little as possible — an incorrect 3rd-gear ratio means the transmission is slipping, which generates heat and can escalate to serious damage.
Common symptoms
What you'll notice
- Slipping or flaring in 3rd gear
- Harsh or delayed shifts
- Poor acceleration
- Transmission overheating
- Check-engine light on
Common causes
Most likely first
- Low or degraded transmission fluidLikely
- Worn or damaged internal components (clutches/bands)Common
- Contaminated fluid or a clogged filterCommon
- Faulty or stuck shift solenoidLess often
- Faulty transmission control moduleLess often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame, noting any companion transmission codes.
- Check the transmission fluid level, color, and smell first.
- Replace the fluid and filter if contaminated.
- Test the shift solenoids and line pressure per service data.
- Inspect for internal wear if fluid and solenoids are good; repair or overhaul as needed.
FAQ
Quick answers
Is it safe to drive with P0733?+
No — slipping in gear overheats the transmission and accelerates wear. Keep driving to a minimum until repaired.
Can I just clear P0733?+
It returns fast while 3rd gear keeps slipping; the fluid, solenoid, or mechanical cause must be corrected.
Related codes
Often seen with P0733
Read & clear P0733 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