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.

Real-world scan data

Seen in

309

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P0733 scans

P0732in 71.8% of scans

P0731in 65.7% of scans

P0734in 56.0% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P0733 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX