Gear 3 Incorrect Ratio
What does P0733 mean?
The P0733 code means the vehicle's onboard diagnostic system has detected: Gear 3 Incorrect Ratio. This is a critical severity code.
Common Symptoms
- Check Engine Light illuminated
- Slipping in third gear
- RPM flare during 2-3 shift
- Loss of power at highway speeds
- Harsh shifting into or out of third
Probable Causes (Ranked by Likelihood)
- Worn third gear clutch pack Very High
- Faulty shift solenoid controlling third gear High
- Valve body sticking or worn Moderate
- Low transmission fluid Moderate
Step-by-Step Diagnostic Procedure
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Monitor third gear ratio with input and output speed sensors
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Check shift solenoid operation for third gear
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Perform line pressure test in third gear
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Inspect transmission fluid condition
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Transmission rebuild likely needed if clutch packs are worn
Frequently Asked Questions
Can I drive with code P0733?
Drive short distances only. An incorrect gear ratio indicates the transmission is slipping or not engaging properly. Continued driving can cause catastrophic transmission failure.
Does P0733 mean I need a new transmission?
Not always, but often. If the cause is a worn clutch pack or band, a transmission rebuild or replacement is typically necessary. If a solenoid or valve body is the cause, repair may be less extensive.
How is gear ratio measured for P0733?
The TCM compares input shaft speed to output shaft speed. The calculated ratio should match the expected gear ratio. When the ratio deviates beyond a threshold, the code is set.