OBD-II Generic Error Code P0733: How to Fix It

Medium 2-4 hours High Severity Verified July 2026
Error Code
P0733
Brand
OBD-II Generic
Product Type
automotive
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
2-4 hours
Error code P0733 indicates your vehicle's transmission is experiencing an incorrect gear ratio in third gear. This means the transmission control module has detected that the actual gear ratio doesn't match the expected ratio for third gear, which can cause poor shifting, reduced fuel economy, and potential transmission damage if left unaddressed.
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Tools You'll Need

How to Fix Error Code P0733

  1. Connect OBD-II Scanner and Record Codes

    Never attempt repairs while the engine is running or the vehicle is in motion.
  2. Check Transmission Fluid Level and Condition

    Engine and transmission will be hot - allow cooling time or use protective gloves to prevent burns.
  3. Inspect Wiring Harnesses and Connectors

    Disconnect the battery negative terminal before handling any electrical connections.
  4. Test Transmission Solenoids

    Ensure the transmission is cool and properly supported before removing the pan.
  5. Perform Transmission Fluid and Filter Change

    Dispose of used transmission fluid and filter at an approved recycling center.
  6. Clear Codes and Test Drive

    If harsh shifting, slipping, or other transmission problems occur during test drive, stop immediately and seek professional diagnosis.

Parts You May Need

Transmission fluid
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Transmission filter
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Transmission pan gasket
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Shift solenoids
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Transmission fluid
Check Price on Amazon
Transmission filter
Check Price on Amazon
Transmission pan gasket
Check Price on Amazon
Shift solenoids
Check Price on Amazon
Transmission fluid
Check Price on Amazon
Transmission filter
Check Price on Amazon
Transmission pan gasket
Check Price on Amazon
Shift solenoids
Check Price on Amazon
Transmission fluid
Check Price on Amazon
Transmission filter
Check Price on Amazon
Transmission pan gasket
Check Price on Amazon
Shift solenoids
Check Price on Amazon
Transmission fluid
Check Price on Amazon
Transmission filter
Check Price on Amazon
Transmission pan gasket
Check Price on Amazon
Shift solenoids
Check Price on Amazon
Transmission fluid
Check Price on Amazon
Transmission filter
Check Price on Amazon
Transmission pan gasket
Check Price on Amazon
Shift solenoids
Check Price on Amazon
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When to Call a Professional

Call a qualified transmission specialist if the P0733 code returns after completing these steps, if you discover burnt transmission fluid, if internal transmission components like clutches or bands need replacement, or if you're not comfortable working with transmission components. Internal transmission repairs require specialized tools and expertise.

Frequently Asked Questions

What does P0733 error code mean?
P0733 indicates that the transmission control module has detected an incorrect gear ratio in third gear. The actual ratio doesn't match what the computer expects, suggesting a problem with transmission components, fluid, or electronic controls.
Can I drive with P0733 code?
You can drive short distances with caution, but continued driving with P0733 can cause severe transmission damage. The transmission may slip, shift harshly, or fail to engage third gear properly, leading to costly repairs.
What causes P0733 transmission error?
Common causes include low or contaminated transmission fluid, faulty shift solenoids, worn clutch bands or friction plates, blocked transmission filter, damaged valve body, or wiring issues in the transmission control system.
How much does it cost to fix P0733?
Repair costs range from $150-300 for fluid and filter changes or solenoid replacement, up to $2000-4000 for internal transmission rebuilds. The actual cost depends on the root cause and extent of damage.
Will P0733 cause transmission failure?
If left unaddressed, P0733 can lead to complete transmission failure. The incorrect gear ratio puts stress on internal components and can cause clutch burning, band failure, or complete loss of gear engagement.