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P0733 Mazda Code - Third Gear Error

Quick Answer

The P0733 diagnostic trouble code (DTC) for Mazda vehicles indicates a transmission-related issue specifically concerning the third gear. Common causes include Low transmission fluid levels or dirty fluid, Faulty transmission solenoid, Worn clutch or gear in the transmission. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0733 Mazda indicates Third Gear Error.
Common causes
Common causes include Low transmission fluid levels or dirty fluid, Faulty transmission solenoid, Worn clutch or gear in the transmission.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0733 Mazda Description

The P0733 diagnostic trouble code (DTC) for Mazda vehicles indicates a transmission-related issue specifically concerning the third gear. When this code is triggered, it means that the transmission is not shifting into third gear properly or not at all. This can lead to various performance issues, including poor acceleration, decreased fuel efficiency, rough shifting, and potential transmission overheating.

OBDII Code P0733 Mazda - Third Gear Error
P0733 Mazda Code - Third Gear Error

Common Causes of P0733 Mazda

  1. Low transmission fluid levels or dirty fluid
  2. Faulty transmission solenoid
  3. Worn clutch or gear in the transmission
  4. Malfunctioning transmission valve body
  5. Electrical issues within the transmission system

Symptoms of P0733 Mazda

  1. Delayed or harsh shifting between gears
  2. Slipping or flaring of gears
  3. Engine revving without corresponding acceleration
  4. Decreased fuel efficiency
  5. Illumination of the Check Engine Light

How to Fix P0733 Mazda

  1. Begin by checking the transmission fluid level and condition. Top up or replace the fluid if necessary.
  2. Perform a thorough inspection of the transmission system, including the solenoids, clutch, and gear components.
  3. Test the transmission valve body for any malfunctions and replace if needed.
  4. Clear the DTC from the TCM memory and test drive the vehicle to verify that the issue has been resolved.
  5. If the problem persists, seek assistance from a professional mechanic or transmission specialist for further diagnosis and repair.

Cost to Fix P0733 Mazda

The typical repair costs for addressing a P0733 code in a Mazda vehicle can range from $200 to $800, depending on the specific cause of the issue and the extent of the repairs needed. This estimate includes parts and labor, with the cost of parts varying based on the component that needs to be replaced. As mentioned earlier, labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple sources before proceeding with the repair.

What does this mean?

Tech Notes for P0733 Mazda

Start by inspecting the transmission fluid level and condition, and change fluid if necessary.

When is the Code Detected?

P0733 is detected when A/T cannot be shifted to the 3rd gear position even if electrical circuit is good.

Need more information about the P0733 Mazda code?

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Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0733 Mazda Code

1. What does the OBDII code P0733 mean on a Mazda?

P0733 indicates a "Third Gear Ratio Error," meaning the transmission control module (TCM) has detected an issue with the ratio in third gear not matching expected values.

2. What are common symptoms of the P0733 code in a Mazda?

Symptoms may include difficulty shifting into third gear, slipping gears, reduced fuel efficiency, a check engine light, and poor overall transmission performance.

3. What causes the P0733 code on a Mazda?

Common causes include low or dirty transmission fluid, faulty shift solenoids, a worn or damaged transmission, or issues with the transmission control module (TCM).

4. Can low transmission fluid cause the P0733 code?

Yes, low or contaminated transmission fluid can cause improper gear ratios and trigger the P0733 code.

5. How is the P0733 code diagnosed on a Mazda?

A mechanic will check the transmission fluid level and condition, scan for additional codes, inspect shift solenoids, and test the transmission for mechanical issues.

6. Can driving with the P0733 code damage my Mazda further?

Yes, driving with this code can worsen transmission damage if the underlying issue is not addressed promptly.

7. How do you fix the P0733 code on a Mazda?

Repairs may involve replacing or repairing shift solenoids, flushing and refilling transmission fluid, reprogramming or replacing the TCM, or rebuilding the transmission if necessary.

8. How much does it cost to fix a P0733 code on a Mazda?

Repair costs vary widely, ranging from $100–$300 for fluid changes or solenoid repairs, to $2,000 or more for a transmission rebuild or replacement.

9. Can I reset the P0733 code without fixing the issue?

While the code can be cleared temporarily, the issue causing it will likely trigger the code again until repaired.

10. Is the P0733 code specific to Mazda vehicles?

No, P0733 is a generic OBDII code that can appear on any vehicle, but the diagnosis and repair may vary depending on the make and model.

Discuss the causes and fixes for P0733 Mazda OBDII Code

Submit a New Comment

  • 04 Mazda 3 sets po733 and 734 every drive cycle sets at light no engine dtcs
    Trans simply goes into neutral every time it shifts to 3rd then it looks for fourth with no engagement at all . No debris in pan .I changed fluid at first time of trouble but no help
    About 130k on vehicle

    Reply to Comment

  • Next step is to inspect the shifting solenoids
    inside the transmission, but with the amount of mileages on you Mazda, you
    should consider rebuilding the transmission.

    Reply to Comment

  • Hi

    I have 3 codes:
    P0733
    P0734
    P0762 (Shift Solenoid "C" Stuck On)

    It the P0762 the cause of the other 2 codes? Are they different problems?

    It is a 115K car (Mazda 3)

    Same symptoms as Ken Harrelson

    Reply to Comment

  • Which solenoid would control gear 3? P0733-ff (Transmission Gear #3 Incorrect Ratio)

    Reply to Comment