P0733 Code: Gear 3 Incorrect Ratio

The P0733 code, also known as "Gear 3 Incorrect Ratio," is a common diagnostic trouble code in automatic transmission vehicles. It affects models like the Ford F-150, Toyota Camry, and Chevrolet Silverado, indicating a gear ratio error. This guide covers the causes, symptoms, and solutions for this transmission failure, with tips on using tools like the iCarsoft CR MAX. For related issues, explore our articles on P0732 and P0734.

1. What Is a P0733 Gear Ratio Issue?

2. Causes of a P0733 Transmission Error

Several factors can lead to a gear ratio error in vehicles:

• Low Transmission Fluid: Insufficient or dirty transmission fluid can cause improper gear engagement, often seen in a P0733 code.
• Faulty Shift Solenoids: Malfunctioning shift solenoids can prevent the transmission from engaging third gear properly.
• Worn Transmission Gears: Over time, third gear components may wear out, leading to a transmission failure.
• Transmission Sensor Issues: A faulty transmission speed sensor can send incorrect data to the ECU, triggering the code.
• ECU Software Issues: An outdated or glitchy ECU software can misinterpret gear ratios.

3. Symptoms of a P0733 Code

A P0733 code can manifest through several symptoms:

• Check Engine Light: The most noticeable sign is a glowing check engine light on the dashboard.
• Harsh or Delayed Shifting: You may experience rough or delayed shifts, especially when moving into third gear.
• Slipping Transmission: The transmission may slip, causing a loss of power during acceleration.
• Reduced Fuel Efficiency: Improper gear engagement can lead to higher fuel consumption.
• Limp Mode: The vehicle may enter limp mode, limiting speed to protect the transmission.

In a Toyota Camry with a P0733 code, you might notice harsh shifting, while a Chevrolet Silverado may exhibit slipping.

4. Hazards of a P0733 Transmission Issue

Driving with this issue poses several risks:

• Transmission Damage: Continued driving can lead to severe transmission failure, requiring a costly rebuild.
• Safety Risks: Slipping gears or limp mode can make the vehicle unpredictable, especially at high speeds.
• Increased Repair Costs: Ignoring the issue may damage related components like the torque converter.

5. Can You Drive with a P0733 Code?

You can drive with a P0733 code if symptoms are mild (e.g., just a check engine light), but avoid long-term driving. Severe symptoms like slipping in a Ford F-150 suggest towing to prevent further damage.

6. Will a P0733 Code Clear Itself?

The P0733 code typically won’t clear itself. The ECU stores the code until the issue is fixed and reset using a diagnostic tool like the iCarsoft CR MAX.

7. Solutions for a P0733 Gear Error

Here are the most effective solutions:

• Check and Replace Transmission Fluid: Ensure the fluid level is correct and replace if dirty.
• Replace Shift Solenoids: Faulty shift solenoids often cause issues in a P0733 code.
• Inspect Transmission Sensors: Replace any faulty transmission speed sensor.
• Update ECU Software: A software update may resolve misinterpretations of gear ratios.
• Transmission Rebuild: In severe cases, a rebuild may be necessary to fix worn gears.

8. Diagnosing a P0733 with a Tool

The iCarsoft CR MAX can help diagnose this issue:

1. Connect the tool to the OBD-II port under the dashboard.
2. Turn on the ignition and the tool, then select your vehicle model.
3. Read the diagnostic trouble code and freeze-frame data. For example, if the input and output speeds differ by more than 10% in third gear, it confirms a gear ratio error.
4. Inspect the transmission fluid and sensors. If unsure, consult a mechanic.

In a Dodge, high transmission temperature in the data may indicate fluid issues.

Learn More about iCarsoft CR MAX

9. Other Uses of CR MAX in Diagnosis

The iCarsoft CR MAX is a multi-brand diagnostic tool. Beyond diagnosing a P0733, it can read codes, access live data, and perform component tests for brands like Toyota, Ford, and Chevrolet, covering systems like the engine, ABS, and airbags.

10. Repair Video Tutorial for P0733

Search YouTube for “P0733 code repair” to find step-by-step videos. These tutorials often show how to diagnose and fix the issue in models like the Toyota Camry.11. Differences Across Vehicle Model Years

The P0733 code varies across model years:

• Older Models (2000-2010): Vehicles like the 2005 Ford F-150 often face transmission failure due to worn shift solenoids, with repair data showing a 65% failure rate in this range.
• Newer Models (2015-2020): Models like the 2018 Toyota Camry have more advanced transmission systems, often triggering the code due to sensor issues.

Note: Models like the Ford F-150, Toyota Camry, Chevrolet Silverado, and Honda Accord are prone to this issue due to factors like low fluid or worn gears.

12. Preventing P0733 Transmission Issues

To prevent future transmission failure issues:

• Follow the manufacturer’s maintenance schedule, checking transmission fluid every 30,000 miles.
• Use high-quality transmission fluid to avoid contamination.
• Address rough shifting or slipping promptly to protect the transmission.

13. Common Questions About P0733

Can Low Fluid Cause a P0733 Code?
Yes, low or dirty transmission fluid can prevent proper gear engagement, often triggering a P0733 code.

Can I Fix This Issue Myself?
Yes, if you have basic skills. Checking fluid levels or replacing a transmission speed sensor is manageable, but a rebuild may require professional help.

Learn More about iCarsoft CR MAX

Other related error code blog posts:
P0732 Code: The Only Guide You Need