P0733 – OBD-II DTC

OBD-II DTC P0733 – Gear 2 Incorrect ratio

DTC P0733 meaning

DTC P0733 indicates that the transmission control module (TCM) has detected an incorrect gear ratio in the second gear of the automatic transmission. This means that the actual gear ratio does not match the expected ratio, which can lead to poor vehicle performance and drivability issues.

DTC P0733 symptoms

Common symptoms associated with DTC P0733 may include:

• Slipping transmission
• Delayed or harsh shifting
• Check Engine Light illuminated
• Reduced acceleration
• Unusual noises from the transmission

DTC P0733 causes

Several factors can contribute to the occurrence of DTC P0733, including:

• Low transmission fluid level
• Contaminated or degraded transmission fluid
• Faulty transmission solenoids
• Worn or damaged gears
• Malfunctioning TCM
• Issues with the vehicle’s speed sensors

DTC P0733 seriousness

DTC P0733 is considered a serious issue as it can affect the vehicle’s drivability and safety. If left unaddressed, it may lead to further transmission damage, increased repair costs, and potential breakdowns. It is advisable to diagnose and repair the issue promptly.

How to diagnose DTC P0733

To diagnose DTC P0733, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC P0733.
2. Check for any additional DTCs that may provide more context.
3. Inspect the transmission fluid level and condition.
4. Examine the transmission wiring and connectors for damage or corrosion.
5. Test the transmission solenoids for proper operation.
6. Check the vehicle’s speed sensors for functionality.
7. Perform a road test to observe shifting behavior and performance.

How to fix DTC P0733 step-by-step instructions

To fix DTC P0733, follow these steps:

1. Check and top off the transmission fluid if low.
2. Replace contaminated or degraded transmission fluid.
3. Inspect and replace faulty transmission solenoids as needed.
4. Repair or replace damaged wiring and connectors.
5. Test and replace malfunctioning speed sensors.
6. If necessary, rebuild or replace the transmission if internal damage is found.
7. Clear the DTC using an OBD-II scanner and perform a road test to ensure the issue is resolved.

How to erase DTC P0733

To erase DTC P0733, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Access the DTC menu on the scanner.
4. Select the option to clear or erase the DTCs.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the vehicle to check if the DTC reappears.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.