The P0733: Gear 3 Incorrect Ratio refers to a fault where the transmission detects an improper gear ratio while operating in third gear. This issue may stem from mechanical problems inside the transmission, malfunctioning sensors, or faulty solenoids that regulate gear shifting.
P0733 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0733: Gear 3 Incorrect Ratio |
| Is it serious? | Yes, incorrect gear ratios can cause drivability problems and lead to transmission damage if left unresolved. |
| Possible causes | – Incorrect gear ratio detected for gear 3 – Transmission mechanical issues – Faulty sensors or solenoids |
| How to diagnose? | – Inspect and test for mechanical issues in the transmission – Check gear ratio sensors and solenoids – Replace faulty components if necessary |
P0733 Meaning
The P0733 code indicates that the transmission control module (TCM) has detected an incorrect gear ratio while the vehicle is in third gear. This may be caused by mechanical issues within the transmission, malfunctioning sensors, or defective solenoids responsible for controlling the gear shifts.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check if additional transmission-related codes are present. Other codes may provide more insight into the issue. | OBD-II Scanner |
| Inspect Transmission Components | Check the transmission for mechanical issues such as worn gears, broken bands, or internal damage that could be affecting gear ratios. | Transmission Tools, Flashlight |
| Test Gear Ratio Sensors | Test the gear ratio sensors using a diagnostic scanner to ensure they are functioning within the manufacturer’s specifications. | Multimeter, Diagnostic Scanner |
| Check Solenoids | Inspect the transmission solenoids that control gear shifting to ensure they are working properly. Replace any faulty solenoids as needed. | Multimeter, Solenoid Tester |
| Inspect Transmission Fluid | Check the transmission fluid level and quality. Contaminated or low fluid can cause gear ratio problems. | Transmission Fluid Tester, Dipstick |
| Replace Faulty Components | Replace any damaged sensors, solenoids, or internal transmission components that are affecting the gear ratios. | Replacement Parts, Wrenches, Screwdrivers |
| Clear the Code and Test Drive | After repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved. | OBD-II Scanner |
| Recheck for Codes | After the test drive, rescan the vehicle to ensure that the P0733 code has not reappeared. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko