Gear 3 Incorrect Ratio

Your car's computer expects a certain behavior when it shifts into third gear, but it's not seeing it. This could be due to mechanical issues or electronic problems in the transmission system.

The computer monitors the gear ratios through input and output speed sensors. It calculates the expected ratios based on engine RPM and vehicle speed. If the actual ratio for third gear doesn't match what's expected, the P0733 code sets.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 11. Check transmission fluid level and condition. Ensure it’s within the recommended range and not burnt. Decision Point: If fluid is low or burnt → Refill or replace fluid; If fluid is good, proceed to step 2.
2. 22. Inspect wiring and connectors leading to the transmission control module and speed sensors. Look for fraying or corrosion. Decision Point: If damaged → Repair or replace wiring; If good, proceed to step 3.
3. 33. Test the input/output speed sensors. Use a multimeter to verify they are producing the correct voltage and signals while the vehicle is running. Expected values are typically between 0.5V to 5V based on vehicle speed. Decision Point: If sensors are faulty → Replace sensors; If they test good, proceed to step 4.
4. 44. Check the condition of the transmission solenoids. If you have a solenoid tester, verify that they actuate correctly. Decision Point: If solenoids fail to actuate or show resistance outside 12-20 ohms → Replace solenoids; If they actuate properly, proceed to step 5.
5. 55. Inspect for internal transmission issues (worn gears, clutches). If no external problems found, consider a full transmission teardown. Decision Point: If you find wear or damage inside, it may require a rebuild or replacement.

• Low transmission fluid level
• Faulty transmission fluid temperature sensor
• Worn or damaged gears in the transmission
• Faulty shift solenoid
• Wiring issues or connector corrosion

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