The causes of a P0734 trouble code include a faulty PCM, ECM, or TCM; blockage inside the transmission; a faulty shift solenoid, dirty or contaminated transmission fluid, or a low transmission fluid condition, and a mechanical transmission failure.

What Repairs Will Fix P0734?

1. Change transmission fluid / filter.
2. Repair or replace damaged wiring and/or connectors.
3. Repair or replace failed transmission or torque convertor component.

How to Fix

1. Check all electrical connections and wires that connects the sensors to the transmission control module.
2. Repair or replace damaged or corroded wires in and around the transmission control module.

Repairs that can fix a P0733 code would include:

1. Replacing a shift solenoid.
2. Replacing the powertrain control module.
3. Replacing the transmission module (if applicable)
4. Adding or replacing the transmission fluid and filter.
5. Overhauling the current transmission.
6. Installing a brand new transmission.

Error Code P0734 is described as Gear 4 Incorrect Ratio. This refers to a problem in the fourth gear of the automatic transmission, usually caused by dirty or not enough transmission fluid or issues with the solenoid.

The incorrect gear ratio code may have several causes: Bad or dirty fluid in the transmission. Broken mechanical components within transmission. Internal blockage in fluid lines.

You may drive your vehicle with a P0730 however keep in mind your vehicle will not pass a smog inspection. Problems with the incorrect gear selection may cause drive-ability symptoms. The check engine light or malfunction indicator lamp will be illuminated as long as a P0730 is recorded in the ECC.

Error Code P0733 is described as Gear 3 Incorrect Ratio. This refers to a problem in the third gear of the automatic transmission, usually caused by dirty or not enough transmission fluid or issues in the solenoid.

Problems with the incorrect gear selection may cause drive-ability symptoms. The check engine light or malfunction indicator lamp will be illuminated as long as a P0730 is recorded in the ECC.

Possible resolutions include:

1. TCM replacement.
2. Replacing faulty wiring.
3. Valve body replacement.
4. Shift solenoid repair or replacement.
5. Replace transmission fluid.

Check the Level With the engine warmed up, leave the car idling in park on a level surface. Pull out the dipstick, wipe it clean, replace it slowly, and then pull it back out. Check the fluid level—how high the fluid comes up on the dipstick—against the “full” and “low” or “fill” marks on the dipstick.

The code P0734 is one of the many OBD-II codes related to this issue. If your scan tool reads this code, it pays to know what it means and how to address it. Below is an informative guide to help you understand code P0734 better. What Does the P0734 Code Mean? Diagnostic trouble code (DTC) P0734 stands for “Gear 4 Incorrect Ratio.”

A common symptom of the P0734 code is the inability to shift into the fourth gear. If this happens, it’s best to consult a repair manual for troubleshooting options or go to a certified professional for repairs. Just like any other diagnostic trouble code, there is no one fix for P0734 that can work for all makes and models.

This error code often indicates that your transmission is slipping. It usually happens when your vehicle is shifting to 4th gear or even when driving at steady speeds Automatic transmissions use multiple gear ratios to manipulate engine output.