Error Code P0729: What It Means & What To Do?

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This trouble code can start appearing in the vehicles with an automatic transmission when there is an issue shifting into 6th gear, or while driving in 6th gear. The automatic transmission is controlled by the computer using multiple gear ratios to increase vehicle speed while maximizing the power output from the engine. There can be more than four gear ratios in the latest vehicles to enhance the overall fuel economy.

Want to learn something more about this fault code?

The error code P0729 can be defined as Gear 6 Incorrect Ratio. This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model.

What causes this problem with the Gear 6 Incorrect Ratio?

• Defects in the transmission control module
• The transmission fluid might be low or dirty
• The transmission main control might have internal blockage
• Malfunctioning shift solenoid
• There can be a mechanical failure inside transmission

1. Turbocharger - OBD Code P0729 can appear because of faulty Turbocharger.
2. Engine Control Module - There can be some issues with the Engine Control Module due to which you may see P0729 code appearing over and over again. Visit us to buy best quality Engine Control Module online.
3. Engine Wiring Connectors - Are you facing some faults in your Engine Wiring Connectors? Don’t worry and get them replaced or else P0729 code can turn up.
4. EGR Valve Gasket - Common cause behind this P0729 error code can be some fault in t EGR Valve Gasket. So, it will be a good decision to replace them now.
5. Oil Pressure Sender - EGR Valve Gasket is perfectly fine but still but having that trouble code P0729 flashing? In such a situation your Oil Pressure Sender might be faulty. Why don’t you think of getting that replaced?
6. Automatic Transmission Sensor - The P0729 code can also arise due to some issues in Automatic Transmission Sensor. So, it is advised to replace them as soon as possible.
7. Powertrain Control Module - P0729 code does not really end up spoiling your Engine Wiring Connectors, but it might also accompany few powertrain control module issues. We have best powertrain related parts with us.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0729 here:

Common Symptoms

• Check engine light can start appearing
• Slow shift or not shifting into 6th gear
• Transmission might start slipping
• Diminishing fuel economy

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• The faulty transmission fluid / filter should be replaced
• You can always repair or replace the defective wiring and/or connectors
• Make sure to repair or replace quirky transmission or torque convertor components

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Here are some steps which you should follow in order to diagnose this fault code:

• The first thing which you should do before you start proceeding with the diagnosis is to inspect the fluid level as well as condition. Improper fluid level or dirty fluid can may cause shifting issues that affect multiple gears.
• If only one incorrect ratio code is being displayed, you must test drive the vehicle to determine if the gear is actually working.
• The transmission internal clutches and bands are usually controlled by a solenoid or using fluid pressure. If there is an electrical issue with a shift solenoid, a code specific to that fault should also be displayed.
• Correct the electrical issue before proceeding further. Blocked fluid passage inside the transmission can also cause the vehicle to not shift into 6th gear, if there are multiple incorrect ratio codes but the transmission performs as expected, there could be a mechanical issue with the torque converter, transmission main control, or pressure problems.
• If there are multiple incorrect ratio codes and shift issues, but not all are displayed the fault may be a mechanical issue internal to the transmission, or a fluid pressure / blocked passage in the main control.
• A shift solenoid that controls multiple gears can also be at fault if there is an internal blockage or fluid pressure problem. If there is an electrical problem with the solenoid that controls the gears, a code should be displayed specific to the solenoid at fault.
• It may be necessary to use an advanced diagnostics scan tool to determine which gear is being commanded by the transmission, and to determine if the engine speed matches with the calculated output speed from the transmission sensor.
• Advanced knowledge of transmission operation and overhaul is often required to repair this type of malfunction. Consult the factory service manual for vehicle specific diagnostic procedures.

Common Mistakes When Diagnosing The P0729 Code

• Transmission control module might have some faults
• There can be low transmission fluid level
• Issues related to wiring
• Defects in the internal transmission
• Inoperative powertrain control module
• Transmission valve body failure