AutoCodes – Dodge – P0729 Dodge

P0729 Dodge Code - Automatic Transmission 6th Gear Incorrect Ratio

Quick Answer

This malfunction is detected when the A/T does not shift into 6GR position as instructed by TCM. Common causes include Low transmission fluid level, Shift solenoid mechanical fault, Hydraulic circuit fault. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0729 Dodge indicates Automatic Transmission 6th Gear Incorrect Ratio.
Common causes: Common causes include Low transmission fluid level, Shift solenoid mechanical fault, Hydraulic circuit fault.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 21,681

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0729 Dodge Description

This malfunction is detected when the A/T does not shift into 6GR position as instructed by TCM. This is not only caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such as control valve sticking, improper solenoid valve operation, etc.

OBDII Code P0729 Dodge - Automatic Transmission 6th Gear Incorrect Ratio - AutoCodes.com — P0729 Dodge Code - Automatic Transmission 6th Gear Incorrect Ratio

What does this mean?

What are the Possible Causes of the DTC P0729 Dodge?

Low transmission fluid level
Shift solenoid mechanical fault
Hydraulic circuit fault
Transmission failure

How to Fix the DTC P0729 Dodge?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0729 Dodge code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0729 Dodge Code

1. What are the common symptoms of OBDII code P0729 in a Dodge with automatic transmission?

The common symptoms of code P0729 include harsh shifting, hesitation when accelerating, and illuminated warning lights on the dashboard.

2. What causes the OBDII code P0729 to trigger in a Dodge vehicle?

The code P0729 is triggered when the Engine Control Module (ECM) detects that the gear ratio of the 6th gear in the automatic transmission does not match the expected ratio.

3. How serious is the OBDII code P0729 in a Dodge automatic transmission?

Code P0729 should be addressed promptly to prevent further damage to the transmission system. Ignoring this code can lead to drivability issues and potential transmission failure.

4. Can a faulty speed sensor cause OBDII code P0729 in a Dodge transmission?

Yes, a malfunctioning output speed sensor or input speed sensor can contribute to triggering code P0729 by providing incorrect data to the ECM.

5. What are some DIY repair tips for OBDII code P0729 in a Dodge with automatic transmission?

DIY repair tips include checking and replacing damaged wiring harnesses, inspecting and replacing faulty speed sensors, and ensuring the transmission fluid is at the correct level and in good condition.

6. Is it safe to continue driving with OBDII code P0729 present in a Dodge vehicle?

It is not recommended to drive with code P0729 present, as it can lead to further damage to the transmission. It is advisable to address the issue promptly to avoid costly repairs.

7. How can a mechanic diagnose OBDII code P0729 in a Dodge automatic transmission?

A mechanic can diagnose code P0729 by using a scan tool to retrieve the code, checking the speed sensor readings, inspecting the wiring for damage, and performing a road test to assess the transmission's behavior.

8. What are the typical repair costs for fixing OBDII code P0729 in a Dodge automatic transmission?

The repair costs for addressing code P0729 can vary depending on the exact cause of the issue. Costs may range from a few hundred dollars for sensor replacement to over a thousand dollars for more extensive transmission repairs.

9. Can resetting the OBDII code P0729 in a Dodge transmission solve the issue temporarily?

Resetting the code may temporarily turn off the warning light, but it will not fix the underlying problem causing code P0729. It is crucial to identify and address the root cause of the issue for a lasting repair.

10. Does code P0729 affect the fuel efficiency of a Dodge vehicle with automatic transmission?

Yes, code P0729 can affect the fuel efficiency of the vehicle due to inefficient gear shifting and transmission performance. Resolving the issue can help improve fuel economy.