P0729 Chevrolet Code - Transmission 6th Gear Ratio Incorrect
Quick Answer
The transmission turbine speed sensor and vehicle speed sensor are hall-effect sensors. Common causes include Low transmission fluid level, Shift solenoid mechanical fault, Faulty Turbine Sensor. 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 Chevrolet indicates Transmission 6th Gear Ratio Incorrect.
- Common causes
- Common causes include Low transmission fluid level, Shift solenoid mechanical fault, Faulty Turbine Sensor.
- 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.
Code P0729 Chevrolet Description
The TCM provides a 9 V reference circuit and a signal circuit to each of the sensors. As the 1-2-3-4-5-6 clutch piston housing and transmission output shaft or transfer case output rotates, the sensors produce a signal frequency based on the teeth on the reluctor wheel. The TCM calculates the transmission gear ratio based on the speed sensor signals and compares the calculated gear ratio to the commanded gear ratio.
The Diagnostic Trouble Code (DTC) will be set when the TCM detects the calculated gear ratio with 6th gear commanded differs from the known 6th gear ratio for 2 s.
What are the Possible Causes of the DTC P0729 Chevrolet?
- Low transmission fluid level
- Shift solenoid mechanical fault
- Faulty Turbine Sensor
- Faulty Output Speed Sensor
How to Fix the DTC P0729 Chevrolet?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0729 Chevrolet 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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Information for Specific Chevrolet Models
- P0729 2014 Chevrolet Silverado — Transmission 6th Gear Ratio Incorrect
- P0729 2015 Chevrolet Silverado — Transmission 6th Gear Ratio Incorrect
- P0729 2016 Chevrolet Silverado — Transmission 6th Gear Ratio Incorrect
- P0729 2017 Chevrolet Silverado — Transmission 6th Gear Ratio Incorrect
- P0729 2018 Chevrolet Silverado — Transmission 6th Gear Ratio Incorrect
Frequently Asked Questions about P0729 Chevrolet Code
1. What are the common symptoms of OBDII code P0729 in a Chevrolet related to the transmission 6th gear ratio?
- Common symptoms include harsh shifting, erratic transmission behavior, and the transmission slipping or failing to engage properly in 6th gear.
2. What are the possible causes of OBDII code P0729 in a Chevrolet indicating an incorrect 6th gear ratio?
- The code may be triggered by issues such as a faulty transmission speed sensor, a malfunctioning transmission control module, or problems with the gear ratio itself.
3. How can I diagnose the OBDII code P0729 in a Chevrolet for an incorrect 6th gear ratio?
- A proper diagnosis involves scanning the vehicle's onboard computer with an OBDII scanner to retrieve the specific fault code and then performing a detailed inspection of the transmission components.
4. Can driving with OBDII code P0729 in a Chevrolet indicating an incorrect 6th gear ratio cause further damage?
- Yes, driving with this code unresolved can potentially lead to further damage to the transmission components and may result in more costly repairs down the line.
5. What are some repair tips for fixing OBDII code P0729 in a Chevrolet related to the transmission 6th gear ratio?
- Repair tips may include checking and replacing the transmission speed sensor, inspecting and repairing any damaged wiring or connectors, and ensuring proper fluid levels and condition in the transmission.
6. Is it safe to continue driving my Chevrolet with OBDII code P0729 indicating an incorrect 6th gear ratio?
- It is not recommended to continue driving the vehicle with this code present, as it can lead to potential transmission issues and safety hazards on the road.
7. How much does it typically cost to repair OBDII code P0729 in a Chevrolet for an incorrect 6th gear ratio?
- The cost of repair can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.
8. Can resetting the OBDII code P0729 in a Chevrolet clear the issue related to the transmission 6th gear ratio?
- While clearing the code may temporarily reset the transmission control module, it will not fix the underlying issue causing the incorrect 6th gear ratio and the code is likely to reappear.
9. How long does it take to repair OBDII code P0729 in a Chevrolet for an incorrect 6th gear ratio?
- The repair time can vary depending on the extent of the issue and the specific repairs needed, but it may take a few hours to a full day at a repair shop.
10. Are there any preventative maintenance steps to avoid OBDII code P0729 in a Chevrolet related to the transmission 6th gear ratio?
- Regular transmission fluid changes, maintaining proper driving habits, and addressing any transmission-related issues promptly can help prevent the occurrence of this code.
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