P0729 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado?
- Low transmission fluid level
- Shift solenoid mechanical fault
- Faulty Turbine Sensor
- Faulty Output Speed Sensor
How to Fix the DTC P0729 2018 Chevrolet Silverado?
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 2018 Chevrolet Silverado 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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Frequently Asked Questions about P0729 2018 Chevrolet Silverado Code
1. What does OBDII code P0729 on a 2018 Chevrolet Silverado indicate?
The P0729 code signifies that the transmission is reporting an incorrect ratio for the 6th gear.
2. What are the common symptoms of OBDII code P0729 in a 2018 Chevrolet Silverado?
Common symptoms include harsh shifting, decreased fuel efficiency, engine stalling, and the transmission slipping or failing to engage properly.
3. What are some possible causes of OBDII code P0729 in a 2018 Chevrolet Silverado?
Potential causes include a faulty transmission speed sensor, issues with the transmission control module, low transmission fluid level, or mechanical problems within the transmission itself.
4. How can I diagnose the OBDII code P0729 on my 2018 Chevrolet Silverado?
Diagnosis typically involves using a scan tool to retrieve the trouble codes, checking the transmission fluid level and condition, inspecting the speed sensor, and conducting a thorough transmission system inspection.
5. Can I continue driving my 2018 Chevrolet Silverado with OBDII code P0729 present?
It is not recommended to continue driving with this code present, as it can lead to further damage to the transmission and potentially leave you stranded on the road.
6. How can I repair OBDII code P0729 on my 2018 Chevrolet Silverado?
Repairs may involve replacing the faulty speed sensor, addressing transmission control module issues, ensuring proper transmission fluid levels, or repairing any mechanical faults within the transmission.
7. Is it possible to reset OBDII code P0729 on a 2018 Chevrolet Silverado without fixing the underlying issue?
While you can clear the trouble code temporarily, it is crucial to address the root cause of the problem to prevent further transmission damage and ensure the vehicle operates properly.
8. How much does it typically cost to repair OBDII code P0729 on a 2018 Chevrolet Silverado?
Repair costs 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.
9. Can a DIY enthusiast fix OBDII code P0729 on a 2018 Chevrolet Silverado?
Depending on the individual's skill level and access to tools, some may be able to address simpler causes like checking and topping up transmission fluid. However, complex issues may require professional diagnosis and repair.
10. How can I prevent OBDII code P0729 from occurring in my 2018 Chevrolet Silverado?
Regularly servicing the transmission, checking for leaks, maintaining proper fluid levels, and addressing any abnormal symptoms promptly can help prevent the recurrence of this code.
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