P0729 Nissan 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 Nissan 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.
Code P0729 Nissan Description
What are the Possible Causes of the DTC P0729 Nissan?
- Low transmission fluid level
- Shift solenoid mechanical fault
- Hydraulic circuit fault
- Transmission failure
How to Fix the DTC P0729 Nissan?
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
2009-2011 Nissan GT-R Factory Service Bulletin OBDII Code P0729
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0729 Nissan 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 Nissan Code
What does the OBDII code P0729 mean for a Nissan?
P0729 indicates that the automatic transmission's 6th gear has an incorrect gear ratio, which may affect shifting performance and drivability.
What are common symptoms of code P0729 in a Nissan?
Symptoms include transmission slipping, delayed or harsh shifting, poor acceleration, and the Check Engine Light being illuminated.
What causes the P0729 code on a Nissan?
Common causes include a faulty transmission solenoid, worn clutch packs, low transmission fluid, or issues with the transmission control module (TCM).
Can driving with code P0729 damage my Nissan?
Yes, driving with this code can lead to further transmission damage or unsafe driving conditions, so it should be addressed promptly.
How is code P0729 diagnosed on a Nissan vehicle?
A mechanic will use a scan tool to confirm the code, check transmission fluid levels, inspect solenoids, and possibly perform a pressure test or internal transmission inspection.
What repairs are needed for code P0729 in a Nissan?
Repairs may include replacing a faulty solenoid, repairing or rebuilding the transmission, topping off or replacing transmission fluid, or updating/reprogramming the TCM.
Can low transmission fluid cause code P0729 on a Nissan?
Yes, insufficient or degraded transmission fluid can lead to incorrect gear ratios and trigger this code.
Does code P0729 only affect the 6th gear in a Nissan?
Primarily, yes, but issues with the 6th gear can indirectly impact other gears and overall transmission performance.
How much does it cost to fix code P0729 in a Nissan?
Repair costs vary, ranging from $150 for solenoid replacement to $3,000 or more for a full transmission rebuild, depending on the severity of the issue.
Is code P0729 specific to Nissan vehicles?
No, P0729 is a generic OBDII code and can appear in vehicles from other manufacturers with automatic transmissions.
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