P0729 Lexus 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 Lexus 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 Lexus Description
What are the Possible Causes of the DTC P0729 Lexus?
- Low transmission fluid level
- Shift solenoid mechanical fault
- Hydraulic circuit fault
- Transmission failure
How to Fix the DTC P0729 Lexus?
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 Lexus 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 Lexus Code
1. What does OBDII code P0729 mean on a Lexus?
P0729 indicates the 6th gear ratio in the automatic transmission is incorrect, meaning the gear is not engaging properly or the expected RPM and speed do not match.
2. What are common symptoms of code P0729 in a Lexus?
Symptoms may include transmission slipping, poor acceleration in higher gears, erratic shifting, reduced fuel efficiency, and the check engine light being illuminated.
3. What causes the P0729 code in a Lexus?
Common causes include a faulty transmission solenoid, damaged clutch packs, low transmission fluid, or an issue with the transmission control module (TCM).
4. Can driving with code P0729 damage my Lexus?
Yes, driving with this code can cause further damage to the transmission, as improper gear ratios can result in increased wear and overheating.
5. How do I fix code P0729 on a Lexus?
Repairs could include replacing faulty solenoids, addressing internal transmission damage, refilling or replacing transmission fluid, or reprogramming the TCM.
6. How is P0729 diagnosed in a Lexus?
Technicians typically use a scan tool to check for related codes, inspect transmission fluid levels and condition, and perform tests on transmission solenoids and internal components.
7. Does low transmission fluid cause P0729 on a Lexus?
Yes, low or degraded transmission fluid can cause improper gear engagement and contribute to the P0729 code.
8. How much does it cost to fix code P0729 on a Lexus?
Repair costs vary widely depending on the cause, ranging from a few hundred dollars for a solenoid replacement to several thousand for a transmission rebuild.
9. Can resetting the check engine light clear code P0729 in a Lexus?
Resetting the light may temporarily clear the code, but the underlying issue must be fixed to prevent it from returning.
10. Is P0729 specific to the 6th gear in Lexus vehicles?
Yes, P0729 specifically relates to an incorrect gear ratio detected in the 6th gear of the automatic transmission.
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