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P0735 Lexus Code - Gear 5 Incorrect Ratio

Quick Answer

The P0735 diagnostic trouble code in a Lexus indicates that there is an incorrect ratio detected in the transmission's fifth gear. Common causes include Low transmission fluid level or dirty fluid, Faulty transmission solenoids, Malfunctioning transmission sensors. 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
P0735 Lexus indicates Gear 5 Incorrect Ratio.
Common causes
Common causes include Low transmission fluid level or dirty fluid, Faulty transmission solenoids, Malfunctioning transmission sensors.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P0735 Lexus Description

The P0735 diagnostic trouble code in a Lexus indicates that there is an incorrect ratio detected in the transmission's fifth gear. This means that the transmission is not shifting properly into fifth gear, which can lead to issues with acceleration, fuel efficiency, and overall performance of the vehicle. This problem can be caused by various factors such as faulty sensors, solenoids, or internal transmission components.

OBDII Code P0735 Lexus - Gear 5 Incorrect Ratio
P0735 Lexus Code - Gear 5 Incorrect Ratio

Common Causes of P0735 Lexus

  1. Low transmission fluid level or dirty fluid
  2. Faulty transmission solenoids
  3. Malfunctioning transmission sensors
  4. Internal transmission damage
  5. Electrical issues in the transmission control module

Symptoms of P0735 Lexus

  1. Delayed or harsh shifting into fifth gear
  2. Slipping or jerking when driving at high speeds
  3. Decreased fuel efficiency
  4. Illumination of the Check Engine Light
  5. Transmission overheating

How to Fix P0735 Lexus

  1. Check and top off transmission fluid levels
  2. Perform a transmission fluid flush and filter replacement
  3. Replace faulty transmission solenoids or sensors
  4. Inspect and repair any internal transmission damage
  5. Reset the transmission control module and perform a relearn procedure

Cost to Fix P0735 Lexus

The cost of repairing a P0735 code in a Lexus can vary depending on the specific cause of the issue. In general, you can expect to pay anywhere from $200 to $800 for parts and labor. However, it's important to keep in mind that diagnosis time and labor rates can impact the final cost, so it's best to get a quote from a reputable auto repair shop in your area.

What does this mean?

Tech Notes for P0735 Lexus

Start by inspecting the transmission fluid level and condition, and change fluid if necessary.

When is the Code Detected?

P0735 is detected when A/T cannot be shifted to the 5th gear position even if electrical circuit is good.

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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.

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