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Engine-Codes – GMC – P0735 GMC

P0735 GMC Code - Transmission 5th Gear Ratio Incorrect

Quick Answer

When the diagnostic trouble code P0735 appears on a GMC vehicle, it indicates that there is an issue with the transmission's 5th gear ratio. Common causes include Faulty transmission solenoid, Low transmission fluid levels, Sensor malfunction. 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 GMC indicates Transmission 5th Gear Ratio Incorrect.
Common causes
Common causes include Faulty transmission solenoid, Low transmission fluid levels, Sensor malfunction.
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 Sep 12, 2024
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Code P0735 GMC Description

When the diagnostic trouble code P0735 appears on a GMC vehicle, it indicates that there is an issue with the transmission's 5th gear ratio. This means that the transmission is not shifting into 5th gear properly, leading to incorrect gear ratios and potentially causing performance issues. The transmission control module (TCM) monitors the gear ratios during operation, and when it detects that the 5th gear ratio is not within the expected range, it triggers this error code.

OBDII Code P0735 GMC - Transmission 5th Gear Ratio Incorrect
P0735 GMC Code - Transmission 5th Gear Ratio Incorrect

Common Causes of P0735 GMC

  1. Faulty transmission solenoid
  2. Low transmission fluid levels
  3. Sensor malfunction
  4. Internal mechanical issues within the transmission
  5. Wiring or connection issues in the transmission system

Symptoms of P0735 GMC

  1. Slipping or delayed engagement when shifting into 5th gear
  2. RPM fluctuations or surging while driving at consistent speeds
  3. Reduced fuel efficiency
  4. Harsh or erratic shifting patterns
  5. Illumination of the check engine light

How to Fix P0735 GMC

  1. Begin by conducting a thorough diagnostic scan to retrieve the exact trouble codes and identify the specific issue with the 5th gear ratio.
  2. Inspect the transmission fluid level and condition, topping off or replacing it if necessary.
  3. Test the transmission solenoid and sensors for proper function, replacing any faulty components.
  4. Perform a road test to verify that the transmission is now shifting correctly through all gears.
  5. Clear the trouble codes and reset the TCM to ensure that the issue has been resolved.

Cost to Fix P0735 GMC

The cost of repairing the transmission 5th gear ratio incorrect issue on a GMC vehicle can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, the cost can range from $200 to $800 for parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically between $80 and $150. Rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower prices. For a more accurate estimate, it's recommended to consult with a local auto repair shop.

What does this mean?

Tech Notes for P0735 GMC

Incorrect ratio Diagnostic Trouble Code (DTC) may indicate a component condition with piston seals, clutch plates, or solenoids or it may be caused by a faulty turbine or output speed sensor signal.

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Information for Specific GMC Models

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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