P0735 - Transmission Gear Ratio Error (Common in 2005-2010 Ford F-150 and 2006-2011 Chevrolet Malibu)

Quick Answer

P0735 means: P0735 means a transmission gear ratio error related to fifth gear.

Fix: Check and replace faulty components Cost: $100 - $200 Time: 90-180 minutes

Can I drive with P0735? Immediate action is recommended to prevent transmission damage.

Common Questions

What does P0735 mean and how does it affect my car?

The P0735 code indicates a problem with your vehicle's transmission system, specifically regarding the fifth gear ratio. This can lead to poor shifting performance, decreased fuel efficiency, and potential transmission damage if not addressed promptly.

What are the most common causes of P0735 and how much does it cost to fix?

Common causes of P0735 include low or contaminated transmission fluid, faulty transmission range sensors, and worn internal components. Repair costs can range from $100 for a fluid change to $1500 for a full transmission service.

Can I drive my car with P0735 or should I stop immediately?

Driving with a P0735 code is not recommended as it indicates a transmission issue that could worsen, leading to more severe damage. It's advisable to address the problem as soon as possible.

How can I diagnose P0735 myself using GeekOBD APP?

Using the GeekOBD APP, you can scan for DTCs, view freeze frame data, and monitor real-time sensor readings to help identify the specific issue related to the P0735 code.

What vehicles are most commonly affected by P0735?

P0735 is commonly found in vehicles like the 2005-2010 Ford F-150 and 2006-2011 Chevrolet Malibu. These models may have documented issues that have been addressed in recalls or Technical Service Bulletins (TSBs).

How can I prevent P0735 from happening again?

Regular maintenance, including timely transmission fluid changes and inspections, can help prevent P0735 and other transmission-related issues.

What is P0735?

The Diagnostic Trouble Code (DTC) P0735 indicates that the transmission control module (TCM) has detected an incorrect gear ratio in the transmission system. This can happen when the transmission fails to shift into the fifth gear properly or when the TCM receives a signal that is not within the expected range. In practical terms, this means that your vehicle may experience issues with shifting, which can result in poor acceleration, decreased fuel efficiency, or even complete transmission failure if not addressed. The problem typically stems from issues related to the transmission fluid, such as low levels, contamination, or mechanical failures within the transmission itself. Additionally, electrical issues such as damaged wiring or faulty sensors can trigger this code. If you notice your check engine light illuminated or your vehicle exhibiting unusual shifting patterns, it’s critical to take action. Ignoring a P0735 code can lead to more severe transmission problems that can be costly to repair. Therefore, understanding this code and its implications is essential for maintaining the health of your vehicle’s transmission system.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P0735 is present:

  • The check engine light remains illuminated, indicating a potential issue with the transmission system.
  • You may experience sluggish acceleration, where the vehicle feels like it is struggling to gain speed, particularly when shifting into higher gears.
  • Fuel economy may drop significantly, potentially by 10-15%, due to improper gear shifting and increased engine load.
  • Unusual noises such as grinding or whining when the vehicle is in gear could also be a sign of deeper transmission issues.
  • You may notice the transmission slipping, where the engine revs without a corresponding increase in vehicle speed, indicating a failure in the gear engagement.

Possible Causes

Most common causes of P0735 (ordered by frequency):

  1. The most common cause of a P0735 code is low or contaminated transmission fluid, which can occur due to leaks or lack of maintenance, with about 60% of cases relating to fluid issues.
  2. Another significant cause could be a malfunctioning transmission range sensor, which sends incorrect signals to the TCM, impacting its ability to determine the correct gear ratio.
  3. Worn or damaged internal transmission components, such as clutches or gears, can lead to improper gear engagement, a less common cause but critical to check.
  4. Less frequently, issues with the vehicle's wiring harness, such as shorts or open circuits affecting the TCM, can result in a P0735 code.
  5. A rare cause could be a faulty TCM itself, which may require reprogramming or replacement, though it's typically a last-resort diagnosis.

P0735 Repair Costs

Cost Breakdown by Repair Type

Transmission Fluid Change

Changing the old, contaminated transmission fluid to new fluid can resolve many issues associated with P0735.

  • Total: $100 - $200
  • Success rate: 70%
Transmission Range Sensor Replacement

Replacing a faulty transmission range sensor can restore proper communication and shifting.

  • Total: $150 - $300
  • Success rate: 80%
Full Transmission Service

Involves a thorough inspection and replacement of worn components; more comprehensive but necessary for severe cases.

  • Total: $800 - $1500
  • Success rate: 90%
Money-Saving Tips for P0735
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional P0735 Diagnosis Process

Follow these systematic steps to accurately diagnose P0735. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the transmission range sensor and other related components (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the transmission range sensor and other related components (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success, ensuring all gears engage correctly (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success, ensuring all gears engage correctly (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Transmission Fluid Change Resolved P0735 on 2007 Ford F-150

Vehicle: 2007 Ford F-150, 85,000 miles

Problem: Customer reported check engine light and sluggish acceleration.

Diagnosis: Diagnostic revealed P0735 code and low transmission fluid level.

Solution: Changed the transmission fluid and filter, resolving the issue.

Cost: $150 (fluid and filter replacement)

Result: The check engine light turned off, and acceleration improved significantly.

Case Study 2: Transmission Range Sensor Replacement for 2010 Chevrolet Malibu

Vehicle: 2010 Chevrolet Malibu, 75,000 miles

Problem: Customer experienced erratic shifting and check engine light.

Diagnosis: P0735 code pointed to a faulty transmission range sensor.

Solution: Replaced the transmission range sensor.

Cost: $200 (part and labor)

Result: Vehicle shifted smoothly post-repair, and the check engine light remained off.

Diagnose P0735

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P0735
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes