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P1635 2009 Ford Fusion Code - Tire / Axle Ratio Out of Acceptable Range

Quick Answer

The P1635 diagnostic trouble code (DTC) for a 2009 Ford Fusion indicates that the tire or axle ratio is out of an acceptable range. Common causes include Incorrectly sized tires, Modified axle ratio, Faulty wheel speed 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
P1635 2009 Ford Fusion indicates Tire / Axle Ratio Out of Acceptable Range.
Common causes
Common causes include Incorrectly sized tires, Modified axle ratio, Faulty wheel speed 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 Sep 29, 2024
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Code P1635 2009 Ford Fusion Description

The P1635 diagnostic trouble code (DTC) for a 2009 Ford Fusion indicates that the tire or axle ratio is out of an acceptable range. This code is typically triggered when the vehicle's onboard computer detects a discrepancy between the expected tire size or axle ratio and the actual values being reported by sensors. The tire size and axle ratio are crucial parameters that the vehicle's computer uses to calculate speed, fuel efficiency, and other performance metrics accurately.

OBDII Code P1635 2009 Ford Fusion - Tire / Axle Ratio Out of Acceptable Range
P1635 2009 Ford Fusion Code - Tire / Axle Ratio Out of Acceptable Range

Common Causes of P1635 2009 Ford Fusion

  1. Incorrectly sized tires
  2. Modified axle ratio
  3. Faulty wheel speed sensors
  4. Wiring issues
  5. Malfunctioning ABS system

Symptoms of P1635 2009 Ford Fusion

  1. Incorrect speedometer readings
  2. Reduced fuel efficiency
  3. Transmission shifting issues
  4. Poor acceleration
  5. Illuminated check engine light

How to Fix P1635 2009 Ford Fusion

  1. Verify the tire size and axle ratio specified for the vehicle in the owner's manual or on the driver's side door jamb.
  2. Check the actual tire size and axle ratio on the vehicle to confirm any discrepancies.
  3. Inspect the wheel speed sensors and wiring for any damage or malfunctions.
  4. Correct any tire size or axle ratio discrepancies by replacing tires or adjusting axle components as needed.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix P1635 2009 Ford Fusion

The typical repair costs for addressing a P1635 code on a 2009 Ford Fusion can range from $100 to $500, depending on the specific cause of the issue and the required repairs. This estimate includes parts and labor, but actual costs may vary based on the location, vehicle make and model, and the rates charged by auto repair shops. It is advisable to consult with a qualified mechanic to get an accurate cost estimate for this repair.

What does this mean?

Tech Notes for P1635 2009 Ford Fusion

On some Ford models, the Powertrain Control Module (PCM) DTC P1635 indicates that the tire size or axle ratio programmed into the PCM is not correct for the PCM calibration present in the PCM. This DTC can be caused by a modified PCM calibration, or a tire size or axle ratio programmed into the PCM that does not match the vehicle's build information.



After a new Powertrain Control Module (PCM) has been installed, the Vehicle Identification (VID) block must be programmed into the PCM.



There is a Factory Service Bulletin for the 2009 Ford Fusion

2009 Ford Fusion Factory Service Bulletin OBDII Code P1635

Need more information about the P1635 2009 Ford Fusion code?

Need more information on how to fix the P1635 2009 Ford Fusion code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1635 2009 Ford Fusion code diagnosed by a professional: Find a repair shop in your area

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.

Frequently Asked Questions about P1635 2009 Ford Fusion Code

1. What does OBDII code P1635 on a 2009 Ford Fusion mean?

Code P1635 indicates that the tire or axle ratio is out of an acceptable range in the vehicle's system.

2. What are the common symptoms of OBDII code P1635 in a 2009 Ford Fusion?

Common symptoms include issues with the vehicle's stability control, traction control, ABS system, or abnormal handling characteristics.

3. What can cause the OBDII code P1635 to trigger in a 2009 Ford Fusion?

Potential causes for this code include incorrect tire size, improper axle ratio configuration, faulty wheel speed sensors, or damaged wiring.

4. How can I diagnose and repair OBDII code P1635 on a 2009 Ford Fusion?

Start by checking the tire sizes on all four wheels, verifying the axle ratio settings, inspecting the wheel speed sensors, and examining the wiring harness for any damage.

5. Can driving with OBDII code P1635 on a 2009 Ford Fusion cause further damage?

Continuing to drive with this code may lead to issues with the vehicle's safety systems and could potentially affect overall driving performance. It is recommended to address the problem promptly.

6. Will resetting the OBDII code P1635 on a 2009 Ford Fusion resolve the issue?

Simply clearing the code may temporarily remove the warning light, but if the underlying problem persists, the code is likely to reappear. Proper diagnosis and repair are necessary for a lasting solution.

7. Is it safe to ignore OBDII code P1635 in a 2009 Ford Fusion?

Ignoring this code can compromise the vehicle's safety features and handling. It is advisable to address the issue promptly to ensure optimal driving conditions.

8. Can a DIY enthusiast fix OBDII code P1635 on a 2009 Ford Fusion?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address this code by checking tire sizes, verifying axle ratios, and inspecting sensors and wiring carefully.

9. How much does it typically cost to repair OBDII code P1635 on a 2009 Ford Fusion?

The cost of repairing this code can vary based on the exact cause of the issue. Expenses may include labor costs for diagnosis and repair, replacement of sensors or wiring, or adjustments to tire sizes and axle ratios.

10. Will fixing OBDII code P1635 improve the fuel efficiency of a 2009 Ford Fusion?

While resolving this code may not directly impact fuel efficiency, ensuring that the vehicle's systems are functioning correctly can contribute to overall performance and potentially optimize fuel consumption.

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