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P1635 2012 Ford Fusion Code - Tire / Axle Ratio Out of Acceptable Range

Quick Answer

The P1635 diagnostic trouble code (DTC) for a 2012 Ford Fusion indicates that the tire or axle ratio is out of an acceptable range. Common causes include Faulty wheel speed sensors, Damaged wiring or connectors, Malfunctioning ECM. 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 2012 Ford Fusion indicates Tire / Axle Ratio Out of Acceptable Range.
Common causes
Common causes include Faulty wheel speed sensors, Damaged wiring or connectors, Malfunctioning ECM.
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 13, 2024
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Code P1635 2012 Ford Fusion Description

The P1635 diagnostic trouble code (DTC) for a 2012 Ford Fusion indicates that the tire or axle ratio is out of an acceptable range. This code typically points to an issue with the vehicle's traction control system, specifically related to the wheel speed sensors. The wheel speed sensors are responsible for monitoring the speed of each wheel and sending this information to the vehicle's electronic control module (ECM). When the ECM detects a discrepancy in the wheel speeds, it can trigger the P1635 code.

OBDII Code P1635 2012 Ford Fusion - Tire / Axle Ratio Out of Acceptable Range
P1635 2012 Ford Fusion Code - Tire / Axle Ratio Out of Acceptable Range

Common Causes of P1635 2012 Ford Fusion

  1. Faulty wheel speed sensors
  2. Damaged wiring or connectors
  3. Malfunctioning ECM
  4. Issues with wheel bearings or axles

Symptoms of P1635 2012 Ford Fusion

  1. Traction control system activation
  2. Loss of control and stability while driving
  3. Reduced fuel efficiency
  4. Increased tire wear
  5. Potential damage to other components

How to Fix P1635 2012 Ford Fusion

  1. Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the specific trouble code and any additional codes that may be present.
  2. Inspect the wheel speed sensors, wiring, and connectors for any signs of damage or corrosion. Replace any faulty components as needed.
  3. Test the ECM to ensure it is functioning correctly. If necessary, reprogram or replace the ECM to address the issue.
  4. Check the wheel bearings and axles for any wear or damage that could be affecting the tire or axle ratio. Replace any worn components to restore proper functionality.
  5. Clear the trouble codes from the vehicle's ECM and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P1635 2012 Ford Fusion

The typical repair costs for addressing a P1635 code on a 2012 Ford Fusion can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Factors such as location, vehicle make and model, and engine type can also impact repair costs. It's recommended to obtain quotes from multiple repair shops to ensure a competitive price for the necessary repairs.

What does this mean?

Tech Notes for P1635 2012 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 2012 Ford Fusion

2012 Ford Fusion Factory Service Bulletin OBDII Code P1635

Need more information about the P1635 2012 Ford Fusion code?

Need more information on how to fix the P1635 2012 Ford Fusion code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1635 2012 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 2012 Ford Fusion Code

1. What are the common symptoms of OBDII code P1635 in a 2012 Ford Fusion?

- Common symptoms include the Check Engine light illuminating, reduced engine performance, and potential issues with the vehicle's transmission.

2. What does the OBDII code P1635 "Tire / Axle Ratio Out of Acceptable Range" mean for a 2012 Ford Fusion?

- This code indicates that the tire or axle ratio settings in the vehicle's computer are not within the acceptable range, potentially affecting the vehicle's performance.

3. What are the possible causes of OBDII code P1635 in a 2012 Ford Fusion?

- Possible causes include incorrect tire size or axle ratio settings, faulty wheel speed sensors, damaged wiring harnesses, or issues with the vehicle's computer system.

4. How can I diagnose the OBDII code P1635 in my 2012 Ford Fusion?

- Diagnosis typically involves checking the tire size and axle ratio settings, inspecting the wheel speed sensors, testing the wiring for any damage, and using a diagnostic scan tool to read the code.

5. Can I continue driving my 2012 Ford Fusion with OBDII code P1635 present?

- It is generally not recommended to drive with this code active, as it can lead to further damage to the vehicle and potential safety issues. It is best to address the underlying problem promptly.

6. How can I repair OBDII code P1635 in my 2012 Ford Fusion?

- Repair options may include correcting the tire size and axle ratio settings, replacing faulty wheel speed sensors, repairing damaged wiring, or resetting the vehicle's computer system.

7. Is it possible to reset the OBDII code P1635 in a 2012 Ford Fusion without repairing the issue?

- While clearing the code with a diagnostic scan tool may temporarily turn off the Check Engine light, the underlying problem will persist and the code is likely to reappear until the issue is resolved.

8. Can a DIY enthusiast fix OBDII code P1635 in a 2012 Ford Fusion?

- Depending on the cause of the code, some repairs related to tire size adjustments or sensor replacements may be feasible for experienced DIYers. However, complex issues may require professional help.

9. Will fixing OBDII code P1635 improve the fuel efficiency of my 2012 Ford Fusion?

- Resolving this code may help restore proper engine performance and improve fuel efficiency, especially if the issue was affecting the vehicle's transmission or overall drivability.

10. How much does it typically cost to repair OBDII code P1635 in a 2012 Ford Fusion?

- The cost of repair can vary depending on the cause of the code and whether professional assistance is needed. Simple fixes like adjusting tire settings may be inexpensive, while sensor replacements or computer system repairs could be more costly.

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