AutoCodes – Ford – P1635 2011 Ford Fusion

P1635 2011 Ford Fusion Code - Tire / Axle Ratio Out of Acceptable Range

Quick Answer

The All-Wheel Drive (AWD) system continuously monitors vehicle conditions and automatically adjusts the torque distribution between the front and rear wheels. Common causes include Incorrect tire size, Incorrect axle ratio, Incorrect Vehicle ID block configuration parameters. 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 2011 Ford Fusion indicates Tire / Axle Ratio Out of Acceptable Range.
Common causes: Common causes include Incorrect tire size, Incorrect axle ratio, Incorrect Vehicle ID block configuration parameters.
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.

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Code Popularity 2,677

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 09, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1635 2011 Ford Fusion Description

The All-Wheel Drive (AWD) system continuously monitors vehicle conditions and automatically adjusts the torque distribution between the front and rear wheels. During normal operation, most of the torque is sent to the front wheels. If a wheel slip between the front and rear wheels is detected or the vehicle is under heavy acceleration, the AWD system increases torque to the rear wheels. When the 4X4 control module detects inappropriate mini spare or road wheels/tires (greater than 7% across the front and rear axle or 14% at one wheel) installed, this Diagnostic Trouble Code (DTC) is set.

OBDII Code P1635 2011 Ford Fusion - Tire / Axle Ratio Out of Acceptable Range - AutoCodes.com — P1635 2011 Ford Fusion Code - Tire / Axle Ratio Out of Acceptable Range

What does this mean?

What are the Possible Causes of the DTC P1635 2011 Ford Fusion?

Incorrect tire size
Incorrect axle ratio
Incorrect Vehicle ID block configuration parameters

How to Fix the DTC P1635 2011 Ford Fusion?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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 2011 Ford Fusion
2011 Ford Fusion Factory Service Bulletin OBDII Code P1635

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1635 2011 Ford Fusion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1635 2011 Ford Fusion code?

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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.

Frequently Asked Questions about P1635 2011 Ford Fusion Code

1. What does OBDII code P1635 on a 2011 Ford Fusion indicate?

The code P1635 on a 2011 Ford Fusion signifies that the Tire / Axle Ratio is out of an acceptable range.

2. What are the common symptoms of OBDII code P1635 in a 2011 Ford Fusion?

Common symptoms of code P1635 in a 2011 Ford Fusion may include issues with the vehicle's transmission shifting, incorrect speedometer readings, and the illumination of the Check Engine Light.

3. What can cause the OBDII code P1635 to trigger in a 2011 Ford Fusion?

The Tire / Axle Ratio Out of Acceptable Range code (P1635) in a 2011 Ford Fusion can be triggered by a mismatch between the tire size and axle ratio, a faulty speed sensor, or issues with the vehicle's transmission control module.

4. How can I diagnose the cause of OBDII code P1635 in my 2011 Ford Fusion?

To diagnose the cause of code P1635 in a 2011 Ford Fusion, you may need to check the tire size and axle ratio compatibility, inspect the speed sensor for any damage, and perform a scan of the vehicle's transmission control module for any faults.

5. Can I continue driving my 2011 Ford Fusion with OBDII code P1635?

It is not recommended to continue driving your 2011 Ford Fusion with the P1635 code unresolved, as it can lead to potential transmission issues and inaccurate speedometer readings.

6. How can I repair OBDII code P1635 in my 2011 Ford Fusion?

To repair code P1635 in a 2011 Ford Fusion, you may need to correct the tire size and axle ratio mismatch, replace a faulty speed sensor, or reprogram the transmission control module to ensure proper communication.

7. Is it necessary to reset the OBDII code P1635 after repairs on a 2011 Ford Fusion?

After addressing the underlying issue causing code P1635 in a 2011 Ford Fusion, it is recommended to clear the code using an OBDII scanner to reset the Check Engine Light and ensure the repair was successful.

8. Will OBDII code P1635 affect the fuel efficiency of my 2011 Ford Fusion?

While code P1635 directly relates to the tire / axle ratio and transmission operation, unresolved issues can impact the overall performance of your 2011 Ford Fusion, potentially affecting fuel efficiency.

9. Can a DIY enthusiast fix OBDII code P1635 in a 2011 Ford Fusion?

Depending on the root cause of code P1635, some DIY enthusiasts with automotive repair knowledge may be able to address the issue themselves by performing tasks like checking tire size compatibility or replacing a speed sensor.

10. How much does it typically cost to repair OBDII code P1635 on a 2011 Ford Fusion?

The cost to repair code P1635 on a 2011 Ford Fusion can vary based on the specific cause of the issue, but it may involve expenses for parts like a speed sensor or potential labor charges if professional assistance is required for diagnosis and repair.