AutoCodes – Ford – P1635 2007 Ford Fusion

P1635 2007 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 2007 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 3,334

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 2007 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 2007 Ford Fusion - Tire / Axle Ratio Out of Acceptable Range - AutoCodes.com — P1635 2007 Ford Fusion Code - Tire / Axle Ratio Out of Acceptable Range

What does this mean?

What are the Possible Causes of the DTC P1635 2007 Ford Fusion?

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

How to Fix the DTC P1635 2007 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 2007 Ford Fusion
2007 Ford Fusion Factory Service Bulletin OBDII Code P1635

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1635 2007 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 2007 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 2007 Ford Fusion Code

1. What are common symptoms of OBDII code P1635 in a 2007 Ford Fusion related to the Tire / Axle Ratio Out of Acceptable Range issue?

- Common symptoms include the vehicle going into limp mode, decreased fuel efficiency, and potential issues with the transmission shifting.

2. What can cause the OBDII code P1635 in a 2007 Ford Fusion related to the Tire / Axle Ratio Out of Acceptable Range issue?

- The code can be triggered by a mismatch between the tire size or axle ratio specified in the vehicle's programming and the actual tire size or axle ratio on the vehicle.

3. How can I diagnose the OBDII code P1635 in a 2007 Ford Fusion related to the Tire / Axle Ratio Out of Acceptable Range issue?

- To diagnose this issue, you can use a diagnostic scanner to read the code and compare the programmed tire size and axle ratio values with the actual values on your vehicle.

4. What are the potential risks of ignoring the OBDII code P1635 related to the Tire / Axle Ratio Out of Acceptable Range issue in a 2007 Ford Fusion?

- Ignoring this code can lead to incorrect speedometer readings, transmission shifting issues, and potential damage to the transmission or drivetrain components.

5. Can I continue driving my 2007 Ford Fusion with the OBDII code P1635 related to the Tire / Axle Ratio Out of Acceptable Range issue?

- It is not recommended to drive the vehicle with this code present, as it can cause performance issues and potentially lead to further damage if left unaddressed.

6. How can I reset the OBDII code P1635 related to the Tire / Axle Ratio Out of Acceptable Range issue in my 2007 Ford Fusion?

- You can reset the code by using a diagnostic scanner to clear the code after addressing the underlying cause, such as correcting the tire size or axle ratio discrepancy.

7. Are there any DIY repair tips for addressing the OBDII code P1635 related to the Tire / Axle Ratio Out of Acceptable Range issue in a 2007 Ford Fusion?

- DIY repair tips may include verifying the correct tire size and axle ratio, ensuring they match the vehicle's specifications, and correcting any discrepancies to resolve the issue.

8. How much does it typically cost to repair the OBDII code P1635 related to the Tire / Axle Ratio Out of Acceptable Range issue in a 2007 Ford Fusion?

- The cost of repair can vary depending on the underlying cause, but it may involve adjustments to the tire size or axle ratio settings, which could be a relatively simple and inexpensive fix.

9. Can a mechanic help me fix the OBDII code P1635 related to the Tire / Axle Ratio Out of Acceptable Range issue in my 2007 Ford Fusion?

- Yes, a qualified mechanic can diagnose and repair this issue by adjusting the tire size or axle ratio settings to match the vehicle's specifications, ensuring proper functionality.

10. Will fixing the OBDII code P1635 related to the Tire / Axle Ratio Out of Acceptable Range issue improve the overall performance of my 2007 Ford Fusion?

- Yes, addressing this code can help restore normal performance, improve fuel efficiency, and prevent potential damage to transmission and drivetrain components.