AutoCodes – Ford – P1635 1997 Ford F150

P1635 1997 Ford F150 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 1997 Ford F150 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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 2,439
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jul 29, 2020
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Code P1635 1997 Ford F150 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 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 1997 Ford F150 - Tire / Axle Ratio Out of Acceptable Range - AutoCodes.com
P1635 1997 Ford F150 Code - Tire / Axle Ratio Out of Acceptable Range

What are the Possible Causes of the DTC P1635 1997 Ford F150?

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

How to Fix the DTC P1635 1997 Ford F150?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1635 1997 Ford F150 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 1997 Ford F150 code?

Need more information on how to fix the P1635 1997 Ford F150 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1635 1997 Ford F150 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 1997 Ford F150 Code

1. What are the common symptoms of OBDII code P1635 on a 1997 Ford F150 related to Tire / Axle Ratio Out of Acceptable Range?

The common symptoms include issues with the vehicle's speedometer accuracy, erratic shifting of gears, and possible illumination of the Check Engine Light.

2. What causes the OBDII code P1635 on a 1997 Ford F150 related to Tire / Axle Ratio Out of Acceptable Range?

This code is typically triggered when there is a discrepancy between the tire size and axle ratio programmed in the vehicle's computer, often due to modifications or incorrect settings.

3. How can I diagnose the OBDII code P1635 on a 1997 Ford F150 related to Tire / Axle Ratio Out of Acceptable Range?

Diagnosis involves checking the tire size and axle ratio settings in the vehicle's computer, verifying any modifications made, and ensuring they match the actual physical components on the vehicle.

4. Can I continue to drive my 1997 Ford F150 with the OBDII code P1635 related to Tire / Axle Ratio Out of Acceptable Range?

It is generally safe to drive the vehicle with this code, but it is recommended to address the underlying issue to prevent potential transmission or drivability problems.

5. How do I repair the OBDII code P1635 on a 1997 Ford F150 related to Tire / Axle Ratio Out of Acceptable Range?

The repair process involves correcting any tire size or axle ratio discrepancies in the vehicle's computer, ensuring they match the actual physical components installed on the vehicle.

6. Can resetting the OBDII code P1635 on a 1997 Ford F150 related to Tire / Axle Ratio Out of Acceptable Range fix the issue?

Resetting the code may temporarily clear the Check Engine Light, but if the underlying cause of the code is not addressed, it is likely to reappear.

7. Are there any specific tools needed to diagnose and repair the OBDII code P1635 on a 1997 Ford F150 related to Tire / Axle Ratio Out of Acceptable Range?

A diagnostic scanner capable of reading and clearing OBDII codes and accessing the vehicle's computer settings may be necessary for proper diagnosis and repair.

8. Can changing the tire size or axle ratio on my 1997 Ford F150 trigger the OBDII code P1635 related to Tire / Axle Ratio Out of Acceptable Range?

Yes, any modifications to the tire size or axle ratio that are not properly updated in the vehicle's computer can trigger this code.

9. How do I prevent the OBDII code P1635 on a 1997 Ford F150 related to Tire / Axle Ratio Out of Acceptable Range from recurring?

To prevent the code from reoccurring, ensure that any changes made to the tire size or axle ratio are accurately reflected in the vehicle's computer settings.

10. Is the OBDII code P1635 on a 1997 Ford F150 related to Tire / Axle Ratio Out of Acceptable Range a common issue?

This code is not extremely common but can occur, especially after modifications to the vehicle's tire size or axle ratio.

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