AutoCodes – Ford – P1635 2001 Ford F150

P1635 2001 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 2001 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.

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Code Popularity 3,434

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 Jul 29, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1635 2001 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 2001 Ford F150 - Tire / Axle Ratio Out of Acceptable Range - AutoCodes.com — P1635 2001 Ford F150 Code - Tire / Axle Ratio Out of Acceptable Range

What does this mean?

What are the Possible Causes of the DTC P1635 2001 Ford F150?

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

How to Fix the DTC P1635 2001 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 2001 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 2001 Ford F150 code?

Need more information on how to fix the P1635 2001 Ford F150 code? Get Access to Factory Service Manuals

Need Help with the 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 2001 Ford F150 Code

1. What are the common symptoms of OBDII code P1635 on a 2001 Ford F150 related to tire/axle ratio?

The common symptoms include issues with the vehicle's speedometer accuracy, traction control system, and cruise control functionality.

2. What can cause the OBDII code P1635 related to tire/axle ratio on a 2001 Ford F150?

The code P1635 can be triggered by changes in tire size, axle ratio modifications, or issues with the speed sensor calibration.

3. How can I diagnose the OBDII code P1635 on my 2001 Ford F150 indicating tire/axle ratio out of acceptable range?

Performing a thorough inspection of the tires, axles, speed sensor, and related wiring can help diagnose the exact cause of the code.

4. What are the potential risks of ignoring the OBDII code P1635 on a 2001 Ford F150 regarding tire/axle ratio?

Ignoring the code P1635 can lead to inaccurate speed readings, affecting the vehicle's performance and safety systems.

5. Can I clear the OBDII code P1635 related to tire/axle ratio on a 2001 Ford F150 with a diagnostic tool?

Clearing the code with a diagnostic tool may temporarily resolve the issue, but it is essential to address the root cause to prevent the code from reappearing.

6. Is it possible to fix the OBDII code P1635 indicating tire/axle ratio out of acceptable range on a 2001 Ford F150 without professional help?

Simple fixes like recalibrating the speed sensor or adjusting tire pressures may help resolve the issue, but complex problems may require professional diagnosis and repair.

7. Can changing the tire size or axle ratio trigger the OBDII code P1635 on a 2001 Ford F150?

Yes, alterations to the tire size or axle ratio without recalibrating the speed sensor can cause the code P1635 to appear due to discrepancies in the vehicle's speed data.

8. What are some repair tips for addressing the OBDII code P1635 related to tire/axle ratio on a 2001 Ford F150?

Ensure that the tires are properly inflated, verify the axle ratio matches the vehicle specifications, and consider recalibrating the speed sensor to resolve the issue.

9. How much does it typically cost to repair the OBDII code P1635 on a 2001 Ford F150 related to tire/axle ratio?

The cost of repairing the code P1635 can vary depending on the underlying cause, but it may involve recalibration, sensor replacement, or other diagnostic procedures.

10. Can the OBDII code P1635 indicating tire/axle ratio issues on a 2001 Ford F150 affect the vehicle's fuel efficiency?

While the code itself may not directly impact fuel efficiency, addressing the underlying tire/axle ratio concerns can help maintain optimal performance and fuel economy.