AutoCodes – Ford – P1635 2002 Ford F150

P1635 2002 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 2002 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 4,367

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 2002 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 2002 Ford F150 - Tire / Axle Ratio Out of Acceptable Range - AutoCodes.com — P1635 2002 Ford F150 Code - Tire / Axle Ratio Out of Acceptable Range

What does this mean?

What are the Possible Causes of the DTC P1635 2002 Ford F150?

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

How to Fix the DTC P1635 2002 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 2002 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 2002 Ford F150 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 2002 Ford F150 Code

What does OBDII code P1635 mean for a 2002 Ford F150?

OBDII code P1635 indicates that the tire or axle ratio is out of the acceptable range, which can affect the vehicle's performance and fuel efficiency.

What symptoms might indicate a P1635 code?

Common symptoms include the check engine light being illuminated, inaccurate speedometer readings, and potential issues with transmission shifting.

What are the common causes of the P1635 code?

Causes can include incorrect tire size, a mismatch between the tire size and the axle ratio, or a faulty vehicle speed sensor.

How can I check if my tire size is causing the P1635 code?

You can verify your tire size by checking the specifications on the driver's side door jamb or the ownerâ€™s manual and comparing them to the original equipment tire size.

Is it safe to drive my 2002 Ford F150 with a P1635 code?

While it may be safe to drive, the vehicle may experience poor performance, reduced fuel economy, and potential transmission issues, so itâ€™s best to address the code promptly.

What repairs should I consider if I get a P1635 code?

You should check and possibly replace tires to ensure they match the recommended size, verify the axle ratio, and inspect the vehicle speed sensor for any faults.

Can a faulty speedometer cause a P1635 code?

Yes, a faulty speedometer can lead to incorrect readings, which may trigger the P1635 code if the system detects a discrepancy in the tire or axle ratio.

How do I reset the P1635 code after repairs?

You can reset the code by using an OBDII scanner to clear the trouble codes, or by disconnecting the battery for a few minutes, but ensure the underlying issue is resolved first.

Will changing the axle ratio affect the P1635 code?

Yes, changing the axle ratio to match the specifications of your vehicle can help resolve the P1635 code if the current ratio is incorrect.