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Engine-Codes – Ford – P1635 2001 Ford F150

P1635 2001 Ford F150 Code - Tire / Axle Ratio Out of Acceptable Range

Quick Answer

The P1635 diagnostic trouble code (DTC) for a 2001 Ford F150 indicates that the tire or axle ratio is out of an acceptable range. Common causes include Installation of incorrect tire size, Aftermarket modifications to the vehicle's suspension or drivetrain, Faulty wheel speed sensors. 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 Installation of incorrect tire size, Aftermarket modifications to the vehicle's suspension or drivetrain, Faulty wheel speed sensors.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P1635 2001 Ford F150 Description

The P1635 diagnostic trouble code (DTC) for a 2001 Ford F150 indicates that the tire or axle ratio is out of an acceptable range. This code is typically triggered when the vehicle's onboard computer detects a discrepancy between the expected tire size or axle ratio and the actual values being reported by the sensors. The tire size and axle ratio are crucial parameters that the vehicle's computer uses to calculate various functions such as speed, fuel efficiency, and transmission shifting points. When these values are incorrect or out of range, it can lead to performance issues and potentially cause damage to the vehicle's systems.

OBDII Code P1635 2001 Ford F150 - Tire / Axle Ratio Out of Acceptable Range
P1635 2001 Ford F150 Code - Tire / Axle Ratio Out of Acceptable Range

Common Causes of P1635 2001 Ford F150

  1. Installation of incorrect tire size
  2. Aftermarket modifications to the vehicle's suspension or drivetrain
  3. Faulty wheel speed sensors
  4. Wiring issues or sensor malfunctions
  5. Software glitches in the vehicle's onboard computer

Symptoms of P1635 2001 Ford F150

  1. Inaccurate speedometer readings
  2. Incorrect odometer readings
  3. Transmission shifting issues
  4. Decreased fuel efficiency
  5. Traction control or ABS warning lights

How to Fix P1635 2001 Ford F150

  1. Verify the correct tire size and axle ratio for the vehicle by consulting the owner's manual or contacting a dealership.
  2. Inspect the tires and wheels to ensure they match the manufacturer's specifications.
  3. Check the wheel speed sensors and wiring for any damage or malfunctions.
  4. Reset the vehicle's onboard computer to clear the code and recalibrate the tire size and axle ratio.
  5. Test drive the vehicle to confirm that the issue has been resolved and the code does not reappear.

Cost to Fix P1635 2001 Ford F150

The cost of repairing a P1635 code on a 2001 Ford F150 can vary depending on the specific cause of the issue. In general, the cost of parts for this repair can range from $50 to $200, while labor costs can range from $100 to $300. Overall, the total repair cost could be anywhere from $150 to $500. It's important to note that these are rough estimates, and actual costs may vary based on the location, vehicle make and model, and the rates charged by the auto repair shop. It's recommended to obtain quotes from multiple shops to ensure a competitive price for the repair.

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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.

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