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P1635 Lincoln Code - Tire / Axle Ratio Out of Acceptable Range

Quick Answer

The P1635 diagnostic trouble code (DTC) for Lincoln vehicles indicates that the tire or axle ratio is out of an acceptable range. Common causes include Faulty wheel speed sensor, Damaged tone ring, Incorrect tire size or pressure. 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 Lincoln indicates Tire / Axle Ratio Out of Acceptable Range.
Common causes
Common causes include Faulty wheel speed sensor, Damaged tone ring, Incorrect tire size or pressure.
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 10, 2024
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Code P1635 Lincoln Description

The P1635 diagnostic trouble code (DTC) for Lincoln vehicles indicates that the tire or axle ratio is out of an acceptable range. This code is related to the vehicle's anti-lock braking system (ABS) and traction control system, as these systems rely on accurate wheel speed data to function properly. When the tire or axle ratio is not within the acceptable range, it can lead to incorrect wheel speed readings, which may result in impaired ABS and traction control functionality.

OBDII Code P1635 Lincoln - Tire / Axle Ratio Out of Acceptable Range
P1635 Lincoln Code - Tire / Axle Ratio Out of Acceptable Range

Common Causes of P1635 Lincoln

  1. Faulty wheel speed sensor
  2. Damaged tone ring
  3. Incorrect tire size or pressure
  4. Malfunctioning ABS module
  5. Issues with the vehicle's differential

Symptoms of P1635 Lincoln

  1. ABS warning light illuminated on the dashboard
  2. Traction control system malfunction indicator
  3. Inconsistent or erratic braking performance
  4. Increased stopping distance
  5. Tires wearing unevenly

How to Fix P1635 Lincoln

  1. Perform a comprehensive diagnostic scan to retrieve the specific wheel speed sensor causing the issue.
  2. Inspect the tone ring for any damage and replace if necessary.
  3. Verify that the tires are of the correct size and inflated to the manufacturer's specifications.
  4. Test the ABS module for proper functionality and replace if defective.
  5. Inspect the differential for any issues that may be affecting the axle ratio and address accordingly.

Cost to Fix P1635 Lincoln

The typical repair costs for resolving a P1635 code related to the tire or axle ratio can vary depending on the specific cause of the issue. On average, the repair cost may range from $200 to $500, including parts and labor. However, it is important to note that the actual cost can be higher or lower based on factors such as the severity of the problem, the vehicle's make and model, and the labor rates at the auto repair shop. It is advisable to consult with a qualified mechanic for a more accurate estimate based on the individual circumstances of the vehicle in question.

What does this mean?

Tech Notes for P1635 Lincoln

On some Lincoln 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 following Lincoln models:

2017-2019 Lincoln Continental

2008 Lincoln Mark LT

2015-2019 Lincoln MKC

2009-2016 Lincoln MKS

2010-2019 Lincoln MKT

2008-2018 Lincoln MKX

2008-2019 Lincoln MKZ

2019 Lincoln Nautilus

2008-2019 Lincoln Navigator

2008-2011 Lincoln Town Car

Lincoln Factory Service Bulletin OBDII Code P1635



There is a Factory Service Bulletin for some 1999-2022 Lincoln models:

Lincoln Factory Service Bulletin OBDII Code P1635

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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.

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