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Engine-Codes – Ford – P1635 2006 Ford Fusion

P1635 2006 Ford Fusion Code - Tire / Axle Ratio Out of Acceptable Range

Quick Answer

The P1635 diagnostic trouble code (DTC) in a 2006 Ford Fusion indicates that the tire or axle ratio is outside the acceptable range set by the vehicle's manufacturer. Common causes include Incorrect tire size installed on the vehicle, Aftermarket modifications affecting the axle ratio, 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 2006 Ford Fusion indicates Tire / Axle Ratio Out of Acceptable Range.
Common causes
Common causes include Incorrect tire size installed on the vehicle, Aftermarket modifications affecting the axle ratio, 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 15, 2024
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Code P1635 2006 Ford Fusion Description

The P1635 diagnostic trouble code (DTC) in a 2006 Ford Fusion indicates that the tire or axle ratio is outside the acceptable range set by the vehicle's manufacturer. 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 for the vehicle's electronic stability control (ESC) system, traction control system, and anti-lock braking system (ABS) to function properly.

OBDII Code P1635 2006 Ford Fusion - Tire / Axle Ratio Out of Acceptable Range
P1635 2006 Ford Fusion Code - Tire / Axle Ratio Out of Acceptable Range

Common Causes of P1635 2006 Ford Fusion

  1. Incorrect tire size installed on the vehicle.
  2. Aftermarket modifications affecting the axle ratio.
  3. Faulty wheel speed sensors.
  4. Wiring issues or sensor malfunctions.
  5. ECM (Engine Control Module) software glitches.

Symptoms of P1635 2006 Ford Fusion

  1. Illumination of the ABS or traction control warning lights on the dashboard.
  2. Inaccurate speedometer readings or fluctuations in speed readings.
  3. Decreased fuel efficiency.
  4. Unusual noises coming from the drivetrain.
  5. Difficulty shifting gears or abnormal transmission behavior.

How to Fix P1635 2006 Ford Fusion

  1. Verify the correct tire size and axle ratio specified for the vehicle in the owner's manual or on the driver's side door jamb.
  2. Inspect the tires to ensure they match the recommended size and check the axle ratio for any modifications.
  3. Test the wheel speed sensors using a diagnostic scan tool to identify any faulty sensors.
  4. Check the wiring harness and connectors for any damage or corrosion.
  5. Update the ECM software if necessary to recalibrate the tire or axle ratio settings.

Cost to Fix P1635 2006 Ford Fusion

The typical repair costs for addressing the P1635 code in a 2006 Ford Fusion can range from $100 to $500, depending on the specific cause of the issue and the required repairs. This estimate includes parts and labor. However, it is essential to note that diagnosis time and labor rates at auto repair shops can vary significantly. Rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It is advisable to obtain quotes from multiple sources to determine the most cost-effective solution for resolving this issue.

What does this mean?

Tech Notes for P1635 2006 Ford Fusion

On some Ford 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 2006 Ford Fusion

2006 Ford Fusion Factory Service Bulletin OBDII Code P1635

Need more information about the P1635 2006 Ford Fusion code?

Need more information on how to fix the P1635 2006 Ford Fusion code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1635 2006 Ford Fusion 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 2006 Ford Fusion Code

1. What are the common symptoms of OBDII code P1635 in a 2006 Ford Fusion?

The common symptoms include illuminated Check Engine Light, traction control system issues, and potential difficulties with shifting gears.

2. What does the OBDII code P1635 "Tire / Axle Ratio Out of Acceptable Range" mean for a 2006 Ford Fusion?

It indicates that the vehicle's onboard computer has detected a discrepancy between the expected tire size or axle ratio and the actual values being reported.

3. What are the possible causes of OBDII code P1635 in a 2006 Ford Fusion?

Potential causes include incorrect tire size, axle ratio changes, faulty wheel speed sensors, damaged wiring, or issues with the ABS module.

4. How can I diagnose the OBDII code P1635 in my 2006 Ford Fusion?

Diagnosis typically involves checking the tire sizes, axle ratios, wheel speed sensor readings, and inspecting the wiring and connections related to the ABS system.

5. Can driving with OBDII code P1635 in a 2006 Ford Fusion cause further damage?

Continued driving with this code may lead to inaccurate speedometer readings, traction control malfunctions, and potential strain on the transmission due to incorrect axle ratio data.

6. How can I reset the OBDII code P1635 in my 2006 Ford Fusion?

Resetting the code can be done using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes. However, it is important to address the underlying issue causing the code to prevent it from reoccurring.

7. Is it safe to continue driving my 2006 Ford Fusion with OBDII code P1635?

It is not recommended to drive the vehicle with this code present, as it may affect the performance and safety systems of the car. It is advisable to address the issue promptly.

8. Will fixing the tire or axle ratio resolve OBDII code P1635 in my 2006 Ford Fusion?

Correcting the tire size or axle ratio to match the manufacturer's specifications is a crucial step in resolving this code. However, additional diagnostics may be needed if the issue persists.

9. Can a DIY enthusiast repair OBDII code P1635 in a 2006 Ford Fusion?

Depending on the cause, DIY enthusiasts may be able to address this issue by checking and adjusting the tire size or axle ratio. However, complex electrical or sensor-related problems may require professional assistance.

10. How much does it typically cost to repair OBDII code P1635 in a 2006 Ford Fusion?

The cost of repair can vary depending on the root cause of the issue. Simple fixes like correcting tire size may be relatively inexpensive, while more complex problems involving sensors or wiring could be more costly.

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