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U1439 Chrysler Code - Implausible/Missing Programmed Axle Ratio

Quick Answer

The U1439 Chrysler diagnostic trouble code (DTC) indicates an issue with the programmed axle ratio in the vehicle's electronic control module (ECM). Common causes include Faulty axle ratio sensor, Wiring or connection issues between the axle ratio sensor and ECM, ECM software glitch or programming error. 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
U1439 Chrysler indicates Implausible/Missing Programmed Axle Ratio.
Common causes
Common causes include Faulty axle ratio sensor, Wiring or connection issues between the axle ratio sensor and ECM, ECM software glitch or programming error.
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 U1439 Chrysler Description

The U1439 Chrysler diagnostic trouble code (DTC) indicates an issue with the programmed axle ratio in the vehicle's electronic control module (ECM). The axle ratio is a critical parameter that the ECM uses to calculate various functions such as fuel delivery, transmission shifting, and traction control. An implausible or missing programmed axle ratio can lead to incorrect calculations and adjustments by the ECM, resulting in poor vehicle performance, decreased fuel efficiency, and potential drivability issues.

OBDII Code U1439 Chrysler - Implausible/Missing Programmed Axle Ratio
U1439 Chrysler Code - Implausible/Missing Programmed Axle Ratio

Common Causes of U1439 Chrysler

  1. Faulty axle ratio sensor
  2. Wiring or connection issues between the axle ratio sensor and ECM
  3. ECM software glitch or programming error
  4. Mechanical damage to the axle or differential components
  5. Aftermarket modifications or upgrades affecting the axle ratio calibration

Symptoms of U1439 Chrysler

  1. Check engine light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Erratic shifting behavior from the transmission
  4. Reduced engine performance or power
  5. Traction control or stability control system malfunctions

How to Fix U1439 Chrysler

  1. Begin by using a diagnostic scan tool to retrieve the U1439 code and verify the issue.
  2. Inspect the wiring and connections between the axle ratio sensor and ECM for any damage or corrosion.
  3. Test the axle ratio sensor for proper functionality and replace if necessary.
  4. Update the ECM software to ensure the correct axle ratio is programmed.
  5. Clear the DTC and perform a test drive to confirm that the issue has been resolved.

Cost to Fix U1439 Chrysler

The typical repair costs for addressing a U1439 Chrysler code can vary depending on the specific cause of the issue. In general, replacing a faulty axle ratio sensor or repairing wiring connections may cost between $150 to $300, including parts and labor. However, if the ECM requires reprogramming or if there are additional mechanical issues with the axle components, the repair costs could increase significantly. It's recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on the vehicle's make and model, as well as any additional diagnostics or repairs that may be needed. Keep in mind that labor rates at auto repair shops can vary, so it's advisable to inquire about local rates before proceeding with 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 U1439 Chrysler Code

1. What does the OBDII code U1439 for Chrysler mean?

The U1439 code indicates an implausible or missing programmed axle ratio in the vehicle's computer system.

2. What are the common symptoms of U1439 code in a Chrysler vehicle?

Common symptoms may include incorrect speedometer readings, issues with the vehicle's transmission shifting, and illuminated warning lights on the dashboard.

3. What can cause the U1439 code to be triggered in a Chrysler car?

The U1439 code may be triggered due to a faulty wheel speed sensor, damaged wiring related to the axle ratio system, or a problem with the vehicle's computer module.

4. How serious is an U1439 fault code in a Chrysler vehicle?

While the U1439 code may not affect the drivability of the vehicle, it can lead to inaccurate data being sent to the vehicle's computer system, potentially causing performance issues.

5. How do I diagnose the U1439 code in my Chrysler car?

Diagnosing the U1439 code typically involves using a diagnostic scanner to retrieve the specific details of the fault code and conducting a thorough inspection of the axle ratio components.

6. Can I drive my Chrysler with the U1439 code present?

It is generally not recommended to drive the vehicle with the U1439 code present, as it can impact the accuracy of the vehicle's speed readings and transmission performance.

7. How can I repair the U1439 code in my Chrysler?

Repairing the U1439 code may involve replacing a faulty wheel speed sensor, repairing damaged wiring, or reprogramming the vehicle's computer system to correct the axle ratio data.

8. Will the U1439 code reset itself after repairs are completed?

After the necessary repairs have been made, the U1439 code can be cleared using a diagnostic scanner. If the underlying issue has been successfully resolved, the code should not reappear.

9. Can I fix the U1439 code in my Chrysler myself?

While some DIY enthusiasts may attempt to address the U1439 code, it is recommended to consult a professional mechanic with experience in diagnosing and repairing electronic control system faults.

10. How much does it cost to fix the U1439 code in a Chrysler vehicle?

The cost of fixing the U1439 code can vary depending on the specific cause of the issue, the required repairs, and labor costs. It is advisable to obtain quotes from different auto repair shops for an accurate estimate.

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