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U1505 Dodge Code - Implausible Message Data Length Received From FDCM

Quick Answer

The U1505 diagnostic trouble code (DTC) for Dodge vehicles refers to an "Implausible Message Data Length Received From FDCM." This code indicates that the communication between the Final Drive Control Module (FDCM) and the vehicle's onboard computer system is experiencing issues. Common causes include Faulty wiring or connectors in the communication network between the FDCM and the vehicle's computer, Malfunctioning FDCM module, Corrosion or damage to the electrical connections related to the four-wheel-drive system. 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
U1505 Dodge indicates Implausible Message Data Length Received From FDCM.
Common causes
Common causes include Faulty wiring or connectors in the communication network between the FDCM and the vehicle's computer, Malfunctioning FDCM module, Corrosion or damage to the electrical connections related to the four-wheel-drive system.
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 18, 2024
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Code U1505 Dodge Description

The U1505 diagnostic trouble code (DTC) for Dodge vehicles refers to an "Implausible Message Data Length Received From FDCM." This code indicates that the communication between the Final Drive Control Module (FDCM) and the vehicle's onboard computer system is experiencing issues. The FDCM is responsible for controlling various functions related to the vehicle's four-wheel-drive system, such as engaging/disengaging the transfer case, managing traction control, and coordinating power distribution to the wheels.

OBDII Code U1505 Dodge - Implausible Message Data Length Received From FDCM
U1505 Dodge Code - Implausible Message Data Length Received From FDCM

Common Causes of U1505 Dodge

  1. Faulty wiring or connectors in the communication network between the FDCM and the vehicle's computer.
  2. Malfunctioning FDCM module.
  3. Corrosion or damage to the electrical connections related to the four-wheel-drive system.
  4. Software glitches or communication protocol errors within the vehicle's computer system.
  5. Environmental factors such as moisture or debris affecting the components.

Symptoms of U1505 Dodge

  1. Illumination of the four-wheel-drive warning light on the dashboard.
  2. Inability to engage or disengage the four-wheel-drive system.
  3. Erratic behavior of the traction control system.
  4. Loss of stability or traction while driving on slippery surfaces.
  5. Reduced fuel efficiency due to improper power distribution to the wheels.

How to Fix U1505 Dodge

  1. Begin by conducting a thorough visual inspection of the wiring, connectors, and components associated with the FDCM and the communication network.
  2. Use a diagnostic scan tool to retrieve the specific trouble codes and data related to the U1505 error.
  3. Test the FDCM module for proper functionality and communication with the vehicle's computer.
  4. Check for any software updates or reprogramming procedures recommended by the manufacturer to address communication issues.
  5. Repair or replace any damaged wiring, connectors, or components as needed to restore proper communication between the FDCM and the vehicle's computer.

Cost to Fix U1505 Dodge

The typical repair costs for addressing the U1505 code can vary depending on the extent of the issue, the specific components that require repair or replacement, and the labor rates at the auto repair shop. In general, resolving communication errors between the FDCM and the vehicle's computer may range from $200 to $500, including parts and labor. However, it's important to note that diagnosis time and labor rates can vary significantly based on factors such as location, vehicle make and model, and the expertise of the technicians. It's advisable to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on your specific circumstances.

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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 U1505 Dodge Code

1. What does the OBDII code U1505 for Dodge mean?

The code U1505 indicates an "Implausible Message Data Length Received From FDCM" error in the Dodge's onboard diagnostics system.

2. What are the common symptoms of the U1505 code in a Dodge?

Common symptoms of the U1505 code may include issues with the 4WD system, traction control system, ABS system, or other related systems in the vehicle.

3. What are possible causes of the U1505 code in a Dodge?

Possible causes of the U1505 code include faulty wiring, a malfunctioning FDCM (Final Drive Control Module), a communication error between modules, or a software glitch.

4. How can I diagnose the U1505 code in my Dodge?

Diagnosing the U1505 code typically involves using an OBDII scanner to retrieve the code, checking for any other related codes, inspecting the wiring and connections, and testing the FDCM and other relevant modules.

5. How serious is the U1505 code in a Dodge?

The U1505 code may affect the proper functioning of various vehicle systems, such as the 4WD and traction control, so it is important to address this issue promptly to prevent further complications.

6. Can I drive my Dodge with the U1505 code?

It is not recommended to drive your Dodge with the U1505 code present, as it may lead to safety and performance issues. It's best to have the vehicle inspected and repaired as soon as possible.

7. How do I repair the U1505 code in my Dodge?

Repairing the U1505 code typically involves fixing any wiring issues, replacing a faulty FDCM if necessary, ensuring proper communication between modules, and clearing the code with a diagnostic tool.

8. Will resetting the U1505 code make it go away permanently?

Simply resetting the code may temporarily clear the warning, but if the underlying issue causing the U1505 code is not addressed, it is likely to reappear. It's important to diagnose and fix the root cause of the problem.

9. Does the U1505 code affect fuel economy in a Dodge?

While the U1505 code itself may not directly impact fuel economy, if it leads to issues with the vehicle's traction control or 4WD system, it could affect overall performance, which in turn may impact fuel efficiency.

10. Can a DIY enthusiast fix the U1505 code in a Dodge?

Depending on the skill level and experience of the individual, some DIY enthusiasts may be able to address wiring issues or module replacements related to the U1505 code. However, complex diagnostics and repairs may require professional assistance.

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