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Engine-Codes – Generic – U1505

U1505 Code - Implausible Message Data Length Received From FDCM

Quick Answer

The U1505 diagnostic trouble code indicates that there is an issue with the length of the message data received from the Final Drive Control Module (FDCM) in the vehicle. Common causes include Wiring harness issues such as breaks, shorts, or corrosion, Faulty sensors or connectors related to the FDCM, Malfunctioning FDCM unit. 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 indicates Implausible Message Data Length Received From FDCM.
Common causes
Common causes include Wiring harness issues such as breaks, shorts, or corrosion, Faulty sensors or connectors related to the FDCM, Malfunctioning FDCM unit.
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 U1505 Description

The U1505 diagnostic trouble code indicates that there is an issue with the length of the message data received from the Final Drive Control Module (FDCM) in the vehicle. The FDCM is responsible for controlling the transfer case in four-wheel-drive vehicles, managing power distribution between the front and rear axles to optimize traction and stability. When the FDCM sends data to the vehicle's main computer, the length of the message data is expected to fall within a specific range. If the data length is deemed implausible, the U1505 code is triggered, indicating a communication error between the FDCM and the main computer.

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

Common Causes of U1505

  1. Wiring harness issues such as breaks, shorts, or corrosion.
  2. Faulty sensors or connectors related to the FDCM.
  3. Malfunctioning FDCM unit.
  4. Communication network problems between modules.
  5. Software glitches in the vehicle's main computer.

Symptoms of U1505

  1. Illumination of the four-wheel-drive warning light on the dashboard.
  2. Difficulty engaging or disengaging the four-wheel-drive system.
  3. Loss of traction control or stability control functionality.
  4. Erratic behavior of the transfer case when switching between drive modes.
  5. Reduced fuel efficiency due to the system operating outside optimal parameters.

How to Fix U1505

  1. Begin by diagnosing the issue using a professional diagnostic scanner to retrieve the specific error codes and pinpoint the source of the problem.
  2. Inspect the wiring harness and connectors for any signs of damage or corrosion. Repair or replace as necessary.
  3. Test the sensors related to the FDCM for proper functionality and replace any faulty components.
  4. Check the communication network between modules for disruptions and address any connectivity issues.
  5. Reset the error codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix U1505

The cost of repairing a U1505 code can vary depending on the underlying cause of the issue. In general, expect to pay anywhere from $100 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can fluctuate based on location, vehicle make and model, and the complexity of the repair. It's recommended to seek quotes from multiple mechanics to find the best deal for your specific situation.

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Code U1505 Information for Specific Makes

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 Code

1. What does the OBDII code U1505 mean?

The code U1505 indicates an issue with the data length received from the Final Drive Control Module (FDCM) being implausible.

2. What are the common symptoms of OBDII code U1505?

Common symptoms may include erratic shifting, harsh transmission engagement, or the vehicle going into limp mode.

3. What are the possible causes of code U1505?

Possible causes of code U1505 include a faulty FDCM, damaged wiring or connectors, software issues, or communication network problems.

4. How can I diagnose the cause of OBDII code U1505?

Diagnosing code U1505 may involve checking the FDCM for proper operation, inspecting wiring and connectors for damage, and using a scan tool to analyze communication data.

5. Can I continue driving with OBDII code U1505 present?

It is not recommended to continue driving with code U1505 present, as it can lead to potential transmission issues and safety concerns.

6. How can I repair OBDII code U1505?

Repairing code U1505 may involve replacing a faulty FDCM, repairing damaged wiring or connectors, updating software, or addressing communication network issues.

7. Is it possible to reset OBDII code U1505 without repairs?

Resetting the code without addressing the underlying issue may temporarily clear the code, but it is likely to return if the root cause is not resolved.

8. Can a DIY enthusiast fix OBDII code U1505?

DIY enthusiasts with the necessary skills and tools may be able to diagnose and repair code U1505, but it is recommended to seek professional help for complex electrical and transmission issues.

9. How can I prevent OBDII code U1505 from occurring again?

Regular maintenance, proper handling of the vehicle's electrical system, and addressing any related warning signs promptly can help prevent code U1505 from reoccurring.

10. Are there any recalls related to OBDII code U1505?

Check with your vehicle manufacturer or the National Highway Traffic Safety Administration (NHTSA) to see if there are any recalls or technical service bulletins related to code U1505 for your specific vehicle model.

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