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U1505 RAM Code - Implausible Message Data Length Received From FDCM

Quick Answer

The U1505 diagnostic trouble code (DTC) indicates that the Body Control Module (BCM) has received an implausible message data length from the Final Drive Control Module (FDCM). Common causes include Loose or corroded wiring connections between the BCM and FDCM, Damaged wiring harnesses affecting communication between modules, Faulty BCM or FDCM components. 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 RAM indicates Implausible Message Data Length Received From FDCM.
Common causes
Common causes include Loose or corroded wiring connections between the BCM and FDCM, Damaged wiring harnesses affecting communication between modules, Faulty BCM or FDCM components.
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 16, 2024
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Code U1505 RAM Description

The U1505 diagnostic trouble code (DTC) indicates that the Body Control Module (BCM) has received an implausible message data length from the Final Drive Control Module (FDCM). The FDCM is responsible for controlling the vehicle's four-wheel-drive system, including engaging and disengaging the transfer case and managing power distribution to the front and rear wheels. When the BCM receives data from the FDCM that has an incorrect or unexpected length, it can lead to communication errors between these modules.

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

Common Causes of U1505 RAM

  1. Loose or corroded wiring connections between the BCM and FDCM.
  2. Damaged wiring harnesses affecting communication between modules.
  3. Faulty BCM or FDCM components.
  4. Software glitches or programming errors in the modules.
  5. Water intrusion or moisture affecting electrical connections.

Symptoms of U1505 RAM

  1. Four-wheel-drive system not engaging or disengaging properly.
  2. Dashboard warning lights related to the four-wheel-drive system.
  3. Inconsistent power distribution between front and rear wheels.
  4. Unusual noises or vibrations when driving in four-wheel-drive mode.
  5. Loss of traction or stability in slippery or off-road conditions.

How to Fix U1505 RAM

  1. Begin by conducting a thorough visual inspection of the wiring harnesses and connections between the BCM and FDCM.
  2. Use a multimeter to test the continuity and resistance of the wiring to identify any damaged or faulty wires.
  3. Check for any software updates or reprogramming available for the BCM and FDCM to address potential programming errors.
  4. If no issues are found with the wiring or software, consider replacing the BCM or FDCM if they are determined to be faulty.
  5. After completing the repair, clear the DTC and test the four-wheel-drive system to ensure proper operation.

Cost to Fix U1505 RAM

The typical repair costs for addressing the U1505 code can vary depending on the specific cause of the issue. In general, replacing wiring harnesses or repairing wiring connections may cost between $100 to $300, while replacing a faulty BCM or FDCM can range from $500 to $1000 or more, including parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your vehicle make and model.

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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 RAM Code

1. What are the common symptoms of OBDII code U1505 RAM?

- Common symptoms of code U1505 RAM may include issues with the Four-Wheel Drive Control Module (FDCM), warning lights on the dashboard, and limited functionality of the 4WD system.

2. What could cause the OBDII code U1505 RAM to trigger?

- The U1505 code is triggered when the Powertrain Control Module (PCM) detects an implausible message data length received from the Four-Wheel Drive Control Module (FDCM).

3. How serious is the U1505 RAM code in a vehicle?

- The U1505 code can affect the proper operation of the Four-Wheel Drive system in the vehicle, potentially leading to issues with traction and stability in certain driving conditions.

4. What are some possible repair tips for fixing the U1505 RAM code?

- Repair tips may include checking the wiring and connectors between the PCM and FDCM, ensuring proper voltage supply to the modules, and reprogramming or replacing the FDCM if necessary.

5. Can I drive my vehicle with the U1505 RAM code present?

- It is not recommended to drive the vehicle with the U1505 code present, as it can impact the performance and safety of the Four-Wheel Drive system.

6. How can I diagnose the U1505 RAM code in my vehicle?

- Diagnosing the U1505 code typically involves using a diagnostic scanner to retrieve the code, checking for other related codes, and performing a thorough inspection of the 4WD system components.

7. Is the U1505 RAM code a common issue in certain vehicle makes and models?

- The U1505 code may be more common in vehicles equipped with Four-Wheel Drive systems and specific models that use similar PCM and FDCM configurations.

8. Can resetting the PCM clear the U1505 RAM code?

- Resetting the PCM may temporarily clear the code, but it is important to address the underlying issue causing the code to prevent it from reoccurring.

9. Are there any recalls related to the U1505 RAM code?

- It is recommended to check with the vehicle manufacturer or a dealership to see if there are any recalls related to the U1505 code for your specific vehicle make and model.

10. How much does it typically cost to repair the U1505 RAM code?

- The cost of repairing the U1505 code can vary depending on the underlying issue, but it may involve replacement parts, labor costs, and diagnostic fees.

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