AutoCodes – Generic – U1505

U1505 Code - Implausible Message Data Length Received From FDCM

Quick Answer

The messages sent on the Controller Area Network (CAN) bus are distinguished by an Identifier (ID). Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection. 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 Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection.
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.

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Code Popularity 3,129

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 31, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1505 Description

The messages sent on the Controller Area Network (CAN) bus are distinguished by an Identifier (ID). Each CAN ID is defined to contain a certain number of bytes. The Transmission Control Module (TCM) verifies that it has received the proper number of bytes for each ID.

OBDII Code U1505 - Implausible Message Data Length Received From FDCM - AutoCodes.com — U1505 Code - Implausible Message Data Length Received From FDCM

What does this mean?

What are the Possible Causes of the DTC U1505?

Faulty Transmission Control Module (TCM)
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC U1505?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1505 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U1505 code?

Need more information on how to fix the U1505 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1505 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1505 Buick — Local Interconnect Network Bus Failure
U1505 Cadillac — Local Interconnect Network Bus Failure
U1505 Chevrolet — Local Interconnect Network Bus Failure
U1505 Chrysler — Implausible Message Data Length Received From FDCM
U1505 Dodge — Implausible Message Data Length Received From FDCM
U1505 GMC — Local Interconnect Network Bus Failure
U1505 Jeep — Implausible Message Data Length Received From FDCM
U1505 RAM — Implausible Message Data Length Received From FDCM

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.