AutoCodes – Generic – U1254

U1254 Code - Invalid Or Missing Data For Network Control

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Module that is not communicating, Module harness is open or shorted, 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: U1254 indicates Invalid Or Missing Data For Network Control.
Common causes: Common causes include Faulty Module that is not communicating, Module harness is open or shorted, 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 5,096

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 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1254 Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for State of Health monitoring. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an identification number with at least one critical parameter within 5 seconds of beginning serial data communication, the Diagnostic Trouble Code (DTC) is set.

OBDII Code U1254 - Invalid Or Missing Data For Network Control - AutoCodes.com — U1254 Code - Invalid Or Missing Data For Network Control

What does this mean?

What are the Possible Causes of the DTC U1254?

Faulty Module that is not communicating
Module harness is open or shorted
Module circuit poor electrical connection

How to Fix the DTC U1254?

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 U1254 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 U1254 code?

Need more information on how to fix the U1254 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1254 code diagnosed by a professional: Find a repair shop in your area

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 U1254 Code

1. What are the common symptoms of OBDII code U1254?

The common symptoms of U1254 include issues with network communication, such as intermittent or complete loss of communication between control modules in the vehicle.

2. What are some possible causes of OBDII code U1254?

Possible causes of U1254 include damaged wiring or connectors, faulty control modules, software issues, or a problem with the network communication bus.

3. How can I diagnose OBDII code U1254?

Diagnosing U1254 typically involves using a professional diagnostic scanner to read the code and check for any related codes. It may also require inspecting the wiring, connectors, and control modules for any visible damage.

4. Can I drive my vehicle with OBDII code U1254?

It is generally not recommended to drive your vehicle with U1254 present, as it can indicate underlying network communication issues that may affect the vehicle's performance and safety.

5. How do I repair OBDII code U1254?

Repairing U1254 involves identifying and addressing the root cause of the communication issue. This may include repairing or replacing damaged wiring, connectors, or control modules, as well as updating software or resetting the network communication system.

6. Is OBDII code U1254 a serious issue?

While U1254 itself may not directly affect the drivability of the vehicle, it is important to address the underlying communication problem to prevent potential issues with other control modules and systems in the vehicle.

7. Can a DIY enthusiast fix OBDII code U1254?

Diagnosing and repairing U1254 may require advanced diagnostic tools and technical knowledge, so it is recommended to consult a professional mechanic or technician for assistance.

8. How much does it cost to repair OBDII code U1254?

The cost of repairing U1254 can vary depending on the underlying cause of the issue and the specific repairs needed. It is best to obtain a diagnosis from a mechanic to determine the exact cost.

9. Will resetting the OBDII code U1254 make it go away permanently?

Simply resetting the code may temporarily clear the fault, but if the underlying issue causing U1254 is not addressed, the code is likely to reappear.

10. How often does OBDII code U1254 occur in vehicles?

U1254 is a relatively uncommon OBDII code, but it can occur in vehicles with network communication systems, especially in newer vehicles with advanced electronic control modules.