AutoCodes – Generic – U1131

U1131 Code - Invalid Or Missing Data For Fuel System

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: U1131 indicates Invalid Or Missing Data For Fuel System.
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 11,480

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 Apr 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1131 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 U1131 - Invalid Or Missing Data For Fuel System - AutoCodes.com — U1131 Code - Invalid Or Missing Data For Fuel System

What does this mean?

What are the Possible Causes of the DTC U1131?

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

How to Fix the DTC U1131?

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 U1131 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 U1131 code?

Need more information on how to fix the U1131 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1131 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 U1131 Code

1. What are the common symptoms of OBDII code U1131 (Invalid or Missing Data for Fuel System)?

- Common symptoms include poor fuel economy, rough idling, stalling, and a noticeable decrease in engine performance.

2. What are some possible causes of OBDII code U1131?

- Possible causes include a faulty fuel pressure sensor, issues with the fuel pump, wiring problems, or a malfunctioning engine control module (ECM).

3. How can I diagnose the cause of OBDII code U1131?

- Diagnosing the issue typically involves using a diagnostic scanner to retrieve the code, checking the fuel system components for any visible damage, and testing the sensors and wiring for proper functionality.

4. Can driving with OBDII code U1131 cause further damage to my vehicle?

- Continuing to drive with this code may lead to poor engine performance and potentially damage the fuel system components over time. It's recommended to address the issue promptly.

5. What are some repair tips for fixing OBDII code U1131?

- Repair tips may include checking and replacing the fuel pressure sensor, inspecting the fuel pump for proper operation, ensuring all wiring connections are secure, and clearing the code to see if it returns after repairs.

6. Is it safe to continue driving my vehicle with OBDII code U1131?

- While the vehicle may still be operable with this code, it's best to address the underlying issue as soon as possible to prevent any further damage and maintain optimal performance.

7. How much does it typically cost to repair OBDII code U1131?

- The cost of repair can vary depending on the exact cause of the code and the labor rates in your area. It's best to consult with a professional mechanic for a more accurate estimate.

8. Can I reset OBDII code U1131 myself, or do I need a professional to do it?

- You can attempt to reset the code yourself using an OBDII scanner, but if the issue is not resolved, it's recommended to seek the expertise of a professional mechanic for proper diagnosis and repair.

9. Are there any preventative measures I can take to avoid OBDII code U1131 in the future?

- Regular maintenance of the fuel system components, such as checking for leaks, ensuring proper fuel pressure, and keeping up with recommended service intervals, can help prevent issues that may trigger this code.

10. How long does it typically take to repair OBDII code U1131?

- The repair time can vary depending on the cause of the code and the complexity of the repair needed. It can range from a quick sensor replacement to a more involved diagnostic process.