AutoCodes – Generic – U1491

U1491 Code - Implausible Fuel Level 2 Signal Received

Quick Answer

The Diagnostic Trouble Code (DTC) will set if the Module receives an implausible or Signal Not Available (SNA) fuel level message from the Body Control Module (BCM). Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body 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: U1491 indicates Implausible Fuel Level 2 Signal Received.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body 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 645

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 U1491 Description

The Diagnostic Trouble Code (DTC) will set if the Module receives an implausible or Signal Not Available (SNA) fuel level message from the Body Control Module (BCM).

OBDII Code U1491 - Implausible Fuel Level 2 Signal Received - AutoCodes.com — U1491 Code - Implausible Fuel Level 2 Signal Received

What does this mean?

What are the Possible Causes of the DTC U1491?

Faulty Body Control Module (BCM)
Body Control Module harness is open or shorted
Body Control Module circuit poor electrical connection
Faulty Instrument Cluster

How to Fix the DTC U1491?

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 U1491 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 U1491 code?

Need more information on how to fix the U1491 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1491 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1491 Chrysler — Implausible Fuel Level 2 Signal Received
U1491 Dodge — Implausible Fuel Level 2 Signal Received
U1491 Jeep — Implausible Fuel Level 2 Signal Received
U1491 RAM — Implausible Fuel Level 2 Signal Received

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 U1491 Code

What does the OBDII code U1491 mean?

U1491 indicates an "Implausible Fuel Level 2 Signal Received," meaning the engine control module (ECM) has detected an inconsistency or error in the fuel level sensor readings.

What are the common symptoms of the U1491 code?

Common symptoms include inaccurate fuel gauge readings, warning lights on the dashboard, and potential issues with fuel-related performance, such as stalling or poor fuel efficiency.

What could cause the U1491 code to trigger?

Causes can include a faulty fuel level sensor, damaged wiring or connectors, issues with the ECM, or problems with the fuel tank itself.

How can I diagnose the U1491 code?

Start by checking the fuel level sensor and its wiring for damage or loose connections. Use a multimeter to test the sensor's resistance and compare it to the manufacturer's specifications.

Can I drive my vehicle with the U1491 code?

While it may be possible to drive with this code, it's not recommended, as it may lead to poor fuel management and performance issues.

What are some common repairs for the U1491 code?

Common repairs include replacing the faulty fuel level sensor, repairing or replacing damaged wiring or connectors, and reprogramming or replacing the ECM if necessary.

How can I clear the U1491 code after repairs?

You can clear the code using an OBD-II scanner. After making repairs, disconnect the battery for a few minutes or use the scanner to reset the check engine light.

Should I replace the fuel level sensor if the U1491 code appears?

Not necessarily; first, conduct a thorough diagnosis to rule out wiring issues or ECM faults before replacing the fuel level sensor.

How can I prevent the U1491 code from reappearing?

Regular maintenance and inspections of the fuel system, including the fuel level sensor and wiring, can help prevent issues that may trigger the U1491 code.