AutoCodes – Generic – U1403

U1403 Code - Implausible Fuel Level Signal Received

Quick Answer

The Fuel Level Sensor signal is a direct input to the Body Control Module (BCM). Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain 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: U1403 indicates Implausible Fuel Level Signal Received.
Common causes: Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 13,670

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 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U1403 Description

The Fuel Level Sensor signal is a direct input to the Body Control Module (BCM). The BCM transmits the fuel level message to the Powertrain Control Module (PCM) over the Controller Area Network (CAN) C bus. The Diagnostic Trouble Code (DTC) sets when the fuel level message that the Powertrain Control Module (PCM) is receiving is implausible. The circuit is continuously monitored.

OBDII Code U1403 - Implausible Fuel Level Signal Received - AutoCodes.com — U1403 Code - Implausible Fuel Level Signal Received

What does this mean?

What are the Possible Causes of the DTC U1403?

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

How to Fix the DTC U1403?

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 U1403 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 U1403 code?

Need more information on how to fix the U1403 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1403 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1403 Chrysler — Implausible Fuel Level Signal Received
U1403 Dodge — Implausible Fuel Level Signal Received
U1403 Jeep — Implausible Fuel Level Signal Received
U1403 RAM — Implausible Fuel Level 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 U1403 Code

1. What does the OBDII code U1403 indicate?

The code U1403 signifies that the vehicle's onboard diagnostic system has detected an implausible fuel level signal being received.

2. What are common symptoms of the U1403 code?

Common symptoms of U1403 may include inaccurate fuel level readings on the dashboard, fluctuating fuel gauge readings, and the illumination of the check engine light.

3. What are possible causes of the U1403 code?

Potential causes of the U1403 code include a faulty fuel level sensor, wiring issues in the fuel level sensor circuit, a malfunctioning instrument cluster, or a problem with the powertrain control module (PCM).

4. How can I diagnose the U1403 code?

Diagnosing the U1403 code typically involves using a diagnostic scanner to retrieve the code, inspecting the fuel level sensor and its wiring for any visible damage, and testing the sensor's resistance and voltage output.

5. How can I repair the U1403 code?

Repairing the U1403 code may involve replacing the faulty fuel level sensor, repairing any damaged wiring in the sensor circuit, resetting the PCM, or recalibrating the fuel level sensor using a scan tool.

6. Can driving with the U1403 code present cause any further damage?

Continuing to drive with the U1403 code present may not cause immediate harm to the vehicle, but it can lead to inaccurate fuel level readings, which may impact fuel efficiency and potentially leave you stranded if the fuel level is not accurately displayed.

7. Is it safe to ignore the U1403 code?

While ignoring the U1403 code may not pose an immediate safety risk, it is recommended to address the issue promptly to ensure accurate fuel level readings and prevent any potential future problems related to the fuel system.

8. Can a DIY enthusiast fix the U1403 code at home?

Depending on your level of automotive knowledge and experience, you may be able to troubleshoot and repair the U1403 code at home. However, if you are unfamiliar with diagnosing electrical issues or working on the fuel system, it may be best to seek professional help.

9. How much does it cost to repair the U1403 code?

The cost of repairing the U1403 code can vary depending on the underlying cause of the issue, the parts needed for repair, and whether you choose to do the repair yourself or take your vehicle to a mechanic. It's advisable to obtain quotes from local repair shops for an accurate estimate.

10. Can the U1403 code reappear after being cleared?

Yes, the U1403 code can reappear if the underlying issue has not been properly addressed. It's crucial to diagnose the root cause of the problem and complete the necessary repairs to prevent the code from returning.