U1403 Code - Implausible Fuel Level Signal Received
Quick Answer
The U1403 diagnostic trouble code (DTC) indicates that an implausible fuel level signal has been received by the vehicle's engine control module (ECM). Common causes include Faulty fuel level sensor, Wiring or connector issues, Corrosion or contamination in the fuel tank. 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 fuel level sensor, Wiring or connector issues, Corrosion or contamination in the fuel tank.
- 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 U1403 Description
The U1403 diagnostic trouble code (DTC) indicates that an implausible fuel level signal has been received by the vehicle's engine control module (ECM). This means that the ECM has detected a discrepancy between the expected fuel level and the actual fuel level in the vehicle's fuel tank. The fuel level sensor is responsible for sending this information to the ECM, which then uses it to calculate fuel consumption, optimize fuel delivery, and accurately display the fuel level on the dashboard.
Common Causes of U1403
- Faulty fuel level sensor
- Wiring or connector issues
- Corrosion or contamination in the fuel tank
- ECM software malfunction
- Fuel pump or fuel system issues
Symptoms of U1403
- Inaccurate fuel level readings on the dashboard
- Check engine light illuminated
- Engine running rich or lean
- Fluctuating fuel gauge readings
- Difficulty starting the vehicle
How to Fix U1403
- Diagnose the issue by using a scan tool to retrieve the DTC and testing the fuel level sensor's resistance.
- Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as needed.
- Clean or replace the fuel level sensor in the fuel tank.
- Clear the DTC from the ECM's memory and reset the fuel level readings.
- Test drive the vehicle to confirm the repair and ensure the fuel level readings are accurate.
Cost to Fix U1403
The cost of repairing an implausible fuel level signal issue can vary depending on the specific cause of the problem. In general, you can expect to pay anywhere from $100 to $300 for parts and labor. Keep in mind that diagnostic time and labor rates can vary, so it's best to check with local auto repair shops for a more precise estimate based on your location and vehicle type.
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Code U1403 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
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.
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