OBD Guide
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U1403

Implausible Fuel Level Signal Received

U1403 is an OBD-II diagnostic trouble code meaning: Implausible Fuel Level Signal Received. Common causes: faulty fuel level sensor, open or short circuit in the sensor circuit. Estimated repair cost: $17–56.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Incorrect fuel level display
  • Flashing or lit fuel level indicator
  • Errors in calculating remaining mileage
  • Incorrect operation of the fuel level indicator

Causes

  • Faulty fuel level sensor
  • Open or short circuit in the sensor circuit
  • Poor contacts or corrosion in connectors
  • Problems with the fuel tank control module
  • ECU malfunction

How to Fix

  1. Check the condition of the fuel level sensor circuit
  2. Check sensor connectors for corrosion or damage.
  3. Test the fuel level sensor
  4. Check sensor circuit resistance
  5. If necessary, replace the fuel level sensor

Related codes

U1401U1402U1404

FAQ

What does the U1403 code mean?

U1403 is an OBD-II diagnostic trouble code that indicates: Implausible Fuel Level Signal Received

What causes a U1403 error code?

The most common causes of U1403 include: Faulty fuel level sensor; Open or short circuit in the sensor circuit; Poor contacts or corrosion in connectors; Problems with the fuel tank control module.

How do I fix a U1403 diagnostic trouble code?

To fix U1403: Check the condition of the fuel level sensor circuit. Check sensor connectors for corrosion or damage.. Test the fuel level sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1403?

Yes, but get it checked soon

How much does it cost to fix U1403?

The estimated repair cost for U1403 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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