What Does P1431 Mean?
The fuel level sensor #2 signal is outside expected parameters or showing implausible readings. This indicates a problem with the secondary fuel level sending unit or its circuit, often in vehicles with dual saddle tanks or large fuel tanks.
Common Causes
40%
Failed fuel level sending unit #2 (float arm or resistor card)
25%
Corroded or damaged connector at fuel tank for sensor #2
20%
Open or shorted wiring between sensor #2 and instrument cluster/ECM
10%
Failed fuel pump module containing sensor #2
5%
Mechanical binding of float arm in fuel tank
Diagnostic Steps
1
Step 1: Monitor fuel level sensor #2 voltage or resistance values on scan tool during fuel slosh (rock vehicle)
2
Step 2: Access fuel tank connector and inspect for corrosion, water intrusion, or damaged pins
3
Step 3: Measure resistance of sensor #2 at tank connector, should vary smoothly from empty to full range (typically 0-90 ohms)
4
Step 4: Check wiring continuity between tank connector and ECM/instrument cluster
5
Step 5: If external checks pass, fuel tank removal may be required to inspect/replace sending unit
Estimated Repair Cost
$200 - $650
Parts + labor, varies by vehicle and location
The fuel level sensor #2 signal is outside expected parameters or showing implausible readings. This indicates a problem with the secondary fuel level sending unit or its circuit, often in vehicles with dual saddle tanks or large fuel tanks.
The most common cause of P1431 (Fuel Level Sensor 2 Performance) is: Failed fuel level sending unit #2 (float arm or resistor card)
Typical repair costs for P1431 range from $200 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but fuel gauge readings will be inaccurate. Driver should track mileage carefully to avoid running out of fuel.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1431 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Manufacturer
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