FixVault

Possible Causes

WARNING: This page is about a different car, the 2012 Dodge Charger. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
(W538) FUEL LEVEL STATUS SIGNAL CIRCUIT OPEN OR SHORTED TO VOLTAGE
AFTERMARKET LIGHT/SIREN CONTROLLER
VEHICLE SYSTEM INTEGRATION MODULE (VSIM)