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Home >> Dodge and Ram >> 2013 >> Durango R/T, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 389 ((Vehicle System Interface Module (VSIM) Module - Electrical Diagnostics)) >> DTC Troubleshooting >> P1504-Vehicle Speed Output Circuit Low >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2013 Dodge Charger. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
VEHICLE SPEED SIGNAL CIRCUIT SHORTED TO GROUND
AFTERMARKET LIGHT/SIREN CONTROLLER
VEHICLE SYSTEM INTERFACE MODULE (VSIM)
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