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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 76 (3.7L/4.7L/5.7L - DTCS P0503 To P0703 - NGC - 1500 & 2500) >> Diagnosis and Testing >> P0503-Vehicle Speed Sensor 1 Erratic >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2011 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
ACTIVE BUS OR COMMUNICATION DTCS
TIRE CIRCUMFERENCE
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . 

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