LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chrysler >> 2009 >> 300 LX >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0579 To P0643 >> P0585-Speed Control Switch 1/2 Correlation (Except Police Package) >> Possible Causes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Possible Causes

Possible Causes 
(V71) S/C SIGNAL 1 CIRCUIT SHORTED TO VOLTAGE
(V71) S/C SIGNAL 1 CIRCUIT OPEN OR EXCESSIVE RESISTANCE
(V72) S/C SIGNAL 2 CIRCUIT SHORTED TO VOLTAGE
(V72) S/C SIGNAL 2 CIRCUIT OPEN OR EXCESSIVE RESISTANCE
(V937) S/C SWITCH GROUND CIRCUIT OPEN OR EXCESSIVE RESISTANCE
(V71) S/C SIGNAL 1 CIRCUIT SHORTED TO GROUND
(V72) S/C SIGNAL 2 CIRCUIT SHORTED TO GROUND
(V71) S/C SIGNAL 1 CIRCUIT SHORTED TO THE (V937) S/C SWITCH GROUND CIRCUIT
(V72 S/C SIGNAL 2 CIRCUIT SHORTED TO THE (V937) S/C SWITCH GROUND CIRCUIT
SPEED CONTROL SWITCH
STEERING CONTROL MODULE (SCM)
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See  DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure  .