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Possible Causes

WARNING: This page is about a different variant/trim than selected.
Possible Causes 
RELATED TRANSMISSION DTCS PRESENT
LOSS OF PRIME DTC PRESENT
(T50) L/R PRESSURE SIGNAL CIRCUIT OPEN
(T50) L/R PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND
(T50) L/R PRESSURE SIGNAL CIRCUIT SHORTED TO VOLTAGE
TRANSMISSION SOLENOID/PRESSURE SWITCH ASSEMBLY
POWERTRAIN CONTROL MODULE (PCM)

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

PRESSURE SWITCH STATES

GEAR  L/R  2/4  OD 
R OPEN OPEN OPEN
P/N CLOSED OPEN OPEN
1st CLOSED OPEN OPEN
2nd OPEN CLOSED OPEN
D OPEN OPEN CLOSED
OD OPEN CLOSED CLOSED