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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 90 ((Powertrain Control Module (Pcm) - Electrical Diagnostics - 68RFE Automatic Transmission)) >> Diagnosis and Testing >> P0731-Gear Ratio Error In 1ST >> 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 
CUT UD PISTON SEAL
LOW FLUID LEVEL
CRACKED OR MIS-INSTALLED PRIMARY OIL FILTER OR SEAL
STUCK OR STICKING MAIN REGULATOR VALVE
FAILED OVERRUNNING CLUTCH
BURNED UD CLUTCH
CUT UD ACCUMULATOR SEAL RING
CRACKED UD ACCUMULATOR PISTON
BROKEN REACTION SHAFT SUPPORT SEAL RING
LOW LINE PRESSURE
BROKEN / MISSING MAIN VALVE BODY BLEED ORIFICE
BROKEN / MISSING DRIBBLER ORIFICE ASSEMBLY IN REACTION SHAFT SUPPORT
POOR MACHINING ON PUMP VALVE BODY FACE
FAILED UD SHAFT
BROKEN OUTPUT SHAFT WELD
FAILED INPUT GEARSET
INPUT OR OUTPUT SPEED SENSOR(S) AND RELATED WIRING
TRANSMISSION SOLENOID/TRS ASSEMBLY
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  68RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE   .