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Home >> Jeep >> 2006 >> Commander Base, 3.7 K, AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Transmission Control Systems >> Nag1 Automatic Transmission - Electrical Diagnostics >> Electrical Diagnostics >> DTC Troubleshooting >> U1401-Implausible Engine Speed Signal Received >> Possible Causes

Possible Causes

Possible Causes 
FCM CAN BUS DTC'S PRESENT
ENGINE MODULE DTC'S PRESENT
TRANSMISSION CONTROL MODULE

Always perform the  NAG1 PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE   before proceeding. 

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