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Home >> Jeep >> 2011 >> Grand Cherokee Laredo, 3.6 G, AWD >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> (Transmission Control Module (TCM) - Electrical Diagnostics) >> DTC Troubleshooting >> U1509-Implausible Engine Variant Message Data Length Received >> Possible Causes

Possible Causes

Possible Causes 
CAN BUS DTCS PRESENT
PCM DTCS PRESENT
TRANSMISSION CONTROL MODULE (TCM)

Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  NAG1 PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . 

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