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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 571 (Nag1 Automatic Transmission - Electrical Diagnostics) >> DTC Troubleshooting >> U1509-Implausible Engine Variant Message Data Length Received >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
FCM CAN BUS DTC'S PRESENT
ECM/PCM DTC'S PRESENT
TRANSMISSION CONTROL MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.  (Refer to TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)  

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