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Home >> Jeep >> 2012 >> Wrangler Sport, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Transmission Control Module (TCM) - Electrical Diagnostics) >> DTC Troubleshooting >> P1639-TCM Internal-Can 2 Ram Performance >> Set Condition:

Set Condition:

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If the TCM detects an internal error with the controllers Random Access Memory (RAM) on the CAN controller 2 section of the microprocessor.