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Home >> Jeep >> 2010 >> Wrangler Islander, Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> (Transmission Control Module (TCM) - Electrical Diagnostics - 42RLE Automatic Transmission) >> DTC Troubleshooting >> DTC P0602: Control Module Programming Error/Not Programmed >> Theory Of Operation

Theory Of Operation

The controller is programmed during manufacturing with generic software to facilitate testing. However, generic software does not have the proper calibrations to control a transmission in a vehicle. The check for generic software is made at power-up. If generic software is found , the MIL will light immediately and the MIL will stay on even if the fault is cleared, until the proper software is installed.

NOTE: Transmission will be placed in limp-in mode.
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