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Low Volts Confused Jeep

This bulletin applies to 2013 Jeep Wranglers equipped with a 2.8L engine and built before Oct. 10, 2012. The customer may experience a no-crank/no-start condition. Upon diagnosis, the technician may find an active B2204 ECU configuration mismatch. This condition may be caused by the vehicle’s voltage dropping below 4.5 volts for greater than 200 msec. The WCM will lose information from the EEPROM. Lost information can include key programming.

If an active B2204 is found, using the Tech 2, select the WCM icon. Select the misc. function tab. Highlight program ignition keys, and then select the green arrow to start the function. Locate and enter the pin, then select continue. Verify the pin, select YES and then continue.

Place the unprogrammed customer’s key in the ignition. At this point, close this routine.

Enter the diagnostic procedures folder home screen on wiTech and perform the reset ECU procedure for the WCM. Resetting the WCM will force the vehicle configuration to be relearned and written to the WCM EEPROM.

Select the diagnostic procedure tab. Highlight reset ECU and then select the green arrow to run diagnosis.

Select continue. Highlight WCM module and select continue. Select continue again (WCM resetting). Close the routine. Verify that the engine starts and runs.

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