Body Control Module - B2723 will not clear. Started acting up this morning when I went to start the car. Apparently this is related to the Pass-Key System.

I get a security light and check engine light.

This is a never ending cycle, even if I wait the required 3 minutes. In fact I have waited up to an hour before retrying.

Anything I can do to resolve this or is it onto a flat bed and off to the dealer ???

 

ttt

 

Clean both the the contacts on the pellet in the key and in the igniton key slot:


From the manual:
If the key resistor pellet is incorrect, there will be no BCM outputs to the theft deterrent relay or to the PCM. This state will last about 3 minutes . If a key is inserted, or the ignition is turned ON again before the 3 minute time frame is complete, the timer will reset to 3 minutes . Disconnecting the battery will not clear the timer sequence, but the timer will reset to 3 minutes when the battery power is restored. Even if a proper key is inserted during one of the time periods, the vehicle will not start until the total time period has lapsed.



Clean away any dirt or grease from the key resistor. The foreign substances could interfere with the key detection circuit and set a DTC.
If there is an open or a short to voltage on the PASS-key(R) signal or ground circuit. The vehicle will exhibit a no crank condition.
Check for any poor connections at the BCM and at the ignition lock cylinder. A poor connection can cause an open, a short, incorrect PASS Key(R) resistance, or an intermittent malfunction. If the DTC is a history DTC, the problem may be intermittent. Perform the tests while moving the related wiring, the connectors, and the key. This can often cause the malfunction to appear. Refer to intermittents and Poor Connections. See: Intermittents and Poor Connections

 

Thanks Richin Chicago, disassembly revealed that on of the pass-key connectors in the key tumbler was broken off. Time to replace the lock CYLINDER . 12458190 is the part number for it order one from GMPARTSDIRECT !