DTC B0608: BCM Power MODING Error: Description

BCM receives voltage inputs from 3 ignition signals. BCM receives voltage from IGN 0 fuse (wake-up signal) when ignition switch is in any position except LOCK. BCM receives voltage from PCM-BCM fuse (10-amp) when ignition switch is in RUN or START position. BCM receives voltage from CRANK SIGNAL fuse (10-amp) when ignition switch is in START position.

DTC B0608 will set when BCM detects any of the following conditions for more than 0.3 second: Ignition 1 is active and Ignition 0 is inactive; CRANK is active and Ignition 0 is inactive; or CRANK is active and Ignition 1 is inactive. No driver warning message will be displayed.

If conditions for malfunction no longer exist, history DTC will clear after 100 consecutive ignition cycles. DTC B0608 will also clear when conditions no longer exist or when scan tool is used to clear codes.

NOTE: If DTC B0608 is a history code, problem may be intermittent. Wiggle wires while performing the following test.

NOTE: When ignition switch is turned to RUN position with BCM disconnected, PCM-related DTC P1626 will be set. After BCM repair is completed, see appropriate TESTS W/CODES article in ENGINE PERFORMANCE section:

TESTS W/CODES - Century
TESTS W/CODES - Regal