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Re: GMC Truck 4.3l V6, year 1995, ABS trouble
Posted to Technical Discussion Forum on 9/24/2006 3 Replies

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Could the 12 be a 21?

12 & 25 are codes for front sensor malfunctions or open circuits

27 is for erratic L/F WSS signal

66 is for open or shorted pump motor relay (internal to the ABS unit)

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