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Mack Granite 2005 Solenoid Valve Problem

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Hey, I have a Mack Granite 2005 which is giving me a code that says 000000743, 8 SPN, engine 1 Retarder Unable Solenoid Valve Abnormal Frequency. I am wondering if the ABS is the problem or what else can be causing this issue? Thanks for the help I greatly appreciate it

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