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THe code is indeed internal to the ABS module, specifically there is a relay that is hard mounted in there that fails. Often the pump will continue to run, but in some cases it may not make proper contact. Also there is a ground under the drivers door on the frame that often come loose. If those grounds are good, and you have taken the bolt off and cleaned them to bare metal and the issue remains, then you will need to fix or replace the module.
I say fix because there is a place that repairs these. www.modulemasters.com can fix these at a fraction of the cost.