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Replace the "jumper" wire between the sensor and the harness. It is about a foot long. There is an updated jumper. Fichtner can order and it costs about $40. Also seems to me a second (updated - additional) bracket should be order for the new jumper. Fichtner did not send or recommend said bracket...but I did not ask either...when I ordered my updated wire.
Else, check the jumper for damage and tightness. Reapply die-electric grease to the connectors.
Otherwise a GM sensor is $400.00 dollars and requires separation off the lower ball joint.
Steel brake lines can also bring on this code as can mis matched tires.