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ABS and Service brake system light on.

Spudulike
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Spudulike New Member

Spudulike

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I have a 2005 Sierra 1500 4x4. Showing codes P0856 and P1689. Both relate to traction control which my truck does not have! Have replaced wheel sensors and electronic brake controller and done some wiring continuity checks but still getting the codes and lights.Anyone have ay idea what this could be? Any help greatly appreciated.

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