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DTC C1222: Wheel Speed Signal Mismatch

  1. Check for proper wheel and tire size, front to rear and side to side. Check for excessive wheel bearing endplay. Check toothed sensor indicator ring for bent sensor ring or missing teeth. Repair as necessary. If wheels, bearing endplay and toothed sensor indicator ring are okay, go to next step.
  2. Using scan tool, clear DTCs. Turn ignition off, and then on. Test drive vehicle faster than 15 MPH. Using scan tool, retrieve DTCs. If DTC C1222 is set, replace Hydraulic Control Unit (HCU). Repeat self-test. If any other DTC is set, go to appropriate DTC for diagnosis. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  table. If no DTCs are set, ABS is operating normally.
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