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Home >> Buick >> 2012 >> Regal GS, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Data Communications System >> Diagnostic Information and Procedures >> DTC C0550 >> Circuit/System Verification
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Circuit/System Verification

  1. Verify that DTC B1325, B1330, B1370, B1380, B1424, B1440, B1441, B1517, C0800, C0899, C12E1, P0560, or P0562 is not set.
  2. Verify that DTC C0550 is not set.
    • If the DTC is set with symptom byte 39 or 43, program the control module that set the DTC. If the DTC resets, replace the control module that set the DTC.
    • If the DTC is set with other symptom bytes, replace the control module that set the DTC.
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