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Home >> Buick >> 2013 >> Regal GS, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U0074 (Powertrain Expansion Bus with HP6) >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition ON.
  2. Verify that DTC P0606 is not set.
    • If DTC P0606 is not set 
  3. Refer to Circuit/System Testing .
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