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Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> Engine Performance >> System >> Data Communications System >> Diagnostic Information and Procedures >> DTC U1811 >> Circuit/System Verification

Circuit/System Verification

Verify that DTC U0074 is not set.

If the DTC is set, refer to DTC U0074 (Mid Speed or Chassis Expansion Bus) , DTC U0074 (Powertrain Expansion Bus) .

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