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Home >> Buick >> 2021 >> Enclave Preferred >> Repair and Diagnosis >> Engine Performance >> System >> Data Communications - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC U0020 >> Circuit/System Verification

Circuit/System Verification

Diagnosis of this DTC is accomplished via the symptom or an additional DTC. Refer to

Scan Tool Does Not Communicate with Low Speed GMLAN Device , or

Diagnostic Trouble Code (DTC) List - Vehicle .

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