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Chevrolet
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2009
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Impala Police
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Repair and Diagnosis
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Engine Performance
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System
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Data Communication System
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Diagnostic Information and Procedures
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DTC U1826 or U1827
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Diagnostic Aids
Diagnostic Aids
Use the DTC Descriptor list above to determine the module which is not communicating.
If there are multiple non-communicating modules choose the one closest to the EBCM.