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Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> Engine Performance >> System >> Data Communications System >> Diagnostic Information and Procedures >> DTC U1901 >> Diagnostic Fault Information

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
B+ 1 1 - -
Serial Data 1 U1901 00 U1901 00 U1901 00
Ground 1 1 - -
1. S56 Radio Control Multifunction Switch Malfunction