LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> Engine Performance >> System >> Data Communications System >> Diagnostic Information and Procedures >> DTC U1901 >> Diagnostic Fault Information
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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
scientia non olet · About LEMON Manuals