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Home >> Cadillac >> 2019 >> XTS Platinum, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Diagnostic Information and Procedures >> DTC C027B (With J55) >> Diagnostic Fault Information

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Vacuum Pump Relay B+ - - - -
Vacuum Pump Relay Control C027B 00 C027B 00 1 -
Vacuum Pump Relay Ground - - - -
Brake Booster Vacuum Sensor 5V Reference C1100 00 C1100 00 C1100 00, C1100 01 -
Brake Booster Vacuum Sensor Signal C1100 00, C1100 02 C1100 00 C1100 00, C1100 01 C1100 09, C1100 5A
Brake Booster Vacuum Sensor Low Reference - C1100 00 - -
Brake Booster Pump Motor Control - - 1 -
Brake Booster Pump Motor Ground - - - -
1. Brake Booster Pump Motor Always ON