Brake Booster Vacuum Sensor Performance
Table of contents
C1100 HUMMER Possible Causes
- Faulty Brake Booster Vacuum Sensor
- Brake Booster Vacuum Sensor harness is open or shorted
- Brake Booster Vacuum Sensor circuit poor electrical connection
How do I fix code C1100 HUMMER?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- – C1100 00: Brake Booster Vacuum Sensor Performance
- – C1100 01: Brake Booster Vacuum Sensor Signal Circuit Shorted to Battery
- – C1100 02: Brake Booster Vacuum Sensor Signal Circuit Short to Ground
- – C1100 08: Brake Booster Vacuum Sensor Circuit Signal Invalid
- – C1100 09: Brake Booster Vacuum Sensor Change Above Threshold
Cost of diagnosing the C1100 HUMMER code
The cost of diagnosing the C1100 HUMMER code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Anti-Lock Brake System (ABS) Warning Light ON
- Engine Light ON (or Service Engine Soon Warning Light)
C1100 HUMMER Description
The Electronic Brake Control Module (EBCM) provides a power 5-volt reference to the brake booster vacuum sensor. The brake booster vacuum sensor converts the change in vacuum levels in the brake booster into a voltage signal. This signal is sent to the EBCM. The voltage signal ranges, from 0.13 to 3.30 volts depending on vacuum levels. The low reference is the return side of the sensor to ground.