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C1100 GMC Code - Brake Booster Vacuum Sensor Performance

- Code Popularity: 8,231 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC C1100 GMC?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Brake Booster Vacuum Sensor
  • Brake Booster Vacuum Sensor harness is open or shorted
  • Brake Booster Vacuum Sensor circuit poor electrical connection
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How to Fix the DTC C1100 GMC?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code 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

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1100 GMC code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Anti-Lock Brake System (ABS) Warning Light ON
  • Engine Light ON (or Service Engine Soon Warning Light)

Code C1100 GMC 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.

OBDII Code C1100 GMC - Brake Booster Vacuum Sensor Performance - AutoCodes.com
C1100 GMC Code - Brake Booster Vacuum Sensor Performance

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Code C1100 GMC comments

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