OBD Guide
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C1101

Brake Booster Vacuum Sensor Performance

C1101 is an OBD-II diagnostic trouble code meaning: Brake Booster Vacuum Sensor Performance. Common causes: brake booster vacuum sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Increased braking distance
  • Hard brake pedal
  • Check Engine Light Is On
  • Reduced braking performance

Causes

  • Brake booster vacuum sensor malfunction
  • Open or short circuit in the sensor circuit
  • Damage to the sensor connector
  • Vacuum leak in the brake booster system
  • Vacuum pump malfunction
  • Problems with the brake booster

How to Fix

  1. Check the integrity of the wiring and connectors of the sensor
  2. Check the vacuum level in the brake booster system
  3. Check the operation of the vacuum pump
  4. Replace brake booster vacuum sensor if necessary
  5. Check the brake booster for leaks

Related codes

C1102C1103P0106

FAQ

What does the C1101 code mean?

C1101 is an OBD-II diagnostic trouble code that indicates: Brake Booster Vacuum Sensor Performance

What causes a C1101 error code?

The most common causes of C1101 include: Brake booster vacuum sensor malfunction; Open or short circuit in the sensor circuit; Damage to the sensor connector; Vacuum leak in the brake booster system.

How do I fix a C1101 diagnostic trouble code?

To fix C1101: Check the integrity of the wiring and connectors of the sensor. Check the vacuum level in the brake booster system. Check the operation of the vacuum pump. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1101?

Limited driving only, diagnose soon

How much does it cost to fix C1101?

The estimated repair cost for C1101 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat