OBD Guide
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C109E

Vacuum Sensor Circuit Fault

C109E is an OBD-II diagnostic trouble code meaning: Vacuum Sensor Circuit Fault. Common causes: open or short circuit in the sensor wiring harness, vacuum sensor malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Check engine light is on
  • Reduced brake efficiency
  • Unstable idle
  • Loss of engine power

Causes

  • Open or short circuit in the sensor wiring harness
  • Vacuum sensor malfunction
  • Poor contact or corrosion in the sensor connector
  • Engine control unit malfunction

How to Fix

  1. Check the integrity of the sensor's charity wires
  2. Check connections and sensor connector for corrosion
  3. Test vacuum sensor to specification
  4. If necessary, replace the sensor or wiring harness
  5. Reset the error code and check again

Related codes

P0106P0107P0108

FAQ

What does the C109E code mean?

C109E is an OBD-II diagnostic trouble code that indicates: Vacuum Sensor Circuit Fault

What causes a C109E error code?

The most common causes of C109E include: Open or short circuit in the sensor wiring harness; Vacuum sensor malfunction; Poor contact or corrosion in the sensor connector; Engine control unit malfunction.

How do I fix a C109E diagnostic trouble code?

To fix C109E: Check the integrity of the sensor's charity wires. Check connections and sensor connector for corrosion. Test vacuum sensor to specification. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C109E?

Limited driving only, diagnose soon

How much does it cost to fix C109E?

The estimated repair cost for C109E is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat