OBD Guide
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P149B

Evaporative Emission System Shutoff Valve 2 Control Circuit Low

P149B is an OBD-II diagnostic trouble code meaning: Evaporative Emission System Shutoff Valve 2 Control Circuit Low. Common causes: evap valve no. 2 malfunction, open or short circuit in control circuit. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Check Engine Light Is On
  • Increased fuel consumption
  • Unstable engine idling
  • The smell of gasoline in or around the car
  • Dips during acceleration

Causes

  • EVAP valve No. 2 malfunction
  • Open or short circuit in control circuit
  • Poor contact in connectors
  • Engine control unit malfunction
  • Contact corrosion

How to Fix

  1. Check valve control circuit integrity
  2. Check resistance of EVAP valve No. 2
  3. Inspect connectors and contacts for corrosion
  4. If necessary, replace EVAP valve No. 2
  5. Check the operation of the system after repair

Related codes

P149AP149CP0440

FAQ

What does the P149B code mean?

P149B is an OBD-II diagnostic trouble code that indicates: Evaporative Emission System Shutoff Valve 2 Control Circuit Low

What causes a P149B error code?

The most common causes of P149B include: EVAP valve No. 2 malfunction; Open or short circuit in control circuit; Poor contact in connectors; Engine control unit malfunction.

How do I fix a P149B diagnostic trouble code?

To fix P149B: Check valve control circuit integrity. Check resistance of EVAP valve No. 2. Inspect connectors and contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P149B?

Yes, but get it checked soon

How much does it cost to fix P149B?

The estimated repair cost for P149B is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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