P0499 - Evaporative Emission System Vent Valve Control Circuit High

Repair Importance Level: 1/3
Repair Difficulty Level: 3/3    What is this?
Table of contents

P0499 Possible Causes

  • Faulty Canister Close Valve (CCV)
  • Canister Close Valve harness is open or shorted
  • Canister Close Valve circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How do I fix code P0499?

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.

Cost of diagnosing the P0499 code

Labor: 1.0

The cost of diagnosing the P0499 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.

When is the code detected?

The Engine Control Module (ECM) has detected pressure in the EVAP system during a non-purge condition.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0499 Description

The Evaporative Emissions (EVAP) system prevents Hydrocarbon (HC) vapors from the fuel tank from escaping into the atmosphere where they could form photochemical smog. Gasoline vapors are collected in the charcoal canister. The Canister Close Valve (CCV) closes off the air inlet into the canister for leak detection of the evaporative emission system. The CCV also prevents fuel vapors from escaping from the canister. When the engine purges the HC vapors from the canister, the clean air comes into the canister through the canister air-filter and the CCV.
OBDII Code P0499 - Evaporative Emission System Vent Valve Control Circuit High - AutoCodes.com

P0499 More Information

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Information for specific makes

  • P0499 CHRYSLER NVLD Vent Valve Solenoid Circuit High
  • P0499 DODGE NVLD Vent Valve Solenoid Circuit High
  • P0499 HYUNDAI Evaporative Emission System Vent Valve Control Circuit High
  • P0499 JEEP NVLD Vent Valve Solenoid Circuit High
  • P0499 KIA Evaporative Emission System Vent Valve Control Circuit High

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