P0499 GMC Code - Evaporative Emission System Vent Valve Control Circuit High
Quick Answer
The Evaporative Emission (EVAP) Vent Solenoid Valve is located on the EVAP canister and is used to seal the canister vent. Common causes include Faulty Evaporative Emission Vent Solenoid Valve, Evaporative Emission Vent Solenoid Valve harness is open or shorted, Evaporative Emission Vent Solenoid Valve electrical circuit poor connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- P0499 GMC indicates Evaporative Emission System Vent Valve Control Circuit High.
- Common causes
- Common causes include Faulty Evaporative Emission Vent Solenoid Valve, Evaporative Emission Vent Solenoid Valve harness is open or shorted, Evaporative Emission Vent Solenoid Valve electrical circuit poor connection.
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code P0499 GMC Description
What are the Possible Causes of the DTC P0499 GMC?
- Faulty Evaporative Emission Vent Solenoid Valve
- Evaporative Emission Vent Solenoid Valve harness is open or shorted
- Evaporative Emission Vent Solenoid Valve electrical circuit poor connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0499 GMC?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0499 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific GMC Models
- P0499 2014 GMC Sierra — Evaporative Emission System Vent Valve Control Circuit High
- P0499 2015 GMC Sierra — Evaporative Emission System Vent Valve Control Circuit High
- P0499 2016 GMC Sierra — Evaporative Emission System Vent Valve Control Circuit High
- P0499 2017 GMC Sierra — Evaporative Emission System Vent Valve Control Circuit High
- P0499 2018 GMC Sierra — Evaporative Emission System Vent Valve Control Circuit High
Frequently Asked Questions about P0499 GMC Code
1. What does the OBDII code P0499 mean on a GMC vehicle?
P0499 indicates an issue with the evaporative emission (EVAP) system vent valve control circuit, specifically that the circuit voltage is higher than expected.
2. What are the common symptoms of code P0499 on a GMC?
Symptoms may include an illuminated Check Engine Light, difficulty refueling due to tank pressure issues, a noticeable fuel odor, or a failed emissions test.
3. What causes the P0499 code to appear on a GMC vehicle?
Common causes include a faulty EVAP vent valve, damaged or corroded wiring in the vent valve circuit, a defective control module, or a clogged EVAP system vent.
4. How is the P0499 code diagnosed on a GMC?
A technician will use an OBDII scanner to confirm the code, inspect the vent valve and wiring for damage, and test the voltage and continuity of the EVAP vent valve circuit.
5. Can I still drive my GMC with a P0499 code?
While the vehicle may still be drivable, ignoring this code can lead to increased emissions or fuel system issues. It's best to address the problem promptly.
6. How do I fix the P0499 code on a GMC vehicle?
Repairs may include replacing the EVAP vent valve, repairing damaged wiring or connectors, cleaning the vent system, or updating the vehicle's ECU if necessary.
7. How much does it cost to fix the P0499 code on a GMC?
Repair costs can range from $100 to $300, depending on whether the vent valve needs replacement or if wiring repairs are required.
8. Can a loose gas cap cause the P0499 code on a GMC?
No, a loose gas cap typically triggers different EVAP-related codes, such as P0455 or P0442, but it is not directly related to the P0499 code.
9. What tools are needed to troubleshoot the P0499 code on a GMC?
Tools may include an OBDII scanner, a multimeter to check voltage and continuity, and basic hand tools for inspecting and replacing components.
10. Will clearing the P0499 code with a scanner fix the problem?
Clearing the code will turn off the Check Engine Light temporarily, but the underlying issue must be resolved to prevent the code from returning.
Discuss the causes and fixes for P0499 GMC OBDII Code
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