P0498 - Evaporative Emission Control System High Voltage - Common in 2015-2018 Honda Civic

Quick Answer

P0498 means: DTC P0498 signifies a high voltage reading at the evaporative emission control system's purge valve.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with P0498? It's advisable to address this issue promptly to prevent worsening symptoms and potential emissions-related fines.

Common Questions

What does P0498 mean and how does it affect my car?

The P0498 code signals a high voltage issue with your vehicle's evaporative emission control system, which could lead to increased emissions and reduced fuel efficiency. It’s important to address this to maintain your vehicle’s performance and to comply with emissions regulations.

What are the most common causes of P0498 and how much does it cost to fix?

The most frequent cause of P0498 is a faulty purge valve, costing around $150 to $300 to replace. Other causes include damaged wiring and ECM issues, each with potential repair costs ranging from $100 to $500 depending on the complexity of the problem.

Can I drive my car with P0498 or should I stop immediately?

While it might be safe to drive for a short period, it's recommended to address the P0498 code as soon as possible to prevent further damage to your emissions system and to avoid potential fines for excessive emissions.

How can I diagnose P0498 myself using GeekOBD APP?

You can start with the GeekOBD APP to scan for codes and view freeze frame data. Look for the P0498 code, then check the purge valve's voltage and resistance using a multimeter to pinpoint the issue.

What vehicles are most commonly affected by P0498?

Vehicles like the 2015-2018 Honda Civic, Nissan Altima (2013-2016), and Toyota Corolla (2014-2018) are frequently affected by the P0498 code, often due to similar emissions control system designs.

How can I prevent P0498 from happening again?

Regularly inspect your vehicle's emissions system, and ensure timely maintenance, including replacing old fuel caps and checking for leaks. Using high-quality fuel can also help maintain the integrity of the system.

What is P0498?

The Diagnostic Trouble Code (DTC) P0498 indicates an issue with the evaporative emission control system, specifically pointing to high voltage detected at the purge valve. This system is crucial in controlling emissions and ensuring that fuel vapors from the gas tank are properly routed to the engine for combustion rather than being released into the atmosphere. When this code triggers, it usually points to an electrical problem, such as a short circuit in the wiring, a faulty purge valve, or even issues with the engine control module (ECM). Real-world implications include potential increases in harmful emissions, reduced fuel efficiency, and in some cases, issues with the vehicle's performance, such as rough idling or stalling. Addressing this issue promptly is advisable, as ignoring it may lead to more severe engine problems and costly repairs down the line. For owners of vehicles like the 2015 Honda Civic, it's essential to monitor your vehicle's performance closely and seek professional help if you notice the check engine light illuminated, as this code could indicate a more extensive problem if left unaddressed.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P0498 is present:

  • The check engine light remains illuminated, indicating a fault within the evaporative emission system.
  • You may experience rough idling or stalling, particularly during low-speed driving or at stoplights, leading to a frustrating driving experience.
  • Fuel economy may drop noticeably, often between 10-15%, which can strain your wallet over time.
  • The vehicle might fail an emissions test, which is critical for registration in many areas and can lead to additional fines or penalties.
  • In some cases, you might notice a gas smell around the vehicle, indicating possible fuel vapor leaks.

Possible Causes

Most common causes of P0498 (ordered by frequency):

  1. The most common cause of P0498 is a faulty purge valve, which can occur in about 60% of cases. This valve regulates fuel vapor flow and can malfunction due to wear and tear.
  2. A short circuit or damaged wiring leading to the purge valve is another typical culprit, accounting for around 25% of occurrences. This can happen due to exposure to heat or moisture over time.
  3. Improper installation of aftermarket components related to the emissions system can also lead to this code, so always ensure that parts are compatible.
  4. Less common but serious causes include a failing ECM, which can misinterpret signals from the purge valve, leading to incorrect vehicle operation.
  5. In rare cases, a vacuum leak elsewhere in the evaporative system can trigger this code, complicating diagnostics.

P0498 Repair Costs

Cost Breakdown by Repair Type

Purge Valve Replacement

Replacing the faulty purge valve with an OEM part to ensure compatibility and reliability.

  • Total: $150 - $300
  • Success rate: 85%
Wiring Repair

Repairing damaged wiring leading to the purge valve, which may include replacing sections of wire or connections.

  • Total: $100 - $200
  • Success rate: 90%
Money-Saving Tips for P0498
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional P0498 Diagnosis Process

Follow these systematic steps to accurately diagnose P0498. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Perform an initial visual inspection of the engine bay, focusing on the purge valve and associated wiring for any signs of damage or corrosion (5-10 minutes)

Step 1: Perform an initial visual inspection of the engine bay, focusing on the purge valve and associated wiring for any signs of damage or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: Use an OBD2 scanner, like the GeekOBD APP, to read the codes and gather freeze frame data to contextualize the fault (10-15 minutes)

Step 2: Use an OBD2 scanner, like the GeekOBD APP, to read the codes and gather freeze frame data to contextualize the fault (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Conduct component testing on the purge valve using a multimeter to check for proper voltage and resistance (20-30 minutes)

Step 3: Conduct component testing on the purge valve using a multimeter to check for proper voltage and resistance (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: After any repairs, perform a system function test to ensure everything operates correctly and clear the codes from the ECM (10-15 minutes)

Step 4: After any repairs, perform a system function test to ensure everything operates correctly and clear the codes from the ECM (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Complete a road test under various driving conditions to verify that the repair was successful and that the check engine light remains off (15-20 minutes)

Step 5: Complete a road test under various driving conditions to verify that the repair was successful and that the check engine light remains off (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Purge Valve Replacement on 2016 Honda Civic

Vehicle: 2016 Honda Civic, 45,000 miles

Problem: The customer reported a persistent check engine light and decreased fuel efficiency.

Diagnosis: Using the GeekOBD APP, we confirmed the P0498 code and conducted a visual inspection. The purge valve was found to be faulty.

Solution: Replaced the faulty purge valve with an OEM part. Cleared the codes and performed a test drive to verify repairs.

Cost: $250 (parts: $150 for the valve, $100 for labor)

Result: The check engine light was resolved, and fuel efficiency returned to normal.

Case Study 2: Wiring Repair on 2015 Nissan Altima

Vehicle: 2015 Nissan Altima, 60,000 miles

Problem: Owner noticed a gas smell and a check engine light. The GeekOBD APP revealed code P0498.

Diagnosis: Visual inspection showed damaged wiring near the purge valve due to wear.

Solution: Repaired the damaged wiring and secured connections. Cleared the codes and conducted a road test.

Cost: $180 (parts: $50 for wiring, $130 for labor)

Result: The gas smell disappeared, and the vehicle passed emissions testing.

Diagnose P0498

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
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  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P0498
System: Powertrain (Engine, Transmission, Emissions)
Severity: MEDIUM
Category: Engine Codes