P0442 2003 Infiniti G35 Code - EVAP Control System Leak Detected Small Leak
Quick Answer
The Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for the following conditions: - Large and small leaks - Excess vacuum - Purge flow during non-commanded conditions - Fuel Level and Fuel Pressure sensor faults - EVAP Purge and Vent Valve faults The ECM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. 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
- P0442 2003 Infiniti G35 indicates EVAP Control System Leak Detected Small Leak.
- Common causes
- Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
- 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 P0442 2003 Infiniti G35 Description
- Large and small leaks
- Excess vacuum
- Purge flow during non-commanded conditions
- Fuel Level and Fuel Pressure sensor faults
- EVAP Purge and Vent Valve faults
The ECM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The ECM commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions are met in order to apply an engine vacuum to the EVAP system. The ECM commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. This test verifies if a vacuum can be achieved in the EVAP system. Failure to develop a vacuum may be caused by a large leak or a restriction.
What are the Possible Causes of the DTC P0442 2003 Infiniti G35?
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
How to Fix the DTC P0442 2003 Infiniti G35?
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.
Code Tech Notes
There is an Infiniti Service Bulletin to help diagnose the P0442 code:
Infiniti Factory Service Bulletin OBDII Code P0442
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0442 2003 Infiniti G35 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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Frequently Asked Questions about P0442 2003 Infiniti G35 Code
What does the OBDII code P0442 mean for a 2003 Infiniti G35?
P0442 indicates that the EVAP (Evaporative Emission Control) system has detected a small leak in the system, which could allow fuel vapors to escape.
What are common symptoms of the P0442 code on a 2003 Infiniti G35?
Symptoms may include the check engine light turning on, a faint smell of fuel, and potentially a slight decrease in fuel efficiency, though performance issues are uncommon.
What causes the P0442 code to appear?
Common causes include a loose or damaged gas cap, a cracked or disconnected EVAP hose, a faulty purge valve, or a leaking EVAP canister.
Can a loose gas cap trigger the P0442 code?
Yes, a loose or improperly sealed gas cap is one of the most common reasons for the P0442 code.
How can I fix the P0442 code on my 2003 Infiniti G35?
Start by checking and tightening the gas cap. If that doesn’t resolve the issue, inspect EVAP hoses for cracks or disconnections, and consider having the purge valve or EVAP canister checked.
Is the P0442 code serious?
The P0442 code is generally not urgent, but it should still be addressed to prevent excessive fuel vapor emissions and avoid failing an emissions test.
Can I drive my 2003 Infiniti G35 with the P0442 code?
Yes, the car is typically safe to drive with the P0442 code, but it’s best to fix the issue promptly to maintain proper emissions control.
How do I diagnose the P0442 code?
Use an OBDII scanner to confirm the code, inspect the gas cap for damage, and visually check EVAP components like hoses and the canister for signs of leaks.
What tools are needed to repair the P0442 code?
You may need an OBDII scanner, a gas cap (if replacement is necessary), and basic tools to inspect and replace EVAP system components.
Will replacing the gas cap always fix the P0442 code?
No, while replacing the gas cap often resolves the issue, it won’t fix the code if the problem lies elsewhere in the EVAP system, such as a cracked hose or faulty valve.
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