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P0442 on 2016 Malibu LT - Small EVAP Leak

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Chris P. · rep 0 · May 25, 1:38 AM · 1 replies · solved · Question

Vehicle: 2016 Chevrolet Malibu LT

I've got a check engine light on my 2016 Chevrolet Malibu LT (1.5L Turbo) and it's throwing a P0442 code, which my scanner says is a "Small Evaporative Emission System Leak Detected." I checked the gas cap, tightened it, and cleared the code, but it came back after a couple of days.

Is there anything else I can easily check myself before taking it in? I'm hoping it's not an expensive fix, as the car runs perfectly fine otherwise. What are the most common culprits for a small EVAP leak on these models?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:38 AM

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ClearTheCode admin answer:

A P0442 code indicates a small leak in your vehicle's Evaporative Emission (EVAP) system. Since you've already checked and retightened the gas cap, which is the most common and easiest fix, here are other common areas to investigate for your 2016 Chevrolet Malibu LT:

  1. Inspect EVAP Hoses and Lines:

    • Visually inspect all rubber and plastic EVAP lines running from the fuel tank to the engine bay, and to the charcoal canister. Look for any cracks, splits, loose connections, or signs of rodent damage. Pay close attention to connections near the fuel tank, the purge valve, and the vent valve.

  2. Purge Valve (Canister Purge Solenoid):

    • The purge valve is typically located in the engine bay. It controls the flow of fuel vapors from the charcoal canister to the engine. If it's stuck open, it can create a vacuum leak that the EVAP system detects. You can sometimes test it by disconnecting the vacuum line while the engine is running; if you hear a constant hiss or feel strong vacuum, it might be stuck open. A professional can test its operation electronically.

  3. Vent Valve (Canister Vent Solenoid):

    • The vent valve is usually located near the charcoal canister (often near the fuel tank). It opens to allow fresh air into the canister during the purge cycle and closes to seal the system for leak tests. If it's stuck open or has a faulty seal, it will cause a P0442. Visually inspect it for damage or debris.

  4. Charcoal Canister:

    • While less common, the charcoal canister itself can sometimes develop cracks or damage, especially if the vehicle has hit road debris. It's typically located under the vehicle near the fuel tank.

When to see a shop: If you can't find a visible leak after checking the hoses and valves, or if the code persists, it's time to take your Malibu to a professional. Mechanics use a specialized smoke machine to diagnose EVAP leaks. This machine injects non-toxic smoke into the EVAP system, and any leaks become visible as smoke escapes. This is the most effective way to pinpoint small, hard-to-find leaks that trigger a P0442 code.

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