2016 Chevrolet Impala Check Engine Light in Murray, UT

It means the OBD-II system stored a fault code—examples include P0442 (small EVAP leak) or P0300 (random misfire).

Your Impala’s 2.5L inline-4 triggers the light when the engine or emissions system detects a condition outside normal range. A basic code read points to a system, but root-cause testing confirms the failed part or condition. In Murray’s changing temperatures, EVAP-related codes are common if the gas cap is loose or a small leak develops.

• Named systems: EVAP, ignition, fuel, air metering, catalyst efficiency
• Examples: P0171 (system too lean), P0420 (catalyst efficiency below threshold)
• Schedule a diagnostic: schedule service

Typical causes include O2 sensor faults, EVAP leaks, MAF sensor issues, catalytic converter efficiency codes, and ignition misfires.

On the 2.5L Impala, a loose gas cap or small EVAP leak can set P0440/P0442, while aging O2 sensors or misfires may cause drivability changes. Mountain-pass driving and seasonal swings along the Wasatch Front can stress emissions components and reveal marginal sensors or seals.

• Check the fuel cap first; retighten until it clicks
• Watch for rough idle, hesitation, or poor MPG as misfire clues
• Book diagnostics online: schedule service

A steady light means drive cautiously to service; a flashing light signals an active misfire that can damage the catalytic converter.

If the light is steady and the car drives normally, reduce load and plan a diagnostic soon. If it flashes, stop driving and arrange towing to avoid overheating the catalyst and risking further engine damage. Our Murray team can evaluate your Impala quickly to help prevent escalation.

• Steady = non-urgent fault; flashing = misfire risk
• Avoid hard acceleration and towing until checked
• View current offers: service specials

A parts store provides a generic P0xxx code; our dealership performs full diagnosis with GM factory scan data and pinpoint testing.

Codes indicate a system, not the failed part. Dealer-level tools access live data, freeze-frame details, and manufacturer-specific parameters your Impala relies on. Our OEM-certified technicians in Murray isolate the root cause and provide a written estimate before you approve repairs.

• Factory scan access and guided diagnostics
• System-specific tests to confirm the fault
• Transparent estimate before any work; schedule an appointment

No—clearing codes resets OBD-II readiness monitors, and Utah inspections fail vehicles with monitors not set to “ready.”

After a reset, your Impala must complete specific drive cycles so monitors can run and report. If the underlying fault remains, the light will return and the vehicle will not pass. Proper diagnosis and repair restore monitor readiness and help you pass local testing.

• Readiness monitors must be “ready” for inspection
• Drive cycles vary by system and conditions
• Book diagnostics to resolve the root cause: schedule service

A flashing light indicates an active misfire that can overheat the catalytic converter within minutes.

Misfires dump unburned fuel into the exhaust, quickly raising catalyst temperature. If you’re driving near Salt Lake City or up the canyons, reduce load and pull over safely to prevent damage. Arrange towing to Larry H. Miller Chevrolet Murray for inspection and repair advice.

• Common related codes: P0300–P0304
• Stop driving to protect the catalyst
• Get help now: schedule service

Our diagnostic process focuses on finding the cause, not just the code. We begin with an OBD-II scan and review freeze-frame data to see when and how the fault set. A visual inspection and targeted tests (such as smoke testing for EVAP leaks or ignition checks for misfires) help confirm the issue on your 2016 Chevrolet Impala. You19ll receive a clear explanation of findings and a written estimate before any repair work proceeds. Check current offers to manage costs and plan your visit. When you19re ready, use our online tool to pick a time that fits your schedule.

View service specials or schedule service.

Larry H. Miller Chevrolet Murray serves the greater Salt Lake City areaincluding South Jordan, West Jordan, Midvale, and Sandywith dealer-level diagnostics tailored to your 2016 Chevrolet Impala. Factory scan capability goes beyond generic code readers, giving our OEM-certified technicians detailed data to isolate the fault. Along the Wasatch Front, winter cold starts can trigger rich/lean and misfire codes, while spring and fall temperature swings often reveal small EVAP leaks. We19ll verify the concern, document results, and review next steps so you can decide confidently. Find us at 5500 S State St, Murray, UT 84107. Use our online scheduler or drop off during business hours for efficient check-in.

Schedule an appointment for your 2016 Chevrolet Impala today.

Several code families appear frequently on the 2016 Chevrolet Impala 2.5L. EVAP system codes like P0440/P0442 suggest vapor leaks or a loose gas cap. P0171 (system too lean) can point to unmetered air or fuel delivery issues, while P0300 series codes indicate cylinder misfires that may cause rough running. P0420 signals reduced catalytic converter efficiency, often a result of prolonged misfire or sensor concerns. Ignoring these warnings can lead to higher repair costs and potential emissions-test failure. Addressing the root cause early protects the catalyst and restores performance. Bring your 2016 Chevrolet Impala to Larry H. Miller Chevrolet Murray in Murray for an accurate diagnosis — schedule service.

Schedule service or review service specials before you visit.