2020 Chevrolet Impala Check Engine Light in Murray, UT

It means the OBD-II system stored a diagnostic trouble code that identifies an affected engine or emissions system on your 2020 Chevrolet Impala.

The light can be triggered by minor issues (like a loose gas cap) or more serious faults (such as misfires or catalytic converter efficiency problems). Our Murray, UT team uses GM factory scan tools to read codes and freeze-frame data, then confirms the cause with targeted testing. Book online to minimize downtime.

• Steady light = service soon; flashing light = stop driving and arrange a tow
• GM factory diagnostics provide deeper data than generic readers
• Schedule now via schedule service

Common causes include O2 sensor faults, EVAP leaks (often a loose or failing gas cap), MAF sensor issues, engine misfires, and catalytic converter efficiency codes.

On the 3.6L V6 flex-fuel Impala, Utah temperature swings can aggravate EVAP leaks, while aging sensors or ignition components may lead to lean conditions or misfires. We confirm the exact cause with scan data and isolation tests, then provide a written estimate before repairs.

• Check your gas cap; tighten until it clicks
• Persistent misfires can overheat and damage the catalytic converter
• Book diagnostics at schedule service

A steady light usually allows short, cautious driving to service, but a flashing light indicates a severe misfire—stop driving and arrange a tow to prevent damage.

Continuing to drive with a flashing light can overheat the catalytic converter and increase repair costs. If the light is steady, reduce load, avoid hard acceleration, and head to Larry H. Miller Chevrolet Murray for diagnosis. Use our online tool to plan your visit.

• Flashing light: park safely and tow in
• Steady light: drive gently and service soon
• Reserve a slot at schedule service

A parts store reads generic codes, while our dealership performs full diagnosis with GM factory scan tools, service bulletins, and OEM test procedures.

Many codes have multiple possible causes; we use live data, freeze-frame analysis, and pinpoint tests to find the true fault and prevent repeat visits. Our OEM-certified technicians in Murray provide a documented diagnostic report and an upfront, written estimate before any repair.

• Access to manufacturer-specific data and updates
• Isolation testing to confirm root cause
• Transparent estimate after diagnosis

No—clearing the light resets OBD readiness monitors, and most emissions tests will fail until required drive cycles are completed.

If you erase codes right before testing, several monitors will show “not ready,” triggering an automatic fail even if no light is on. Instead, get the underlying issue diagnosed and repaired, then complete normal driving cycles. Our Murray team can verify readiness before you test.

• Avoid clearing codes before inspection
• Complete drive cycles so monitors set to “ready”
• Book verification at schedule service

Schedule online anytime using our service scheduler at /service/scheduler.htm.

Choose a time that fits your day, then arrive at 5500 S State St, Murray, UT 84107 for GM-certified diagnostics. You can also review current offers before booking. Our advisors will confirm your concerns and provide a written estimate after testing.

• Reserve a slot at schedule service
• See current offers at service specials
• Convenient location in Murray near Salt Lake City

We start your 2020 Chevrolet Impala diagnostic with a full OBD-II scan to capture codes and freeze-frame data. Next, we verify the concern and review live sensor readings to identify patterns such as lean trims, misfire counters, or catalyst efficiency. Depending on the findings, we perform isolation tests: smoke testing for EVAP leaks, MAF and O2 sensor checks, ignition component inspection, and targeted circuit tests. A controlled road test may follow to confirm behavior under load. You receive a written estimate before any repair work, along with a clear explanation of findings and next steps. Ready to move forward? Use our online tool to schedule service at your convenience.

Larry H. Miller Chevrolet Murray serves drivers from Salt Lake City, South Jordan, West Jordan, Midvale, and Sandy with GM-certified diagnostics for the 2020 Chevrolet Impala. Factory scan tools unlock manufacturer-specific data, service bulletins, and bidirectional controls that generic readers can’t access—critical for accurate cause-and-effect testing. Local conditions matter: winter cold can trigger cold-start and misfire-related codes, while temperature swings often reveal EVAP leaks. Our process verifies the exact fault to prevent parts-swapping and repeat visits. Visit us at 5500 S State St, Murray, UT 84107, view current service specials, or schedule service online for a time that fits your day.

The 2020 Chevrolet Impala may display codes such as P0300 (random/multiple misfire), P0420 (catalyst efficiency below threshold), P0171 (system too lean), P0101 (MAF performance), and EVAP leaks like P0455/P0456. P0300 left unresolved can overheat and damage the catalytic converter; P0420 often points to catalyst or upstream issues that require confirmation testing; lean conditions (P0171) may stem from intake leaks, fuel delivery, or sensor drift; EVAP leaks range from a loose cap to cracked lines. Ignoring these can lead to drivability issues, higher emissions, and more expensive repairs later. Bring your 2020 Chevrolet Impala to Larry H. Miller Chevrolet Murray in Murray for an accurate diagnosis — schedule service.