2020 Dodge Charger Check Engine Light

It means the OBD-II system stored a diagnostic trouble code (DTC) such as P0442 (EVAP small leak) or P0300 (random misfire).

Your Charger’s powertrain control module logs a code and freeze-frame data when a fault is detected. Our Tucson team interprets Chrysler-specific data to determine whether the issue is emissions-related, a sensor fault, a vacuum leak, or an ignition misfire. Addressing it early prevents damage to components like the catalytic converter. You can schedule service online for a focused diagnosis.

• Reads and verifies stored and pending DTCs
• Reviews freeze-frame data under fault conditions
• Performs isolation testing to confirm root cause

The five most common systems are O2 sensor (P013x), EVAP leak (P044x), MAF/airflow (P0101), catalytic efficiency (P0420), and misfire (P030x).

On a 3.6L V6 Charger, minor EVAP leaks and aging oxygen sensors are frequent, while ignition or fuel issues can trigger misfire codes. Leaving misfires unresolved can overheat and damage the catalytic converter. Our Chrysler-capable scan tools at Larry H. Miller Dodge RAM FIAT Tucson separate symptoms from causes so you fix the right part the first time.

• Smoke testing can confirm EVAP leaks
• Live data helps verify sensor operation
• Ignition testing isolates coil, plug, or injector faults

If the light is flashing, stop driving to avoid severe misfire damage; if it’s steady, drive gently to a service facility.

A flashing light signals active misfire that can quickly overheat the catalytic converter; towing may be safest. A steady light often relates to emissions or sensor issues but still needs prompt attention. Our Tucson service team can verify severity and advise next steps—use our schedule service tool or call (520) 462-9486.

• Flashing = misfire risk to catalytic converter
• Steady = schedule diagnosis soon
• Avoid heavy loads or high RPM until checked

A free scan only reads basic codes; dealer-level diagnosis uses factory tools, isolation testing, and Chrysler data to find the exact cause.

Many codes have multiple potential causes, and guessing leads to unnecessary parts. Our MOPAR-certified technicians access proprietary modules, perform actuator tests, and confirm faults before any repair. You’ll receive a written estimate and can review service specials before approving work.

• Factory scan tool access (Chrysler/MOPAR)
• Pinpoint testing to verify root cause
• Written estimate before any repair

No—resetting clears readiness monitors, and your Charger may fail Arizona emissions until monitors complete drive cycles.

Clearing codes erases stored data the test looks for, so the vehicle can show “not ready.” The proper approach is diagnosing and fixing the underlying fault, then completing drive cycles to set all monitors. Our team in Tucson can confirm readiness and advise when to test.

• Fix fault, then verify monitor readiness
• Drive cycles may take multiple trips
• We provide a post-repair readiness check

Diagnostic fees at Larry H. Miller Dodge RAM FIAT Tucson are often credited toward the resulting repair after we confirm the root cause.

Costs vary based on the testing required after the initial code read, such as smoke testing an EVAP system or oscilloscope checks on sensors. You will receive an up-front, written estimate before any repair. Check our current service specials and schedule service to lock in a convenient time.

• Up-front, written estimate provided
• Fee often applied if you proceed with repair
• No parts replaced without your approval

We start by confirming your concern and connecting a factory-capable scan tool to your 2020 Dodge Charger. An initial OBD-II scan pulls stored and pending DTCs along with freeze-frame data. Next, a technician verifies the fault with live data and targeted isolation tests—this can include smoke testing the EVAP system for small leaks, checking fuel trims, or using an oscilloscope on sensors and ignition components. When needed, we perform a road test under the same conditions that set the code. You’ll receive a written estimate before any repair so you can decide with confidence. Every visit includes a complimentary multi-point inspection. Ready to proceed? Use our online schedule service tool or call (520) 462-9486 for assistance.

Several codes recur on the 2020 Dodge Charger, each pointing to a system that needs verification. P0300–P0306 indicate random or cylinder-specific misfires; ignoring misfires can overheat and damage the catalytic converter, increasing repair costs. P0420 signals low catalytic converter efficiency, which may stem from unresolved misfires or exhaust leaks. P0442 or P0456 suggest small EVAP leaks—often minor, but they can keep the light on and cause failed inspections if left untreated. P0101 points to airflow measurement concerns, and P0137–P0139 involve oxygen sensor performance. Because a single code can have multiple causes, confirmation testing is crucial to avoid unnecessary parts. Bring your 2020 Dodge Charger to Larry H. Miller Dodge RAM FIAT Tucson in Tucson for an accurate diagnosis — schedule service.

Generic code readers only identify basic faults; our Chrysler-capable equipment on the 2020 Dodge Charger reads enhanced data, runs bi-directional tests, and captures freeze-frame conditions so we can pinpoint issues quickly. Factory-trained MOPAR technicians interpret manufacturer data that universal tools miss, which helps distinguish a failing sensor from wiring, vacuum, or mechanical causes. You can review current service specials and then schedule service at a time that fits your day. Find us at 4220 E 22nd St, Tucson, AZ, and call (520) 462-9486 with any questions about your 2020 Dodge Charger check engine light. Clear answers, verified testing, and a written plan—so you only fix what’s necessary.