If your 2019 Chevrolet Malibu is displaying a P0305 code indicating a cylinder 5 misfire, this code requires diagnostic investigation. The 2019 Malibu is available only with four-cylinder engines—the 1.5L turbocharged four-cylinder or the 2.0L turbocharged four-cylinder (on Premier trim). Neither engine has a cylinder 5, making P0305 anomalous.
2019 Malibu Engine Options
The 2019 Malibu offers the 1.5L Turbo I-4 producing 160 horsepower on most trims. The Premier trim offers the 2.0L Turbo I-4 with 250 horsepower. GM discontinued V6 engines in the Malibu after the previous generation. Both available engines have only four cylinders.
Understanding the Anomalous Code
With cylinders numbered 1-4 on both available engines, a P0305 code cannot represent an actual cylinder 5 misfire. This is an erroneous code that requires investigation into the diagnostic system rather than traditional engine misfire diagnosis.
Possible Causes
ECM software glitches can store invalid codes. Scan tool communication errors may misread data. Low battery voltage affects ECM reliability. Aftermarket scan tools may have compatibility issues with GM's electronics. A 2019 model may also have accumulated enough age for internal ECM issues to develop.
Diagnostic Steps
Verify which engine is installed (1.5L or 2.0L). Use a GM-compatible scan tool to confirm codes and review freeze frame data. Test battery condition. If actual misfire symptoms exist, diagnose cylinders 1-4 using standard procedures. Clear the erroneous code and monitor for return.