If your 2022 Nissan Altima is displaying a P0305 code indicating a cylinder 5 misfire, this code requires diagnostic investigation. The 2022 Altima uses a 2.5-liter four-cylinder engine as its sole powertrain option. With only four cylinders numbered 1-4, P0305 referencing cylinder 5 is technically anomalous.
2022 Altima Powertrain
The 2022 Altima (sixth generation) uses the 2.5L QR25DE four-cylinder producing 188 horsepower. The optional variable compression turbo (VC-Turbo) was discontinued for 2022, leaving only the naturally aspirated 2.5L. Both engines that were ever offered on this generation were four-cylinders—no V6 has been available since 2018.
Understanding the Anomalous Code
Since the 2022 Altima has exactly four cylinders, a P0305 code cannot represent an actual cylinder 5 misfire. This is an erroneous diagnostic code requiring investigation into the diagnostic system rather than engine problems.
Possible Causes
ECM software issues can store invalid codes. Scan tool communication errors may misinterpret data. Low battery voltage affects ECM reliability. Aftermarket diagnostic tools may have compatibility issues with Nissan's systems. Previous diagnostic equipment data could cause residual code storage.
Diagnostic Steps
Use a Nissan-compatible scan tool to verify stored codes. Test battery condition. If actual misfire symptoms exist (rough running, hesitation), focus on cylinders 1-4. Clear the erroneous code and monitor for valid codes.