When your 2021 Hyundai Palisade displays the P0305 code, the engine control module has detected repeated misfires in cylinder 5. The 2021 Palisade uses the 3.8L Lambda II V6 producing 291 horsepower. With six cylinders numbered 1-6, P0305 is a legitimate diagnostic code.
2021 Palisade Powertrain
The Palisade uses Hyundai's 3.8L Lambda II V6, a proven naturally aspirated engine paired with an 8-speed automatic transmission. This is the only engine available on the Palisade, making all models capable of experiencing a cylinder 5 misfire.
Cylinder 5 Location
On Hyundai's 3.8L V6, cylinder 5 is located on the rear bank (toward the firewall) in the center position. The transverse engine mounting makes access somewhat challenging, potentially requiring removal of intake components.
Common Causes
Spark plug wear is a primary cause, especially if approaching service intervals. Ignition coil failure can occur at cylinder 5. Intake manifold gasket issues can affect individual cylinder performance. Fuel injector problems may cause lean misfires. Carbon buildup on intake valves can accumulate over time on direct-injection variants.
Diagnostic Process
Read all codes and freeze frame data. Access cylinder 5's spark plug and inspect for wear or fouling. Test the ignition coil. Check for vacuum leaks around the intake manifold. Verify fuel injector operation.