If your 2023 Toyota Highlander displays a P0305 code, diagnosis depends on your powertrain. The Highlander offers the 3.5L V6 or hybrid (four-cylinder based). P0305 only applies to V6 models.
V6 Highlander: Understanding P0305
In the 3.5L V6, cylinder 5 is on the rear of the left bank. The engine uses individual coil-on-plug ignition.
Hybrid: Anomalous Code
Hybrid Highlanders use a 2.5L four-cylinder. P0305 would be anomalous, indicating a diagnostic system issue.
Diagnostic Steps
Confirm your powertrain. V6: inspect cylinder 5 ignition components. Hybrid: investigate diagnostic anomaly.