A P0302 code on your 2023 Toyota Highlander signals that the engine control module has detected misfires in cylinder 2. On a relatively new vehicle, this issue is likely covered under warranty and should be addressed by a Toyota dealer.
Warranty Coverage for 2023 Models
The 2023 Highlander is covered under Toyota's 3-year/36,000-mile basic warranty and 5-year/60,000-mile powertrain warranty. A misfire issue indicating potential ignition or engine component failure should be covered for repair at no cost to you.
Possible Causes on New Vehicles
For a new 2023 Highlander, cylinder 2 misfire could result from manufacturing defect in ignition coil, assembly error with spark plug installation, fuel injector malfunction, software calibration issue, or rarely, internal engine component defect. External factors like water intrusion or fuel contamination are also possible.
Dealer Diagnostic Process
Toyota technicians will retrieve the P0302 code and freeze frame data, then follow factory diagnostic procedures to identify the cause. Common fixes include ignition coil replacement, spark plug replacement or re-torquing, injector replacement, or software update if applicable.
Documenting the Issue
Keep records of when symptoms started, any check engine light illumination, and how the vehicle drives. This information helps technicians diagnose the issue and creates documentation should the problem recur.