The code C1688 for a 2015 Kia Forte typically indicates a problem related to the vehicle's Electric Power Steering (EPS) system but you might have two problems, we will find out soon enough. The clicking noise sounds like the starter is out this guide can help us test the trigger wire (small black wire) for power when the engine is being cranked over.
https://www.2carpros.com/articles/starter-not-working-repair
Here is the starter location and how to change it out in case the trigger wire is getting power. Also, will the engine crank over in neutral? Check out the images (below). Please let us know what happens. Here is the starter wiring diagrams as well so you can see how the system works.
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Monday, November 6th, 2023 AT 5:05 PM