I tried a mixture of pepper and water - spray did not deter the critter.
I also bought a bottle of peppermint spray - it didn't stop the critter either, but the car smelled good.
I wish I could change the title of the post - it's not a chipmunk, it was mice.
I bought 4 mouse traps (the plastic easy set kind) and set one next to each front wheel, one on the battery (carefully arranged to not short it), and one on the engine cover. This morning, I had two dead mice: passenger wheel, and engine cover.
I'd post the photos, but that may violate some forum rules, so to summarize: two dead mice in traps.
My trail cam caught one of them. Also, the neighborhood cat investigated (seen on the trail cam)... she had ONE JOB! I guess she's more into birds.