Does asking for an extension on your car loan hurt your credit?

I have a loan with Toyota Financial and really need to ask for an extension on my payment this month (meaning they allow me to skip this month's payment and just add a payment to the back of the loan) but I want to know if that will hurt my credit. Also, I have a co-signer, will they ask the co-signer to make the payment instead of giving me the extension? I don't really want the co-signer to know I asked for it.