I've never seen codes that make the price go up but I have seen codes that are incompatible with corporate rate codes. For example, Hertz gives an American Express corporate rate but sometimes coupons require a different corporate rate (like AAA) and the coupon + new rate is actually a worse deal than just the original corporate rate.
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Incidentally, be careful with rental cars. There are codes out there which cause the quoted price to go up!
I've never seen codes that make the price go up but I have seen codes that are incompatible with corporate rate codes. For example, Hertz gives an American Express corporate rate but sometimes coupons require a different corporate rate (like AAA) and the coupon + new rate is actually a worse deal than just the original corporate rate.
Citation? Not doubting you, just generally curious.