Buick Century Custom Archives - Transmission Digest
4T65-E’s and the Mysterious Code P0730

A 2001 Buick Century Custom came to a transmission shop with a complaint of jerky shifts. A road test of the vehicle showed that all shifts were harsh, and a scan check registered the generic gear-ratio-error code P0730. Since code P0730 does not illuminate the malfunction-indicator light, the harsh shift was the customer’s only clue that anything was wrong.