Suzuki Reno transmission shifting issue between 3rd and 4th gear with error codes P0783, P0700, and P0734 on Suzuki Reno

Some Suzuki Reno owners report experiencing transmission shifting issues between 3rd and 4th gear, often accompanied by error codes P0783, P0700, and P0734. These error codes indicate specific malfunctions, such as a 3-4 shift malfunction and a general transmission control system issue. Owners have noted that problems may persist even after the transmission valve block has been replaced, suggesting potential issues with the Transmission Control Module (TCM) or the transmission itself. Additionally, low transmission voltage during the 3-4 shift can lead to further complications. Some have also reported that a failing Brake C piston seal can cause harsh shifting, triggering the malfunction indicator light with the aforementioned codes. A Technical Service Bulletin (TSB) regarding internal piston failure may also be relevant for some owners facing these issues. To address these concerns, it is recommended that owners conduct a thorough inspection of the TCM, consider replacing the Brake C piston seal, and adhere to TSB guidelines if internal piston failure is suspected.