Porsche Cayenne 957 M55.1 Gearbox - Genuine Used Car Part

Diagnosis and Common Symptoms

The M55.1 powertrain in the Porsche Cayenne 957 utilizes a robust 6-speed Tiptronic transmission, yet it is susceptible to specific mechanical and hydraulic wear patterns over time. Technicians frequently observe the P0730 series of fault codes, indicating incorrect gear ratios, or P0741, relating to torque converter clutch performance. Common physical symptoms include harsh downshifts—specifically the 3-2 and 2-1 transition—slipping between higher gears, and "Limp Mode" activation where the instrument cluster flashes the PRNDS indicators. In many cases, internal seal degradation or valve body bore wear leads to pressure loss, necessitating a complete unit replacement to restore factory shift quality.

Introduction

Securing a reliable replacement for the Cayenne 957 3.6L V6 requires a unit that has been verified under load. This Genuine Used M55.1 gearbox has been salvaged from a donor vehicle with documented service history and underwent a rigorous multi-point inspection. We prioritize mechanical integrity, ensuring that the internal clutch packs and planetary gear sets remain within operational tolerances. By choosing a Genuine tested part, you avoid the high failure rates associated with substandard rebuilds and ensure total compatibility with the existing Porsche Communication Management and Transmission Control systems.

Product Details

• Brand: Porsche (Aisin Warner)
• Model Compatibility: Porsche Cayenne 957 (2007–2010) 3.6L V6
• Part Name: M55.1 6-Speed Tiptronic Transmission
• Condition: Genuine Used (Tested Working)
• Notes: Unit has been drained of ATF for transit. It is mandatory to install a new filter, pan gasket, and use Porsche-spec fluid (JWS 3309) during installation.