Porsche 986 987 Boxster S Transmission Control Module - Used Original Parts

Diagnosis and Common Symptoms

From the workshop floor, a failing Transmission Control Module (TCM) on a 986 or 987 Boxster S presents a distinct set of diagnostic challenges. Drivers will often report a "Tiptronic Emergency Run" or "Transmission Fault" warning on the instrument cluster. The primary symptoms include abrupt, harsh gear changes, a refusal to shift out of a specific gear (limp mode), or a complete loss of drive (D) and reverse (R) engagement.

On a diagnostic tool like the PIWIS, we typically see a pattern of fault codes. Look for communication errors with the DME (Digital Motor Electronics), such as U-codes, or specific transmission faults like P0730 (Incorrect Gear Ratio), P0753 (Shift Solenoid 'A' Electrical), or other solenoid circuit errors. A key diagnostic step is to inspect the module's electrical connector for transmission fluid intrusion, a common point of failure that shorts the internal circuitry.

Introduction

This is a Genuine Porsche Transmission Control Module for the Boxster S, meticulously removed and tested in-house. We understand that a new module from the dealer is prohibitively expensive. This unit has undergone full diagnostic verification on our bench to ensure all communication and processing functions are operating within Porsche specifications, offering a reliable and cost-effective solution to restore your Tiptronic S transmission's performance.

Product Details

• Brand: Porsche

• Model Compatibility: Porsche Boxster S (986, 987) with Tiptronic S Automatic Transmission

• Part Name: Transmission Control Module (TCM / TCU)

• Condition: Genuine Used (Tested Working)

• Notes: Verify part number on your original module matches this unit before purchase. Failure to match the part number will result in incompatibility.