Experiencing a sudden transmission issue in your Mitsubishi equipped with the Twin Clutch SST (TC-SST)? A common culprit, indicated by the P1590 error code, is a communication breakdown between the TC-SST ECU and the Engine Control Module (ECM). This article details a personal experience with this issue, including troubleshooting steps and the ultimate solution.
Understanding the P1590 Mitsubishi Error Code
The P1590 diagnostic trouble code (DTC) specifically points to a “TC-SST-ECU to ECM Communication Error in Torque Reduction Request.” This essentially means the transmission control unit is unable to effectively communicate with the engine control unit, often leading to the vehicle entering a fail-safe or “limp mode” to prevent further damage. Along with P1590, you might also encounter the U0101 code, indicating a “TCM Time-out,” further suggesting a communication problem. Mitsubishi’s official technical information resources confirm these codes and their associated meanings:
- P1590: https://mitsubi****echinfo.com/data/…0001400USA.htm
- U0101: https://mitsubi****echinfo.com/data/…0004400USA.htm
Mitsubishi Evo X SST Gearbox
Initial troubleshooting involved checking all connections, fuses, relays, and inspecting for transmission fluid leaks. However, these checks revealed no apparent issues. Using an OBD-II scanner and EvoScan software, the P1590 and U0101 codes were retrieved, confirming the communication error.
Resolving the P1590 Error: TC-SST Re-teach Procedure
Research suggested a potential solution: performing a TC-SST re-teach procedure. This process involves using specialized software to reset and re-calibrate the transmission control unit, effectively re-establishing communication with the ECM. Finding clear instructions for this procedure proved challenging initially. Fortunately, a detailed YouTube tutorial provided a step-by-step guide on obtaining the necessary software, downloading the required files, converting them, and executing the re-teach procedure.
The YouTube video linked below offers a comprehensive walkthrough of the process:
Following the instructions in the video, the re-teach procedure was successfully completed. This resolved the communication error, cleared the P1590 and U0101 codes, and restored normal transmission function. The vehicle resumed operating as expected, with crisp and smooth gear shifts.
Conclusion
The P1590 error code in a Mitsubishi equipped with the TC-SST transmission signifies a critical communication problem between the TC-SST ECU and the ECM. While initial troubleshooting steps like checking connections and fluids are essential, a TC-SST re-teach procedure may be necessary to resolve the underlying communication breakdown. Utilizing resources like the YouTube tutorial mentioned above can guide you through this process, ultimately restoring your vehicle’s transmission to proper working order. If you encounter this issue, thorough diagnostics and a properly executed re-teach procedure can effectively address the P1590 Mitsubishi error.
