The 2C57 fault code, indicating “charging pressure control plausibility pressure too low,” is a common issue in Mini Coopers, particularly the R60 Countryman. This error often manifests under light acceleration and can be frustrating to diagnose. This guide outlines a comprehensive troubleshooting process based on a real-world case study of a 2012 R60 Countryman.
Common Causes and Solutions for the 2C57 Code
A 2012 R60 Countryman experiencing the 2C57 code underwent several repairs, ruling out common culprits. The owner replaced coils, spark plugs (NGK), the valve cover diaphragm, the diverter valve (OEM), and the pressure converter (OEM). Even a new high-pressure fuel pump, installed under warranty, didn’t resolve the issue.
Investigating the Turbocharger and Wastegate
Further investigation focused on the turbocharger system. The downpipe and converter were removed to visually inspect the wastegate. A hand vacuum pump confirmed the wastegate closed properly, seemingly creating a good seal with no noticeable play in the linkage. Despite this, the linkage was adjusted to ensure optimal travel distance (12-13mm). A vacuum gauge applied to the actuator revealed it reached approximately 10 inHg as the wastegate began closing, achieving a tight seal at 15 inHg.
Checking for Leaks and Pressure Testing
All pipes and hose connections were meticulously inspected for leaks. A pressure test, using an air compressor at 10 psi applied to the charge pipe, confirmed no audible leaks beyond the expected airflow into the intake.
Further Diagnostic Steps for the 2C57 Mini Cooper Code
Despite these extensive efforts, the 2C57 code persisted. Potential remaining causes could include issues with the boost pressure sensor, vacuum leaks in less accessible areas, or problems within the engine control unit (ECU) itself. Further diagnostics, potentially involving specialized tools like a smoke machine for leak detection or a professional-grade scan tool for in-depth data analysis, might be necessary.
Conclusion: Persisting with the 2C57 Mini Cooper Issue
Resolving the 2C57 code in a Mini Cooper can be a challenging process of elimination. While common components were replaced and the turbocharger system thoroughly checked, the problem persisted in this 2012 R60 Countryman. This underscores the importance of systematic troubleshooting and potentially seeking expert assistance when simpler solutions fail to yield results. Advanced diagnostic tools and techniques may be required to pinpoint the root cause and finally eliminate the frustrating 2C57 error.
