The Mini Cooper 2c57 fault code, indicating “charging pressure control plausibility pressure too low,” is a common issue that can be frustrating to diagnose. This article outlines a comprehensive troubleshooting process undertaken on a 2012 R60 Countryman experiencing this persistent problem.
Steps Taken to Resolve the 2C57 Code
Numerous components were replaced and inspected in an attempt to resolve the 2C57 code:
- Ignition System Refresh: New ignition coils and NGK spark plugs were installed. Although this maintenance was performed shortly before the 2C57 code appeared, it’s a crucial step in ensuring optimal engine performance.
- Valve Cover Diaphragm Replacement: The valve cover diaphragm, even though not visibly damaged, was replaced with a new silicone unit. This component is often implicated in pressure-related issues.
- Diverter Valve and Pressure Converter: Both the diverter valve and pressure converter were replaced with OEM parts to eliminate them as potential sources of the problem.
- Fuel Pump Replacement: The high-pressure fuel pump was replaced under an extended warranty. While not directly related to boost pressure, a faulty fuel pump can contribute to performance issues that might trigger related codes.
- Wastegate Inspection and Adjustment: The downpipe and catalytic converter were removed to visually inspect the turbocharger wastegate. A hand vacuum pump confirmed the wastegate’s ability to close and seal. The wastegate actuator linkage was adjusted to ensure optimal travel distance (12-13mm) and a strong vacuum hold (10in Hg at initial closure, tight seal at 15in Hg).
- Leak Testing: All pipes and hose connections were thoroughly checked for leaks. The charge pipe was pressurized to 10psi using an air compressor and adapter. No leaks were detected.
The 2C57 Code Persists
Despite these extensive efforts, the Mini Cooper continues to throw the 2C57 code, typically under light acceleration and load. The vehicle runs without noticeable performance issues, but the persistent fault code indicates an underlying problem remains unsolved.
Seeking Further Solutions for the Mini Cooper 2C57 Code
The next steps in diagnosing this issue might involve:
- Smoke Testing: A smoke test can pinpoint even the smallest leaks in the intake system that might not be detectable with other methods.
- Boost Leak Testing: While a pressure test was performed, a dedicated boost leak test specifically designed for turbocharged systems might reveal more subtle leaks.
- ECU and Sensor Examination: Investigating the engine control unit (ECU) for software glitches or examining sensors like the manifold absolute pressure (MAP) sensor for proper function could provide further insights.
Conclusion
Troubleshooting the Mini Cooper 2C57 error code can be a complex and challenging process. Even after addressing common culprits, the problem may persist. Further diagnostic steps, such as smoke testing, boost leak testing, and examining the ECU and related sensors, may be necessary to identify the root cause and finally resolve this frustrating issue.
