The Mini Cooper 2c57 fault code, indicating “charging pressure control plausibility pressure too low,” is a common issue that can be frustrating to diagnose and repair. This article outlines a comprehensive troubleshooting process undertaken on a 2012 R60 Countryman experiencing this persistent problem.
Addressing the Mini Cooper 2C57 Code on a 2012 R60 Countryman
The 2C57 code typically triggers during light acceleration under load, even though the vehicle may otherwise operate normally. Numerous components have already been replaced in an attempt to resolve the issue:
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Ignition System Refresh: New ignition coils and NGK spark plugs were installed.
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Valve Cover Diaphragm: The valve cover diaphragm was replaced with a new silicone unit, despite the old one appearing intact.
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Diverter and Pressure Converter: Both the diverter valve and pressure converter were replaced with new OEM parts.
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Fuel Pump Replacement: The high-pressure fuel pump was replaced under an extended warranty.
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Wastegate Inspection: The downpipe and catalytic converter were removed to visually inspect the wastegate. The wastegate was observed to close properly under vacuum, with no apparent play in the linkage. However, the linkage was adjusted to ensure a travel distance of 12-13mm. A vacuum test confirmed a tight seal at 15in Hg.
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Leak Testing: All pipes and hose connections were meticulously checked. The charge pipe was even pressurized to 10psi using an air compressor to detect leaks, but none were found. Air was heard entering the intake manifold, confirming system integrity.
Despite these extensive efforts, the 2C57 code continues to reappear. The persistent nature of the problem suggests a more subtle issue may be at play. Potential causes that warrant further investigation include:
- Boost Leaks: While a pressure test was performed, even minor undetected leaks can contribute to low boost pressure. Specialized smoke testing might reveal smaller leaks.
- Wastegate Actuator: Although the actuator appears to function correctly, internal issues within the actuator itself could be causing inconsistent boost control.
- Turbocharger Issues: Internal damage to the turbocharger, such as worn bearings or damaged vanes, can affect boost pressure.
- ECU and Sensors: Faulty sensors, such as the boost pressure sensor or mass airflow sensor, can provide inaccurate readings to the Engine Control Unit (ECU), leading to incorrect boost control and triggering the 2C57 code. Problems with the ECU itself could also be a factor.
Next Steps in Diagnosing the 2C57 Code
Further diagnostic steps are recommended to pinpoint the root cause:
- Smoke Test: Perform a thorough smoke test of the intake system to identify any remaining boost leaks.
- Data Logging: Use a diagnostic tool to log boost pressure, mass airflow, and other relevant sensor data during driving conditions that trigger the fault code. This data can provide valuable insights into the system’s behavior.
- Component Testing: Test individual components, such as the boost pressure sensor and mass airflow sensor, to verify their proper operation.
Resolving the Mini Cooper 2C57 code often requires a systematic and persistent approach. By meticulously examining each potential cause and utilizing appropriate diagnostic tools, the underlying issue can be identified and rectified.
