DTC P006C MAP – Turbocharger/Supercharger Inlet Pressure Correlation

DTC P006C is a diagnostic trouble code indicating a correlation issue between the Manifold Absolute Pressure (MAP) sensor and the Turbocharger/Supercharger Inlet Pressure sensor. Understanding and addressing this issue is crucial for maintaining your vehicle’s efficiency and performance. In this article, we’ll delve into the details of DTC P006C, exploring what it means, its potential causes, and how to diagnose and fix this issue effectively.

What is DTC P006C?

The P006C diagnostic trouble code (DTC) signifies that there is a discrepancy between the readings of the Manifold Absolute Pressure (MAP) sensor and the Turbocharger/Supercharger Inlet Pressure sensor. The MAP sensor measures the pressure inside the intake manifold, while the Turbocharger/Supercharger Inlet Pressure sensor measures the pressure at the inlet of the turbocharger or supercharger. These readings are essential for the engine control unit (ECU) to calculate the correct air-fuel mixture and boost pressure for optimal engine performance. When the ECU detects a correlation issue between these sensors, it means that their readings are not in sync, leading to potential engine performance issues.

Potential Causes of DTC P006C:

The P006C code is triggered when the ECM detects that the MAP sensor and Turbocharger/Supercharger Inlet Pressure sensor readings are not aligned. This can happen due to several reasons:

  • Faulty MAP Sensor: The MAP sensor may be malfunctioning, providing incorrect pressure readings.
  • Faulty Turbocharger/Supercharger Inlet Pressure Sensor: The inlet pressure sensor may be malfunctioning, leading to incorrect pressure readings.
  • Wiring Issues: Damaged or corroded wiring or connectors associated with the MAP or Turbocharger/Supercharger Inlet Pressure sensors can cause incorrect signals.
  • Vacuum Leaks: Leaks in the intake manifold can affect the MAP sensor’s readings.
  • Boost Leaks: Leaks in the turbocharger or supercharger system can affect the inlet pressure sensor’s readings.
  • ECU Issues: Although rare, a malfunctioning ECU could incorrectly interpret the sensor signals.

Symptoms of P006C

When the P006C code is set, you might experience the following symptoms:

  • Check Engine Light (CEL) illuminated on the dashboard.
  • Reduced engine performance.
  • Poor fuel efficiency.
  • Rough idling or stalling.

Diagnostic and Repair Procedures for DTC P006C:

Diagnosing and resolving the P006C code requires a systematic approach:

  • Initial Inspection: Connect a diagnostic scanner to the vehicle’s OBD-II port to retrieve the trouble codes, including P006C. Record any additional codes and freeze frame data to understand the conditions under which the code was set.
  • Visual Inspection: Conduct a thorough visual inspection of the MAP and Turbocharger/Supercharger Inlet Pressure sensors and their wiring harnesses. Look for signs of damage, corrosion, or disconnection.
  • Verify Sensor Readings: Use the diagnostic scanner to compare the readings of the MAP sensor and Turbocharger/Supercharger Inlet Pressure sensor. Their readings should correlate accurately under various engine conditions.
  • Check Wiring and Connectors: Inspect the wiring and connectors for both sensors for any signs of damage, corrosion, or incorrect routing. Repair or replace any damaged wiring as necessary.
  • Test the MAP Sensor: Use a multimeter to test the MAP sensor’s voltage output and resistance. Compare the readings with the manufacturer’s specifications. Replace the MAP sensor if it is faulty.
  • Test the Turbocharger/Supercharger Inlet Pressure Sensor: Similarly, test the inlet pressure sensor to ensure it is functioning correctly. Replace the sensor if it is faulty.
  • Inspect for Vacuum Leaks: Check the intake manifold and associated vacuum lines for leaks. Repair any leaks found to ensure accurate MAP sensor readings.
  • Inspect for Boost Leaks: Check the turbocharger or supercharger system for leaks. Repair any leaks found to ensure accurate inlet pressure sensor readings.
  • Check for ECU Issues: Although rare, inspect the ECU for any potential faults or software issues that could cause incorrect interpretation of sensor signals. Reprogram or replace the ECU if necessary.
  • Clear Codes and Perform Test Drive: After completing the repairs, clear the trouble codes from the vehicle’s memory using the diagnostic scanner. Perform a test drive to ensure the vehicle operates properly and that the P006C code does not return.


Understanding and addressing DTC P006C is essential for maintaining optimal engine performance and fuel efficiency. By following these detailed diagnostic and repair procedures, you can effectively address the P006C trouble code, ensuring the MAP and Turbocharger/Supercharger Inlet Pressure sensors are correctly synchronized and interpreted by the ECU. Regular maintenance and careful inspection of sensors and wiring can help prevent this code from appearing.

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