What Does P006C Mean?
The ECM has detected a correlation error between the MAP (Manifold Absolute Pressure) sensor and the turbocharger/supercharger inlet pressure sensor. The inlet pressure sensor measures pressure entering the compressor side of the turbo, while the MAP sensor measures pressure in the intake manifold after the turbo and intercooler. Their relationship should follow predictable patterns. A mismatch indicates a sensor fault, boost leak, or physical restriction. The driver may notice poor turbo performance, loss of boost, or limp mode.
Common Causes
28%
Failed or drifted turbo inlet pressure sensor
25%
Boost leak between turbocharger and intake manifold (intercooler piping, clamps, or intercooler itself)
20%
Faulty MAP sensor providing incorrect manifold pressure readings
15%
Air filter restriction reducing inlet pressure below expected levels
12%
Turbocharger mechanical issue (worn bearings, damaged compressor wheel) affecting pressure development
Diagnostic Steps
1
At KOEO, verify both MAP and turbo inlet pressure sensors read atmospheric pressure. Any sensor significantly off at rest is the likely fault.
2
Perform a boost leak test by pressurizing the intake system to 15-20 PSI with the engine off using a boost leak tester. Listen and look for leaks at all intercooler connections, pipe clamps, and the intercooler itself.
3
During a road test, monitor turbo inlet pressure, MAP, and boost pressure PIDs simultaneously. Inlet pressure should drop slightly below atmospheric under boost (as the turbo pulls air through), while MAP rises. If the inlet drops excessively, check for an air filter restriction.
4
Inspect the intercooler for cracks or end-tank leaks. Apply soapy water to the intercooler while pressurized and watch for bubbles.
5
Check the turbocharger compressor wheel for play, damage, or oil contamination by removing the intake pipe at the turbo. Axial play should be minimal (typically less than 0.003 inches).
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
The ECM has detected a correlation error between the MAP (Manifold Absolute Pressure) sensor and the turbocharger/supercharger inlet pressure sensor. The inlet pressure sensor measures pressure entering the compressor side of the turbo, while the MAP sensor measures pressure in the intake manifold a...
The most common cause of P006C (MAP - Turbocharger/Supercharger Inlet Pressure Correlation) is: Failed or drifted turbo inlet pressure sensor
Typical repair costs for P006C range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle may enter limp mode with significantly reduced power. Avoid situations requiring full power such as highway merging or towing. If caused by a boost leak, the engine may run lean under load, risking engine damage. Diagnose within 1 week.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P006C to identify the root cause.
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Quick Info
Category
Powertrain
System
Turbocharger / Supercharger System
Difficulty
Type
Generic (SAE)
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