P00C6
Turbocharger/Supercharger Boost Control A PerformanceP00C6 is a generic OBD-II powertrain diagnostic trouble code: Turbocharger/Supercharger Boost Control A Performance. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P00C6 means
DTC P00C6 is set when the ECM detects that the actual boost pressure produced by Turbocharger/Supercharger Boost Control circuit A does not match the commanded target within acceptable limits. Unlike a simple over-boost or under-boost code, a performance fault indicates that the system's ability to regulate boost is degraded, meaning the actuator is responding but not achieving the intended result accurately or consistently.
Common sources include a sticking or worn wastegate, a boost control solenoid that is mechanically operational but no longer capable of precise duty-cycle control, leaks in the charge air system that allow boost to escape before the sensor measures it, or a pressure sensor that has drifted out of calibration. Turbine or compressor wheel damage can also reduce the turbocharger's ability to build target pressure.
In many calibrations the ECM will enter a reduced-performance or limp mode to protect the engine when P00C6 is active, limiting boost and therefore power output. Diagnosis should begin with live data to compare commanded versus actual boost before any parts are replaced.
Common causes
Most-frequently reported root causes when P00C6 is logged.
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1
Sticking or damaged wastegate actuator or linkage.
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2
Boost control solenoid with degraded mechanical performance.
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3
Boost pressure sensor that has drifted or is reading inaccurately.
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4
Charge air system leak between the turbocharger outlet and the throttle body.
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5
Faulty intercooler or intercooler hose causing boost loss.
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6
Worn turbocharger with reduced ability to build target pressure.
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7
Restrictions in the air intake upstream of the turbocharger compressor.
Symptoms drivers notice
How to diagnose P00C6
A typical diagnostic flow when this code is present.
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1
Read all stored DTCs and freeze-frame data to understand the conditions under which the fault was recorded.
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2
Monitor commanded versus actual boost pressure with a scan tool under various load conditions to quantify the deviation.
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3
Perform a boost leak test by pressurizing the charge air system with the engine off to locate any leaks.
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4
Inspect the boost control solenoid for proper operation; check its electrical connector and resistance, then verify it responds to commanded duty cycles.
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5
Check the wastegate actuator diaphragm for cracks or leaks and verify the wastegate rod moves freely through its full range.
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6
Inspect the boost pressure sensor and its vacuum line for damage or blockage; compare its reading against a known-good gauge.
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7
Inspect the turbocharger for shaft play or bearing noise before condemning it as a performance-limiting component.
Related powertrain codes
Frequently asked questions
What is the difference between P00C6 and an over-boost or under-boost code?
Over-boost and under-boost codes indicate the measured pressure has exceeded or fallen below a fixed threshold. P00C6 performance means the closed-loop control system is unable to track the commanded target accurately, which may occur even within normal absolute pressure ranges.
Can a boost leak set P00C6?
Yes. A leak between the turbo outlet and the boost sensor causes the sensor to read lower than actual delivered boost, making the system appear unable to reach target pressure.
Will the engine go into limp mode with P00C6?
Many calibrations reduce boost limits when this code is active to protect the engine, resulting in noticeably reduced power. Check the vehicle-specific strategy for confirmation.
Does P00C6 damage the turbocharger?
The code itself does not, but the root cause such as worn bearings or wastegate flutter can accelerate turbo wear if left unaddressed.
Disabling P00C6 in software
RaceTune can permanently disable P00C6 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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