Faulty or drifting MAP sensor or turbo inlet pressure sensor; Blocked, collapsed or leaking pipe or hose to a pressure sensor; Air leak in the intake or charge air system between the turbo inlet and the manifold; Wiring or connector fault such as corrosion, chafing, high resistance or a poor earth or reference voltage; Restricted air filter or inlet duct affecting the pressure at the turbo inlet; Turbocharger, wastegate or boost control fault causing abnormal pressure; Fault in the engine control unit or outdated software where the manufacturer has issued an update.

P006C

MAP - Turbocharger/Supercharger Inlet Pressure Correlation.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
0: AreaFuel and air metering, auxiliary emission controls
6C: FaultThe specific fault in that area

What it means

P006C is the generic code for a correlation fault between the manifold absolute pressure (MAP) reading and the turbocharger or supercharger inlet pressure reading. The engine control unit compares the two signals under conditions where they should agree, such as key on engine off or at low boost, and sets the code when they differ by more than the allowed amount. It points to a sensor, wiring or air path problem rather than naming one part.

Symptoms

Engine warning light on
Loss of power or limp mode
Poor or inconsistent boost
Hesitation or rough running under load
Higher fuel consumption
Turbo overboost or underboost codes stored alongside

Possible causes

Faulty or drifting MAP sensor or turbo inlet pressure sensorlikely
Blocked, collapsed or leaking pipe or hose to a pressure sensorlikely
Air leak in the intake or charge air system between the turbo inlet and the manifoldlikely
Wiring or connector fault such as corrosion, chafing, high resistance or a poor earth or reference voltagepossible
Restricted air filter or inlet duct affecting the pressure at the turbo inletpossible
Turbocharger, wastegate or boost control fault causing abnormal pressurepossible
Fault in the engine control unit or outdated software where the manufacturer has issued an updaterare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting load, engine speed and boost at the time the fault set.
Inspect the air filter, inlet ducting, charge air hoses, clamps and intercooler for damage, oil contamination, splits or loose joints.
Check both pressure sensors and their connectors for damage, moisture, corrosion and loose pins, and inspect the wiring for chafing.
With the key on and engine off, compare live MAP and turbo inlet pressure readings against each other and against atmospheric pressure; they should closely agree.
Check the sensor reference voltage, signal and earth at the connector against the manufacturer's specification.
Smoke test or pressure test the intake and charge air system to find leaks.
Compare live readings at idle and under load, and check boost control actuator operation, as the procedure varies by model and engine.
Swap or substitute a known good sensor only after the wiring and air path have been proven sound.

How to fix

Replace the faulty MAP or turbo inlet pressure sensor.
Repair or replace any cracked, blocked or disconnected pressure sensing hose.
Fix intake or charge air leaks by replacing split hoses, seals or clamps.
Repair damaged wiring or connectors and restore good earth and reference supply.
Replace a blocked air filter or clear the inlet restriction.
Repair or replace the turbocharger or boost control components if testing shows they are at fault, or apply a manufacturer software update if one is specified for this fault.

Can I keep driving?

Medium severity

The car can usually be driven gently for a short time, but power may be reduced and the engine may go into limp mode. Get it checked soon, as an underlying boost or air leak problem can worsen and risk the turbo.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.