P006C MAP - Turbocharger/supercharger inlet pressure correlation

OBD-II DTC Datasheet

MAP - Turbocharger/Supercharger Inlet Pressure Correlation

What does this mean?

This Generic Powertrain Diagnostic Trouble Code (DTC) is commonly applied to many OBD-II vehicles. This may include but is not limited to Toyota, Dodge, Chrysler, Fiat, Sprinter, VW, Mazda, etc.

A stored P006C code means the powertrain control module (PCM) has detected a mismatch in the correlated signals between the manifold absolute pressure (MAP) sensor and the turbocharger / supercharger inlet pressure sensor.

In some vehicles, the MAP sensor can be described as an atmospheric pressure sensor. Obviously, the P006C code only applies to vehicles with forced air systems.

Other stored MAP or forced air intake system codes must be diagnosed and repaired before attempting to diagnose the P006C code.

Manifold absolute pressure (air density) is measured in either kilopascals (kPa) or inches of mercury (Hg) using a MAP sensor. These measurements are entered into the PCM as voltages of varying degrees. The MAP and barometric pressure signals are measured in the same increments.

The turbocharger / supercharger inlet pressure sensor is usually similar in design to the MAP sensor. It also controls the density of the air. It is most commonly located inside the turbocharger / supercharger inlet hose and provides the PCM with an appropriate voltage signal that reflects it.

If the voltage input signals (between the MAP sensor and the turbocharger / supercharger inlet pressure sensor) differ by more than a programmed degree (over a period of time and under certain circumstances), a P006C code will be stored and the Malfunction Indicator Lamp (MIL) may be illuminated.

In some vehicles, MIL illumination may require multiple driving cycles (with a malfunction). The exact parameters for storing the code (as they are specific to the vehicle in question) can be obtained by consulting a reliable vehicle information source (e.g. AllData DIY).

What is the severity of this DTC?

Engine performance, handling, and fuel efficiency are likely to be hampered by conditions that favor the storage of a P006C code. It needs to be resolved urgently.

What are some of the symptoms of the code?

Symptoms of a P006C engine code may include:

Reduced engine power
Reduced fuel efficiency
Oscillation or delay in motor acceleration
Rich or poor condition
Louder than normal hiss / suction noise when accelerating

What are some of the common causes for the code?

Reasons for this engine code may include:

Defective MAP sensor
Faulty turbocharger / supercharger inlet pressure sensor
Open or short circuit in the wiring or connector
Insufficient vacuum in the engine
Limited air flow
PCM or PCM programming error

What are some steps to troubleshoot the P006C?

I would start by visually inspecting all the wiring and connectors of the MAP sensor and the turbocharger inlet pressure sensor. I would also like to make sure the turbocharger / supercharger inlet hoses are in good condition and in good working order. I would inspect the air filter. It should be relatively clean and unobstructed.

When diagnosing a P006C code, I will need a hand-held vacuum gauge, a diagnostic scanner, a digital volt / ohm meter (DVOM), and a source of reliable vehicle information.

A reasonable precursor to any MAP-related code is to manually check engine intake vacuum pressure. Use a vacuum gauge and get specification instructions from your vehicle information source. If the vacuum in the engine is insufficient, there is an internal engine fault that must be repaired before proceeding.

Now I would connect the scanner to the car diagnostic port and get all stored codes and freeze frame data. Freeze frame data provides an accurate picture of the circumstances that occurred at the time of the fault that led to the stored P006C code. I would write this information down as it may be helpful as my diagnosis progresses. I would then clear the codes and test drive the car to see if the code is cleared.

If this:

Use the DVOM to check the reference signal (typically 5 volts) and ground at the MAP sensor and turbocharger / supercharger inlet pressure sensor connectors.
This can be done by connecting the positive test lead of the DVOM to the reference voltage pin of the sensor connector and the negative test lead to the ground pin of the connector.

If an appropriate degree of voltage and ground reference is found:

I would test the MAP sensor and the turbocharger / supercharger inlet pressure sensor using the DVOM and my vehicle information source.
The vehicle information source should include wiring diagrams, connector types, connector pinout and diagnostic block diagrams, and component test specifications.
Test individual transducers while disconnected, with the DVOM set to the resistance setting.
MAP and / turbocharger / supercharger inlet pressure sensors that do not meet manufacturer's specifications should be considered defective.

If the corresponding sensors meet the manufacturer's specifications:

With the key on and the engine running (KOER), reconnect the sensors and use the DVOM to check the signal circuit wiring of the individual sensors directly behind the corresponding sensor connectors.
To determine if the signals from the corresponding sensors are correct, follow the air pressure and voltage charts (which should be located in the vehicle information source).
If any of the sensors does not display a voltage level that is within the manufacturer's specifications (based on manifold absolute pressure and turbocharger / supercharger boost pressure), assume that the sensor is faulty.

If the correct signal from the MAP sensor and the turbocharger / supercharger intake pressure sensor is present:

Access the PCM and test the appropriate signal circuit (for each sensor in question) at the (PCM) connector. If there is a sensor signal on the sensor connector that is not on the PCM connector, suspect an open circuit between the two components.
You can turn off the PCM (and all associated controllers) and test individual system circuits using the DVOM. Follow the connection diagrams and connector pinout diagrams to check the resistance and / or continuity of an individual circuit.

Suspected PCM failure or PCM programming error if all MAP / turbocharger / supercharger inlet pressure sensors and circuits are within specification.

Finding the appropriate technical service bulletins (TSBs) can help a lot in your diagnosis.
The turbocharger / supercharger inlet pressure sensor often remains disconnected after changing the air filter and other related maintenance. If the vehicle in question has recently been serviced, check this connector first.

Related DTC discussions

VW Vento TDi P006C 00 starts but won't startHello, I ran into a serious problem, when driving a car, power was lost, the revolutions stalled and did not start after cranking. Error code P00C6 00 [100] Minimum pressure not reached. What could be the problem? Thanks Jay ...

Need more help with a P006C code?

If you still need help with DTC P006C, post a question in the comments below this article.

NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.