|Trouble Code||Fault Location||Probable Cause|
|P2019||Intake manifold air control actuator position sensor/switch, bank 2 - circuit malfunction||Wiring, intake manifold air control actuator position sensor/switch|
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What Does Code P2019 Mean?
OBD II fault code P2019 is a generic code that is defined as “Intake manifold air control actuator position sensor/switch, bank 2 – circuit malfunction”and is set when the PCM (Powertrain Control Module) detects a failure or malfunction either in the IMRC (Intake Manifold Runner Control) system position switch/sensor itself, or in the electrical circuit that that communicates the position of the intake runner flaps to the PCM. “Bank 2” refers to the IMRC control system on the bank of cylinders that does not contain cylinder #1.
Note that while code P2019 refers specifically to issues in the electrical circuits that are directly associated with the IMRC position sensor/switch and not to general mechanical failures/issues in the system, some mechanical failures in the IMRC system can cause electrical circuits to fail. An example of this would be when sticky or binding runner flaps causes one or more fuses to blow, which would result in an open circuit.
NOTE #1: The IMRC should not be confused with a similar system that tweaks or controls inlet manifold dynamics, which effectively changes the length of individual manifold runners. Since the IMRC system controls the motion of the intake air inside the inlet manifold, the ISO/SAE recommended term for this system is “Intake Manifold Runner Control System”(IMRC), to avoid confusion, although this system is sometimes also known as the Swirl Control System/Valve or the Charge Motion Control System/Valve.
NOTE #2: Similarly, the ISO/SAE recommends that all systems/devices that control, regulate, tweak, or alter the dynamics(length, shape, or diameter) of inlet manifold runners be referred to as the “Intake Manifold Tuning (IMT) Valve”, although this system is sometimes also known as the Intake Manifold Tuning Valve, Long/Short Runner Control, or Intake Manifold Communication Control.
The purpose of the intake manifold runners is to improve the airflow inside the intake manifold by creating a restriction in the manifold at low engine speeds, both to improve engine efficiency at low engine speeds, and to reduce harmful exhaust emissions. Since combustion is typically less efficient at low engine speeds, creating a partial restriction in each manifold runner increases the airflow rate through the runners, which has the effect of eliminating manifold pressure fluctuations that are caused by the opening and closing of the inlet valves during normal engine operation.
In terms of operation, the IMRC system uses individual flaps in each manifold runner that are all connected to a control rod that runs the length of the inlet manifold. The control rod is connected to an actuator that can be eclectically or vacuum operated; by activating the actuator, all the flaps in the manifold move by the same amount. Note however, that the runner flaps never close off the runners completely; depending on the application, most systems only close off around 60% of the diameter of the inlet manifold runners.
To control and monitor the position of the manifold runner flaps, the PCM uses input data from the MAF (Mass Airflow) sensor, barometric pressure sensor, engine speed sensor, IAT (Intake Air Temperature) sensor, TPS (Throttle Position) sensor(s), and others to calculate an appropriate setting for the manifold runner flaps to suit current operating conditions. To be sure that the desired and actual positions of the runner flaps coincide, the PCM also uses input data from a dedicated position switch that communicates the actual position of the runner flaps to the PCM via a dedicated signal circuit.
From the above it should be obvious that effective communication between the PCM, the IMRC system actuator, and the IMRC system position switch is vital for the correct operation of the system, since IMRC flaps generally do not have a default open position. In practice, this means that if the system fails in the closed position, it will remain in that position until the failure is corrected.
Therefore, as soon as the PCM detects a failure in an electrical circuit that is directly associated with the IMRC position sensor/switch, or a failure of the position sensor itself that prevents effective communication between the PCM and the position sensor/switch, it will set code P2019 and illuminate a warning light.
Where is the P2019 sensor located?
The image above shows the typical appearance of an IMRC system, but note that in this instance, the system is operated by a vacuum controlled actuator, which is indicated by the yellow arrow. The green arrow indicates the electrical connector of the position switch, the red arrows indicate individual runner flaps, and the blue arrow indicates the linkage that connects the actuator to the control rod.
Note though that depending on the application, the actual design, appearance, layout, and arrangement of individual components may differ greatly from the example shown here. For this reason, it is important to refer to the manual for the affected application to locate and identify parts/components correctly- failure to do this will almost certainly result in confusion, wasted time, misdiagnoses, and the unnecessary replacement of parts and components.
What are the common causes of code P2019?
It should be noted that while code P2019 refers specifically to electrical failures/issues in circuits that are directly related to the IMRC system position switch/sensor, some mechanical failures in the system could cause issues such as open circuits. Therefore, if an inspection of the electrical control circuit does not reveal the root cause of the code, it may become necessary to remove the inlet manifold from the engine to inspect the mechanical components for inspection, testing, or cleaning/replacement of parts. Nonetheless, some common causes of code P2019 could include the following-
- Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors
- Blown fuses, which could be caused by runner flaps that are sticky, binding, or frozen in position due to the presence of carbon deposits on the flaps themselves
- Defective IMRC position switch
- Failed or failing PCM. Note that this is a rare event, and the fault must therefore be sought elsewhere before any control module is replaced
NOTE: It should be noted that while the causes listed above are the most common, failures of, and defects in associated sensors and their control circuits can sometimes cause, or contribute to the setting of code P2019. However, since these defects and failures will almost invariably be indicated by codes that relate directly to the failure, it is important to resolve all additional codes in the order in which they were stored to prevent a misdiagnosis, and possibly the unnecessary replacement of parts and components.