P2019 indicates a malfunction in the intake manifold runner position sensor/switch circuit for bank 2. The PCM detects an abnormal voltage or signal from the sensor that monitors the position of the intake runner control valves, which adjust airflow for optimal performance and emissions.
The sensor itself is the most common failure point. Internal shorts, opens, or degradation cause incorrect signal to the PCM.
Damaged, corroded, or loose wiring/connectors in the sensor circuit can cause intermittent or permanent circuit faults.
Excessive carbon deposits can physically bind the runner flaps, causing the sensor to read out of range or stick.
On some engines, a separate actuator moves the flaps; if it fails, the sensor may report incorrect position.
The powertrain control module itself is very unlikely to cause this code. Only consider after thoroughly checking all other components.
You may be able to drive short distances, but reduced power and poor drivability are common. Continued driving could lead to further issues like carbon buildup or catalytic converter damage if the runner control is stuck in a suboptimal position.
The most common causes are carbon buildup on the runner flaps, electrical connector corrosion, or internal sensor failure due to age and heat cycling. Wiring damage from engine vibration or rodent activity is also possible.
No. The PCM is almost never the cause of this code. The problem is almost always in the sensor, wiring, or mechanical binding of the intake runner flaps. Replacing the PCM without proper diagnosis is a waste of time and money.
It can be moderately serious. While the vehicle may still run, the intake runner control system is designed to optimize airflow for fuel economy and emissions. A malfunction can lead to reduced performance, increased emissions, and potential damage to the catalytic converter if ignored.