The OBD-II trouble code P2019 indicates an issue with the Intake Manifold Runner Position Sensor/Switch Circuit in Bank 2 of your vehicle’s engine. This diagnostic trouble code is a generic powertrain code, meaning it’s commonly found in fuel-injected engines from various manufacturers post-2003, including Ford, Dodge, Toyota, Mercedes, Nissan, and Infiniti.
Essentially, code P2019 signals that the Powertrain Control Module (PCM) is detecting an abnormal reading from the Intake Manifold Runner Control (IMRC) system specifically for Bank 2. Bank 2 refers to the side of the engine opposite to cylinder number 1. The IMRC system, often involving a valve and sensor, is crucial for regulating airflow into the engine at different RPMs, optimizing engine performance and efficiency. This code can point to either a mechanical problem within the IMRC system or an electrical fault in the sensor circuit.
Alt text: Location of the Intake Manifold Runner Control (IMRC) valve on an engine intake manifold, highlighting its role in airflow management.
Symptoms of a P2019 Code
When your vehicle logs a P2019 code, you might experience several noticeable symptoms, including:
- Check Engine Light (Malfunction Indicator Lamp – MIL) Illumination: This is the most immediate and common symptom. The light turns on to alert you to a detected problem.
- Reduced Engine Power: The engine may feel sluggish, especially during acceleration, as the IMRC system malfunction can hinder optimal air intake.
- Occasional Engine Misfires: Improper air-fuel mixture due to IMRC issues can lead to sporadic misfires.
- Decreased Fuel Economy: An inefficient engine caused by IMRC problems can result in your vehicle consuming more fuel than usual.
Alt text: Dashboard view showing the Check Engine Light illuminated, a common indicator of OBD-II code P2019 and potential engine issues.
Common Causes of OBD-II Code P2019
Several factors can trigger a P2019 code. Pinpointing the exact cause requires a systematic diagnostic approach. Here are the typical culprits:
- Sticking or Faulty Throttle Plates/Body: Carbon buildup or mechanical issues can prevent the throttle plates from moving freely, impacting the IMRC system.
- Sticking or Faulty IMRC Valve (Bank 2): The IMRC valve itself might be sticking due to debris or wear, or it could be malfunctioning internally.
- Faulty IMRC Actuator/Sensor: The sensor that monitors the position of the IMRC valve can fail, sending incorrect data to the PCM.
- Rarely – Faulty Powertrain Control Module (PCM): While less common, a malfunctioning PCM could misinterpret sensor signals or incorrectly trigger the P2019 code.
Alt text: Close-up of an Intake Manifold Runner Control (IMRC) valve, demonstrating the component potentially responsible for OBD-II code P2019.
Diagnosing and Repairing Code P2019
Diagnosing a P2019 code effectively involves a step-by-step process. Here’s a guide for troubleshooting:
- Check for Technical Service Bulletins (TSBs): Always begin by checking for TSBs related to your specific vehicle make and model. Manufacturers often issue TSBs for known issues, which can save diagnostic time.
- Scan for Additional Diagnostic Trouble Codes: Use an OBD-II scanner to identify any other trouble codes present. Address any codes related to intake or engine performance systems first, as they might be interconnected with the P2019 issue. Intake or exhaust leaks can also mimic symptoms of a P2019 code, so rule those out.
- Visual Inspection of Wiring and Connectors: Locate the IMRC valve/sensor for Bank 2 on your engine. Carefully inspect the wiring and connectors for any signs of damage like chafing, rubbing, bare wires, or melted plastic. Examine the terminals inside the connectors for corrosion or damage. Clean corroded terminals with electrical contact cleaner or 91% rubbing alcohol and a soft brush. Apply dielectric silicone compound to the terminals before reconnecting.
- Clear Codes and Retest: After inspecting and cleaning connections, use a scan tool to clear the P2019 code and any other stored codes. Start the engine and see if the P2019 code returns. If it doesn’t, the issue might have been related to poor electrical connections.
- IMRC Sensor Voltage Testing: If the code reappears, you’ll need to test the IMRC valve/sensor voltage signals using a scan tool or a digital voltmeter (DVOM). Monitor the sensor voltage with the engine running and observe changes as you increase engine RPM. Compare the voltage readings to the manufacturer’s specifications for your vehicle.
- Mechanical Inspection of IMRC Valve: If the voltage test is inconclusive, physically inspect the IMRC valve. Disconnect the sensor/actuator and manually move the linkage or pin that controls the intake manifold plates/valves. Check for any binding, sticking, or excessive looseness in the movement. Resistance might be felt due to a return spring, which is normal. If binding or looseness is detected, the intake manifold itself might need replacement, a job best left to experienced technicians.
- IMRC Sensor/Actuator Replacement: If the mechanical inspection of the IMRC valve doesn’t reveal issues, the next step is to replace the IMRC sensor/actuator itself and retest the system.
Important Note: Accurate diagnosis requires addressing any other existing trouble codes first. If the diagnostic process becomes complex or involves intake manifold removal, it’s highly recommended to consult a certified automotive professional for repair. Improper repairs can lead to further engine performance issues.
Alt text: Automotive technician using an OBD-II scanner to diagnose a vehicle, essential for reading and clearing codes like P2019 during car repair.
Need Further P2019 Code Help?
For more in-depth assistance with diagnosing and resolving OBD-II code P2019, consider seeking advice from experienced mechanics or utilizing online car repair forums. Remember, this information is for informational purposes and not a substitute for professional repair advice. Always prioritize safety and consult qualified professionals when dealing with vehicle repairs.
Disclaimer: This information is for informational purposes only and should not be considered professional repair advice. We are not responsible for any actions taken based on this information.
