P2019 – Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance (Bank 2)

Urgency and Driving Considerations

The P2019 code indicates a problem with the intake manifold runner control (IMRC) system on bank 2 (the side of the engine that does not contain cylinder #1). With this code, the vehicle can typically still be driven safely to a repair shop. The engine may have decreased performance, rough idling, and reduced fuel economy. While not an emergency, it's best to diagnose and repair this issue promptly to restore proper engine operation and prevent potential catalytic converter damage from unburned fuel.

Code Details

P2019 is a generic powertrain code that applies to many vehicles with electronically controlled intake manifolds, especially those made since 2003. The exact definition and diagnostic steps may vary somewhat between makes and models. This code is specific to bank 2. A similar code P2004 indicates an IMRC issue on bank 1.

Parts and Operation

The IMRC system includes:

IMRC valves/plates: These are flaps inside the intake manifold that open and close to vary the length of the intake runners.

IMRC actuators: Vacuum or electric motors that physically move the valves/plates based on commands from the ECU.

IMRC position sensors: These monitor the actual position of the valves and report back to the ECU.

The ECU commands the IMRC actuators to adjust the valve positions based on factors like engine RPM and load. This optimizes air velocity and volumetric efficiency for improved performance, emissions, and fuel economy.

Common Causes

• Sticking or faulty IMRC valves/plates
• Faulty IMRC actuator or position sensor
• Damaged wiring or poor electrical connections in the IMRC circuit
• Intake manifold vacuum leaks
• Rarely, a faulty ECU (engine control unit)

Diagnostic Steps

1. Scan for other codes, especially those relating to the intake manifold, IMRC system, or mass airflow sensor. Fix those issues first.
2. Visually inspect the wiring and electrical connections to the IMRC actuators and sensors. Repair as needed.
3. Using a scan tool or oscilloscope, observe the IMRC position sensor signals while revving the engine. The signal should change smoothly.
4. Test the IMRC actuator operation using a scan tool bi-directional controls (if available).
5. If the actuators and sensors test okay, physically check the IMRC valves for binding or sticking. This requires removing the intake manifold on most engines.

Repairs and Cost

Cleaning or replacing the IMRC valves often requires intake manifold removal and replacement. Parts and labor can run $500-1000+ depending on engine design. Replacing a faulty IMRC actuator or position sensor typically costs $200-400 for parts and labor. Wiring repairs are generally inexpensive ($100-200) unless there is extensive harness damage.

Prevention

• Maintain the engine air filter to prevent contaminants from causing IMRC valves to stick
• Address intake manifold vacuum leaks promptly, as they can allow unmetered air to enter and cause IMRC issues
• Follow the manufacturer's recommended service intervals for spark plugs, ignition system, and fuel injectors to maintain an efficient burn and prevent excess hydrocarbons from clogging the IMRC valves over time

Related Codes

Other faults that commonly occur alongside P2019 include:

• P2004 (IMRC fault on bank 1)
• P0101-P0103 (mass air flow sensor issues)
• P0171-P0175 (lean fuel trim codes)
• P0300-P0308 (cylinder misfire codes)

Resolving these related faults is important for an accurate diagnosis of the root cause of P2019 and to prevent a recurrence.

Frequently Asked Questions About P2019 Code

What does the P2019 code mean?

The P2019 code indicates a problem with the intake manifold runner control (IMRC) system on bank 2 (the side of the engine that does not contain cylinder #1). Specifically, it points to an issue with the intake manifold runner position sensor or switch circuit.

Is it safe to drive with a P2019 code?

In most cases, you can drive the vehicle safely to a repair shop when the P2019 code is present. However, you may experience decreased engine performance, rough idling, and reduced fuel economy. It’s best to diagnose and repair the issue promptly.

What are the common symptoms of a P2019 code?

Common symptoms include:

• Check Engine Light illuminated
• Decreased engine performance
• Rough idling
• Poor fuel economy

What causes a P2019 code?

Potential causes of a P2019 code include:

• Sticking or faulty IMRC valves/plates
• Faulty IMRC actuator or position sensor
• Damaged wiring or poor electrical connections in the IMRC circuit
• Intake manifold vacuum leaks
• Rarely, a faulty ECU (engine control unit)

How do you diagnose a P2019 code?

Key diagnostic steps include:

1. Scan for other codes and fix those first
2. Visually inspect wiring and connections
3. Observe IMRC position sensor signals with a scan tool while revving the engine
4. Test IMRC actuator operation with bi-directional controls
5. Physically check IMRC valves for binding or sticking

Can a vacuum leak cause a P2019 code?

Yes, an intake manifold vacuum leak can allow unmetered air to enter the engine, potentially triggering a P2019 code. Vacuum leaks should be diagnosed and repaired as part of the troubleshooting process.

How much does it cost to fix a P2019 code?

The cost to repair a P2019 code varies widely depending on the root cause. Cleaning or replacing the IMRC valves can cost $500-1000+ if the intake manifold needs to be removed. Replacing a faulty sensor or actuator typically runs $200-400. Minor wiring repairs are usually inexpensive.

Can I diagnose a P2019 code myself?

Diagnosing a P2019 code can be complex, often requiring specialized tools like a scan tool with bi-directional controls. While some basic checks can be done at home, it’s generally best to have the vehicle diagnosed by a professional mechanic.

What happens if I ignore a P2019 code?

Ignoring a P2019 code can lead to increased emissions, reduced fuel economy, and potentially damage the catalytic converter over time due to unburned fuel. The engine will continue to run poorly until the underlying issue is addressed.

How long does it take to fix a P2019 code?

The repair time for a P2019 code depends on the specific cause. Replacing a faulty sensor or actuator can often be done in a few hours. However, if the intake manifold needs to be removed to access the IMRC valves, the repair can take significantly longer.

Can a weak battery cause a P2019 code?

While a weak battery itself is unlikely to directly cause a P2019 code, it can lead to other issues that may trigger the code. For example, low voltage can cause erratic behavior in sensors and actuators. Always ensure the battery is fully charged and in good condition.

Can a P2019 code clear itself?

In some cases, a P2019 code may clear itself if the underlying issue was intermittent and has stopped occurring. However, it’s unwise to assume the problem has resolved itself. Diagnosing the root cause is still important to prevent the issue from returning.

What is an IMRC system?

IMRC stands for Intake Manifold Runner Control. This system uses valves or plates inside the intake manifold to vary the length of the intake runners. By optimizing the airflow dynamics, the IMRC system helps improve engine performance, emissions, and fuel efficiency.

How often do IMRC valves need to be cleaned?

There is no specific maintenance schedule for cleaning IMRC valves. However, over time, carbon buildup from the combustion process can cause the valves to stick or bind. Regular use of high-quality fuel and keeping up with routine engine maintenance can help minimize carbon accumulation.

Can aftermarket parts cause a P2019 code?

In some cases, yes. Aftermarket intake or exhaust components that change the airflow characteristics of the engine can lead to issues with the IMRC system. Stick with high-quality, vehicle-specific parts and have any modifications done by a reputable shop.

What is bank 2 in a P2019 code?

Bank 2 refers to the side of the engine that does not contain cylinder #1. In a V6 or V8 engine, the cylinders are typically divided into two banks. A P2019 code specifically indicates an issue with the IMRC system on bank 2.

Can a P2019 code affect other engine systems?

Yes, the root cause of a P2019 code can potentially affect other engine systems. For example, vacuum leaks or intake manifold issues can lead to lean running conditions, which may trigger fuel trim codes or cause misfires. Fixing the underlying issue is crucial for overall engine health.

How do I prevent a P2019 code from coming back?

To prevent a P2019 code from recurring:

• Address the root cause, not just the symptoms
• Use high-quality replacement parts
• Ensure all wiring and connections are secure
• Keep up with routine engine maintenance
• Use a high-quality fuel system cleaner periodically

Can a P2019 code trigger limp mode?

In some vehicles, a P2019 code may trigger a failsafe or “limp” mode to protect the engine from potential damage. This mode typically limits engine RPM and performance. While the vehicle can still be driven, it should be diagnosed and repaired as soon as possible.

Is a P2019 code a common problem?

The frequency of P2019 codes varies by vehicle make and model. Some engines with complex IMRC systems may be more prone to issues over time. However, with proper maintenance and prompt attention to any issues, most vehicles can avoid serious problems related to the P2019 code.