P200B Intake Manifold Runner Performance Bank 2
OBD-II Trouble Code Technical Description
Intake Manifold Runner Performance Bank 2
What does that mean?
This is a generic diagnostic trouble code (DTC) and applies to many OBD-II vehicles (1996-newer). That may include but is not limited to vehicles from Hyundai, Kia, Mercedes Benz, Sprinter, Vauxhall, etc. Although generic, the exact repair steps may vary depending on year, make, model and powertrain configuration.
If your OBD II equipped vehicle has stored a code P200B, it means that the powertrain control module (PCM) has detected a problem with the intake manifold runner control (IMRC) system on bank 2. Code P200B applies explicitly to the bank of the engine that does not contain the #1 cylinder.
The IMRC system is designed to regulate and reconfigure intake air as it enters the engine. At lower engine RPM levels, airflow is restricted in order to reduce exhaust emissions. At higher engine RPM levels, a swirling effect is created by the IMRC flaps. This helps to optimize fuel atomization and maximize engine performance.
Typically, the IMRC system is composed of a series of metal flaps that are attached to a pivot rod which runs through the intake ports for each cylinder. Usually, all the flaps on one bank of the engine move in unison because they are all attached to a singular pivot rod; controlled by the same actuator. Each bank of the engine is outfitted with its own pivot rod, flaps, actuator, etc. which function independently of the other engine banks.
The PCM uses input data from numerous engine sensors to determine the desired degree at which IMRC system components should be implored. Once the PCM has applied the appropriate amount of voltage (to the correct circuit) for the desired IMRC adjustment, engine sensor data is monitored to see if the intended effect is realized.
If the PCM detects that the IMRC system cannot be controlled effectively, a code P200B will be stored and a malfunction indicator lamp may be illuminated.
What is the severity of this DTC?
Stored IMRC codes will typically result in wide open intake port flaps. The P200A should not be classified as severe but should be addressed at the earliest convenient opportunity.
What are some of the symptoms of the code?
Symptoms of a P200B trouble code may include:
Diminished fuel efficiency Reduced engine performance Lean or rich exhaust codes are stored Hesitation upon acceleration Stumble at idleWhat are some of the common causes of the code?
Causes for this code may include:
Broken or worn IMRC linkage or bushings Defective IMRC actuator Broken or collapsed IMRC vacuum lines Faulty IMRC vacuum supply actuator Open or shorted IMRC circuits or connectors Bad IMRC sensor or other engine sensor/sWhat are some P200B troubleshooting steps?
If mass airflow (MAF), manifold air pressure (MAP), or intake air temperature (IAT) codes are stored, these should be addressed before attempting to diagnose the stored P200B.
If you can locate a technical service bulletin (TSB) that matches the vehicle year, make, and model; as well as the engine size, code/s stored, and symptoms exhibited, it may yield helpful diagnostic information. A diagnostic scanner, a digital volt/ohmmeter (DVOM), a hand held vacuum pump, and a source of vehicle specific diagnostic information will be necessary to diagnose a code P200B.
I like to begin my diagnosis with a visual inspection of the IMRC system. I focus on mechanical linkage, vacuum lines and hoses, as well as electrical harnesses and connectors. Worn or damaged IMRC hardware, bushings, or linkage should be repaired or replaced before proceeding.
I would proceed by locating the vehicle diagnostic connector, plugging in the scanner, and retrieving all stored codes and pertinent freeze frame data. It’s a goo
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