Intake Manifold Runner Position Sensor/Switch Circuit Intermittent Bank 2

What You Might Notice

• Check engine light illuminated
• Lack of engine power or acceleration
• Occasional misfires during operation
• Poor fuel economy
• Rough idle or hesitation

Most Common Causes

1. 1

   Sticking or faulty IMRC valve Bank 2

   The intake manifold runner control valve on Bank 2 may be stuck partially open or closed due to carbon buildup or mechanical failure, preventing proper airflow adjustment.

2. 2

   Faulty IMRC actuator or sensor Bank 2

   The actuator that controls the IMRC valve or the position sensor monitoring it has failed, causing incorrect signals to the PCM and improper valve operation.

3. 3

   Sticking or faulty throttle plates/body

   Carbon deposits or mechanical wear in the throttle body can cause valves to stick, restricting airflow and triggering the IMRC fault code.

4. 4

   Faulty Powertrain Control Module (PCM)

   Rarely, the PCM itself may malfunction or require reprogramming to properly control the IMRC system, though this is uncommon and diagnosed after other components are ruled out.

How to Diagnose It

1. 1

   Check Sticking or faulty IMRC valve Bank 2 — The intake manifold runner control valve on Bank 2 may be stuck partially open or closed due to carbon buildup or mechanical failure, preventing proper airflow adjustment.

2. 2

   Check Faulty IMRC actuator or sensor Bank 2 — The actuator that controls the IMRC valve or the position sensor monitoring it has failed, causing incorrect signals to the PCM and improper valve operation.

3. 3

   Check Sticking or faulty throttle plates/body — Carbon deposits or mechanical wear in the throttle body can cause valves to stick, restricting airflow and triggering the IMRC fault code.

4. 4

   Check Faulty Powertrain Control Module (PCM) — Rarely, the PCM itself may malfunction or require reprogramming to properly control the IMRC system, though this is uncommon and diagnosed after other components are ruled out.

How to Fix It

1. 1

   Clean or replace IMRC valve Bank 2

   Remove and inspect the intake manifold runner control valve on Bank 2. Clean carbon buildup with intake cleaner or replace if stuck or damaged beyond cleaning.

   IMRC Valve Bank 2↗Intake Manifold Gasket↗
2. 2

   Replace IMRC actuator Bank 2

   Test the IMRC actuator with a multimeter for resistance and solenoid function. Replace the actuator if it fails to respond to electrical signals or shows incorrect resistance values.

   IMRC Actuator Bank 2↗
3. 3

   Replace IMRC position sensor Bank 2

   Test the position sensor for proper voltage output across the full range of valve movement. Replace if sensor readings are erratic, stuck, or out of specification.

   IMRC Position Sensor Bank 2↗
4. 4

   Clean throttle body and inspect air intake

   Remove and clean the throttle body to remove carbon deposits that may affect airflow and IMRC system operation. Inspect intake manifold for leaks or damage.