Intake Manifold Runner Position Sensor/Switch Circuit High Bank 2
The intake manifold runner control (IMRC) system on bank 2 is not positioning correctly, causing the PCM to detect an abnormal signal from the actuator or sensor. This prevents optimal air intake tuning, reducing engine efficiency and performance.
What You Might Notice
- Check engine light illuminated
- Reduced engine power or acceleration
- Poor fuel economy
- Rough idle
- Hesitation during acceleration
Most Common Causes
- 1
Faulty IMRC actuator bank 2
The intake manifold runner control actuator on bank 2 is stuck or malfunctioning, preventing the runner flaps from moving to their proper position. This causes the PCM to detect an out-of-range signal.
- 2
Faulty IMRC sensor bank 2
The position sensor monitoring the IMRC runner flaps on bank 2 is providing inaccurate feedback to the PCM. The sensor may be stuck, out of calibration, or internally damaged.
- 3
Failed IMRC actuator relay
The relay controlling power to the IMRC actuator on bank 2 is not engaging properly, cutting off power to the actuator motor or solenoid. This prevents the runners from moving.
- 4
PCM programming issue or failure
Rarely, the powertrain control module may have corrupted programming or internal failure that prevents proper IMRC control logic. This typically requires reflashing or module replacement.
How to Diagnose It
- 1
Check Faulty IMRC actuator bank 2 — The intake manifold runner control actuator on bank 2 is stuck or malfunctioning, preventing the runner flaps from moving to their proper position. This causes the PCM to detect an out-of-range signal.
- 2
Check Faulty IMRC sensor bank 2 — The position sensor monitoring the IMRC runner flaps on bank 2 is providing inaccurate feedback to the PCM. The sensor may be stuck, out of calibration, or internally damaged.
- 3
Check Failed IMRC actuator relay — The relay controlling power to the IMRC actuator on bank 2 is not engaging properly, cutting off power to the actuator motor or solenoid. This prevents the runners from moving.
- 4
Check PCM programming issue or failure — Rarely, the powertrain control module may have corrupted programming or internal failure that prevents proper IMRC control logic. This typically requires reflashing or module replacement.
How to Fix It
- 1
Inspect and replace IMRC actuator bank 2
Locate the intake manifold runner control actuator on the bank 2 side of the engine. Test it for mechanical binding or electrical continuity. If faulty, remove and install a new actuator assembly.
- 2
Test and replace IMRC position sensor bank 2
Access the IMRC position sensor on bank 2 and perform resistance and voltage tests according to manufacturer specifications. Replace the sensor if it reads out of range or does not respond to manual actuator movement.
- 3
Check IMRC actuator relay and wiring
Locate the IMRC actuator relay in the engine bay fuse/relay box. Test the relay by listening for a click when energized or using a multimeter. Inspect related wiring connectors for corrosion, loose pins, or damage. Replace relay or repair wiring as needed.
- 4
Clear code and perform system retest
After completing repairs, clear the diagnostic trouble code using a scanner. Start the engine and monitor IMRC function through live data to confirm proper operation. If code returns after all component repairs, PCM programming or replacement may be required.
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