Intake Manifold Runner Control Stuck Open Bank 1
The Intake Manifold Runner Control (IMRC) solenoid for Bank 1 is stuck in the open position, preventing proper adjustment of intake manifold runner length. This reduces engine efficiency, particularly at low RPM, and triggers the check engine light.
What You Might Notice
- Reduced engine performance, especially at low RPM
- Diminished fuel efficiency
- Engine surge or hesitation
- Check engine light illuminated
- Rough idle
Most Common Causes
- 1
Defective IMRC actuator solenoid
The solenoid controlling the intake manifold runners has failed internally, preventing it from closing properly. This is the most common cause of this code.
- 2
Corroded or loose solenoid connector
Corrosion or loose connection at the IMRC solenoid connector prevents proper electrical signal transmission. Cleaning or reseating the connector may resolve the issue.
- 3
Intake manifold runner position sensor failure
A faulty runner position sensor sends incorrect feedback signals, causing the PCM to register the runners as stuck open even when functioning normally.
- 4
Open or shorted wiring in IMRC control circuit
Damaged wiring or broken connections in the solenoid control circuit prevent proper electrical operation of the IMRC system.
How to Diagnose It
- 1
Check Defective IMRC actuator solenoid — The solenoid controlling the intake manifold runners has failed internally, preventing it from closing properly. This is the most common cause of this code.
- 2
Check Corroded or loose solenoid connector — Corrosion or loose connection at the IMRC solenoid connector prevents proper electrical signal transmission. Cleaning or reseating the connector may resolve the issue.
- 3
Check Intake manifold runner position sensor failure — A faulty runner position sensor sends incorrect feedback signals, causing the PCM to register the runners as stuck open even when functioning normally.
- 4
Check Open or shorted wiring in IMRC control circuit — Damaged wiring or broken connections in the solenoid control circuit prevent proper electrical operation of the IMRC system.
How to Fix It
- 1
Inspect and clean IMRC solenoid connector
Remove the connector from the IMRC solenoid and inspect for corrosion, debris, or bent pins. Clean thoroughly with electrical contact cleaner and reinstall firmly. Test for proper connection.
- 2
Replace IMRC actuator solenoid
Remove the intake manifold or access the IMRC solenoid assembly. Disconnect the electrical connector and any fasteners, then install a new solenoid. Reconnect and clear codes to verify repair.
- 3
Test and replace intake manifold runner position sensor
Locate the runner position sensor on the intake manifold. Use a multimeter to test sensor resistance and voltage output. Replace if readings are out of specification.
- 4
Inspect and repair IMRC wiring harness
Trace the wiring from the solenoid to the PCM connector. Look for damaged insulation, broken wires, or corroded connections. Repair or replace damaged sections of the harness.
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