Intake Manifold Runner Control Circuit High Bank 2
The intake manifold runner control (IMRC) circuit on bank 2 is detecting an abnormally high voltage signal, indicating a malfunction in the variable intake manifold system. This system optimizes air intake volume across different engine speeds, and the fault prevents proper operation.
What You Might Notice
- Hesitation or stumbling during acceleration
- Reduced engine power, particularly at low RPM
- Engine surge or surging at idle
- Diminished fuel economy
- Rich or lean exhaust condition
Most Common Causes
- 1
Defective IMRC actuator solenoid bank 2
The solenoid that controls the intake manifold runner flaps is electrically faulty or stuck, causing incorrect voltage signals to the PCM.
- 2
Open or shorted wiring in IMRC control circuit
Damaged, corroded, or loose wiring harness between the solenoid and engine control module creates high resistance or electrical faults.
- 3
Corroded IMRC actuator solenoid connector
Connector face corrosion or oxidation increases electrical resistance, generating abnormal voltage readings.
- 4
Carbon buildup on IMRC flaps or intake ports bank 2
Excessive carbon deposits cause the intake runner flaps to stick or bind, disrupting proper operation and solenoid feedback signals.
How to Diagnose It
- 1
Check Defective IMRC actuator solenoid bank 2 — The solenoid that controls the intake manifold runner flaps is electrically faulty or stuck, causing incorrect voltage signals to the PCM.
- 2
Check Open or shorted wiring in IMRC control circuit — Damaged, corroded, or loose wiring harness between the solenoid and engine control module creates high resistance or electrical faults.
- 3
Check Corroded IMRC actuator solenoid connector — Connector face corrosion or oxidation increases electrical resistance, generating abnormal voltage readings.
- 4
Check Carbon buildup on IMRC flaps or intake ports bank 2 — Excessive carbon deposits cause the intake runner flaps to stick or bind, disrupting proper operation and solenoid feedback signals.
How to Fix It
- 1
Inspect and clean IMRC solenoid connector
Disconnect the solenoid connector on bank 2 and clean any corrosion or dirt from the connector faces using electrical contact cleaner and a soft brush. Reconnect and test.
- 2
Replace IMRC actuator solenoid bank 2
Remove and replace the defective solenoid valve on the intake manifold for bank 2. This is the most common repair for this code.
- 3
Check and repair IMRC wiring harness
Inspect the control circuit wiring for breaks, corrosion, or loose connections. Repair or replace damaged sections of the harness as needed.
- 4
Clean intake manifold and IMRC flaps
Remove the intake manifold and clean carbon buildup from the runner control flaps and ports using carburetor cleaner or intake cleaner. Ensure flaps move freely.
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