What this code means

The IMRC for Bank 1 is stuck in the open position. This affects low-RPM torque and fuel economy as the manifold runners are optimized for high-RPM airflow.

Symptoms

• Check Engine Light
• Reduced low-RPM torque
• Poor fuel economy
• Slightly rough idle

Common causes

• Stuck IMRC actuator Bank 1
• Broken actuator rod or linkage
• Vacuum leak to actuator
• Failed IMRC solenoid

Diagnostic steps

1. Inspect IMRC actuator Bank 1
2. Check linkage and actuator rods
3. Test vacuum supply
4. Test IMRC solenoid operation

Repair notes

Replace IMRC actuator if stuck. Repair linkage. Fix vacuum supply.

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