The P2006 code on your 2023 Buick Enclave indicates the intake manifold runner control (IMRC) for bank 1 is stuck in the closed position. This code affects your Enclave's 3.6L V6 engine's variable intake system, reducing engine performance and efficiency at higher RPMs.
Understanding P2006 on Buick Enclave
The intake manifold runner control uses valves to change the effective length of intake runners based on engine speed. Closed runners provide better low-RPM torque, while open runners allow more airflow at high RPM. Code P2006 sets when the PCM commands runners open but the position sensor indicates they remain closed.
Common Symptoms
- Check engine light on
- Reduced high-RPM power
- Engine feels sluggish at highway speeds
- Possible hesitation during hard acceleration
- May notice change in engine sound
- Slightly reduced fuel economy
- Normal low-speed operation
Primary Causes
- IMRC actuator motor failure
- Stuck or binding intake manifold valves
- Carbon buildup on runner valves
- Broken linkage in runner system
- IMRC position sensor fault
- Wiring issues to actuator
- Vacuum leak affecting vacuum-operated systems
Diagnostic Procedure for 2023 Enclave
Using a GM scan tool, command IMRC operation and observe position sensor feedback. If no position change occurs when commanded open, actuator or mechanical binding is likely. Listen for actuator motor operation when commanded. Visually inspect intake runners if possible - they should move when commanded. Check for carbon buildup on valve edges. Test actuator motor operation with direct voltage if accessible.
Repair Solutions
If carbon buildup is preventing valve movement, carefully clean the intake manifold valves with approved intake cleaner. Replace failed IMRC actuator motor. Repair broken linkage components. If valves are physically damaged, intake manifold replacement may be needed. After repairs, clear codes and verify proper runner movement when commanded during driving.