Code
P2006
Generic
P — Powertrain
Intake Manifold Runner Control Stuck Closed Bank 1
AI status
Completed
Completed
100%
Causes
- Carbon or sludge buildup preventing runner movement
- Faulty IMRC actuator (vacuum, electric motor, or solenoid)
- Broken or seized linkage, lever or pivot
- Vacuum supply failure (hose leak, failed vacuum solenoid)
- Wiring fault or connector corrosion at actuator or position sensor
- Faulty intake manifold runner position sensor (if equipped)
Symptoms
- Check Engine light (Malfunction Indicator Lamp) illuminated
- Reduced engine power and torque, especially at certain RPM ranges
- Rough idle or hesitation on acceleration
- Poor fuel economy
- Possible surging or stumble during throttle transitions
- Engine may enter reduced power / limp mode on some vehicles
What to check
- Read codes and freeze-frame data with a scan tool; confirm P2006 and note conditions when set
- Check for related codes (other IMRC or vacuum-related codes)
- Perform a visual inspection of intake manifold area: vacuum lines, actuator, connectors and linkages
- Using a scan tool, command the IMRC open and closed and observe actual response or position PID
- Inspect vacuum supply: check hoses, fittings, and vacuum source for leaks or loss of vacuum
- Manually operate actuator (apply vacuum or battery power per manufacturer procedure) to verify movement
Signal parameters
- Commanded position vs actual position PID should change when IMRC is commanded (percent or angle)
- Actuator electrical: motor/solenoid voltage should respond to commands (design dependent; typically 0–12V or PWM duty cycle)
- Position sensor (if present): voltage typically varies with position (commonly ~0.5–4.5 V range)
- Vacuum-actuated systems: engine vacuum at idle commonly present (engine vacuum around ~15–22 inHg) and vacuum at actuator should hold under command
- Response time: runner should move within a few seconds after command; no motion indicates fault
Diagnostic algorithm
- Confirm the code and note freeze-frame / driving conditions when fault occurred
- Inspect: visually check vacuum lines, actuator, connectors and wiring for damage or disconnection
- Using a scan tool, command the IMRC to open and closed while monitoring position PID or listening/observing movement
- Check vacuum supply (for vacuum actuators): apply vacuum with hand pump to actuator and see if runner moves and holds vacuum
- For electric actuators: check power and ground at the actuator when commanding; measure actuator resistance per service data
- Manually operate linkage (per safe manufacturer procedure) to determine if mechanical binding or carbon is preventing movement
- If actuator responds electrically but runners do not move, remove intake manifold or access port and inspect runners and pivots for carbon, debris, or broken components; clean or repair as needed
- If actuator fails to respond to commands and wiring checks good, bench-test or replace the actuator/solenoid
- After repairs, clear codes and road-test to confirm IMRC operates correctly and code does not return
- If repeated faults with correct operation, consider module/software verification or replacement as last resort
Likely causes
- Carbon deposits or soot jamming the runner
- Failed actuator (vacuum diaphragm torn or motor seized)
- Disconnected or leaking vacuum line to the actuator
- Broken linkage or seized pivot bearing
- Faulty position sensor or poor electrical connection
Fault status
Status
Intake Manifold Runner Control (IMRC) - Stuck Closed - Bank 1
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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