Intake Manifold Runner Control Circuit Low Bank 2
P2012 indicates the intake manifold runner control (IMRC) solenoid circuit on bank 2 is reading a low voltage signal, preventing proper operation of the variable intake runners. This restricts airflow management and reduces engine performance, particularly at lower RPMs.
What You Might Notice
- Hesitation or stumbling upon acceleration
- Reduced engine power, especially 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 runner flaps has failed electrically or mechanically, preventing it from responding to control signals.
- 2
Open or shorted wiring in IMRC control circuit
Damaged, corroded, or disconnected wiring between the ECU and solenoid creates a low voltage condition in the circuit.
- 3
Loose or binding intake manifold runners bank 2
Physical obstruction, carbon buildup, or mechanical binding in the runner control linkage prevents proper positioning and creates excessive resistance.
- 4
Corroded IMRC solenoid connector or faulty position sensor
Corrosion on the solenoid connector terminals or a failed intake manifold runner position sensor creates poor electrical contact or incorrect feedback signals.
How to Diagnose It
- 1
Check Defective IMRC actuator solenoid bank 2 — The solenoid that controls the intake runner flaps has failed electrically or mechanically, preventing it from responding to control signals.
- 2
Check Open or shorted wiring in IMRC control circuit — Damaged, corroded, or disconnected wiring between the ECU and solenoid creates a low voltage condition in the circuit.
- 3
Check Loose or binding intake manifold runners bank 2 — Physical obstruction, carbon buildup, or mechanical binding in the runner control linkage prevents proper positioning and creates excessive resistance.
- 4
Check Corroded IMRC solenoid connector or faulty position sensor — Corrosion on the solenoid connector terminals or a failed intake manifold runner position sensor creates poor electrical contact or incorrect feedback signals.
How to Fix It
- 1
Inspect and repair IMRC wiring and connector
Check the wiring harness and connector between the ECU and IMRC solenoid on bank 2 for corrosion, damage, or loose connections. Clean corroded terminals with electrical cleaner and reseat connections firmly.
- 2
Replace IMRC actuator solenoid bank 2
If wiring is intact, the solenoid itself is likely failed. Remove the solenoid from the intake manifold and install a new OEM or quality replacement.
- 3
Clean carbon buildup from intake manifold runners
Remove the intake manifold or access the IMRC flaps and runners to remove carbon deposits that may be binding the mechanical linkage. Use carburetor cleaner and soft brushes carefully.
- 4
Test and replace intake manifold runner position sensor if needed
Use a multimeter to check the position sensor resistance and signal output. If readings are out of specification, replace the sensor and verify the code clears.
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