P1522 IMRC Position Sensor Bank 2 Fault
The P1522 code indicates that the Powertrain Control Module (PCM) has detected an invalid or out-of-range input signal from the Intake Manifold Runner Control (IMRC) position sensor or monitor circuit on Bank 2. The IMRC system uses butterfly valves in the intake manifold to optimize airflow at low and high RPMs; a position feedback error prevents the PCM from verifying the actual valve position.
01. Most Common Causes
- Faulty or contaminated IMRC position sensor (Bank 2)
- Open, short-to-ground, or short-to-battery in the IMRC circuit wiring or connectors
- Mechanically stuck or broken IMRC actuator/solenoid (Bank 2)
- Vacuum leak in the IMRC actuation hose (if pneumatic system)
- Internal PCM failure (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance, especially at low RPMs
- Possible rough idle or hesitation during acceleration
03. Step-by-Step Diagnosis
Scan for codes and verify P1522 is present; check for related codes
Inspect IMRC position sensor and wiring for damage, corrosion, or loose connections
Test IMRC actuator/solenoid operation and vacuum lines (if applicable)
Check IMRC position sensor signal with a multimeter or oscilloscope
If all else is OK, consider PCM reprogramming or replacement
1. Frequently Asked Questions
Is it safe to drive?▼
You can usually drive short distances, but performance may be reduced and fuel economy could suffer. Have it diagnosed soon to avoid potential drivability issues.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600, depending on the root cause (sensor replacement, wiring repair, or actuator replacement).