P1527 IMRC Solenoid #2 Circuit Fault
The P1527 code indicates that the Powertrain Control Module (PCM) has detected an electrical fault in the control circuit for the Intake Manifold Runner Control (IMRC) solenoid #2. This solenoid adjusts the intake manifold geometry to optimize low-end torque and high-end power. The fault is triggered when the PCM detects an open circuit, short to ground, or short to battery voltage in the solenoid control wiring for bank 2.
01. Most Common Causes
- Faulty IMRC solenoid #2 (open or shorted coil)
- Open or shorted wiring in the solenoid control circuit
- Damaged, corroded, or loose connector terminals at the solenoid
- Internal PCM driver failure (power transistor)
- Mechanical binding of the intake runner flaps (rare, usually sets a position code)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance, especially at low or high RPM
- Possible rough idle or hesitation during acceleration
03. Step-by-Step Diagnosis
Scan for codes and verify P1527 is present; check for related codes.
Inspect the IMRC solenoid #2 connector and wiring for damage, corrosion, or loose terminals.
Test the solenoid resistance with a multimeter; compare to manufacturer specs (typically 20-40 ohms).
Check for power and ground at the solenoid connector with the key on; if missing, trace wiring for opens/shorts.
If wiring and solenoid test OK, suspect a PCM driver failure; perform a bi-directional test with a scan tool if available.
1. Frequently Asked Questions
Is it safe to drive?▼
Yes, but you may notice reduced performance and fuel economy. It's best to diagnose and repair soon to avoid further issues.
How much does it cost to fix?▼
Typically $150-$400, depending on whether the solenoid ($50-$150) or PCM ($300-$800) needs replacement, plus labor.