Intake Resonance Switchover Valve Control Circuit (GM)
What does P1113 mean?
The P1113 code means the vehicle's onboard diagnostic system has detected: Intake Resonance Switchover Valve Control Circuit (GM). This is a low severity code.
Common Symptoms
- Check Engine Light on
- Slight loss of power at certain RPM ranges
- Minor decrease in fuel efficiency
- Engine may feel flat during mid-range acceleration
- No noticeable symptoms in some cases
Probable Causes (Ranked by Likelihood)
- Failed intake resonance switchover solenoid Very High
- Open or short in solenoid control wiring High
- Corroded electrical connector at solenoid Moderate
- Stuck or jammed intake resonance valve Moderate
- PCM driver circuit failure Low
Step-by-Step Diagnostic Procedure
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Use a scan tool to command the intake resonance solenoid on and off
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Listen for the solenoid clicking when activated
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Measure resistance of the solenoid coil (compare to specifications)
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Inspect the solenoid connector for corrosion or damage
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Check for vacuum leaks at the resonance valve and associated hoses
Frequently Asked Questions
What is the intake resonance switchover valve?
The intake resonance switchover valve changes the effective length of the intake manifold runners to optimize airflow at different engine speeds. This improves both low-end torque and high-end horsepower.
Is P1113 urgent?
No, P1113 is a low-severity code. The vehicle will run fine for normal driving. You may only notice a slight reduction in performance during spirited acceleration.
Can I ignore P1113?
While you can drive safely with this code, it will keep your Check Engine Light on, which could mask other more serious codes. It is best to repair it when convenient.