Code Definition

P1113 — Intake Resonance Switchover Valve Control

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: GM

About P1113

P1113 is a manufacturer-specific powertrain diagnostic trouble code recorded for GM vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1113 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The intake resonance switchover valve is part of a variable intake manifold system that the Powertrain Control Module (PCM) opens and closes to change the effective intake runner length or open a resonance chamber, broadening the torque curve across the engine speed range. The valve is typically operated by a vacuum actuator controlled by a PCM driven solenoid, and on many systems a position switch or sensor confirms the valve state. DTC P1113 sets when the PCM detects a fault in the control of this valve, such as the control circuit being open or shorted, or the valve not reaching its command...

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