Open or short circuit in the wiring to the switchover valve solenoid; Corroded, loose or damaged connector at the valve or at the control module; Failed intake resonance switchover valve solenoid with an open or shorted coil; Blown fuse or loss of power or ground supply to the valve circuit; Cracked or disconnected vacuum hoses or a failed vacuum actuator on the intake manifold (depends on the engine); Internal driver fault in the engine control module.

P1113

Intake Resonance Switchover Valve Circuit.

GM
Powertrain
Manufacturer code
Low severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
1: AreaFuel and air metering
13: FaultThe specific fault in that area

What it means

On GM vehicles P1113 means the engine control module has found a fault in the circuit that operates the intake resonance switchover valve. This valve changes the effective length or volume of the intake path to improve torque across the rev range. The module sets the code when the commanded state of the valve circuit does not match the voltage or current it sees, for example an open circuit, a short to ground or a short to voltage.

Symptoms

Malfunction indicator lamp on
Flat spot or loss of mid-range torque
Reduced power at higher revs
Slightly rough or uneven running at certain engine speeds
Increased intake noise or a change in intake sound
Possible hissing from a vacuum leak if the actuator or hoses are damaged

Possible causes

Open or short circuit in the wiring to the switchover valve solenoidlikely
Corroded, loose or damaged connector at the valve or at the control modulelikely
Failed intake resonance switchover valve solenoid with an open or shorted coillikely
Blown fuse or loss of power or ground supply to the valve circuitpossible
Cracked or disconnected vacuum hoses or a failed vacuum actuator on the intake manifold (depends on the engine)possible
Internal driver fault in the engine control modulerare

How to diagnose

Read and record the stored codes and freeze frame data, then note whether the code is current or history
Check for other codes that point to a shared power supply, ground or vacuum problem
Locate the switchover valve for the specific model and engine, then inspect its wiring, connector and any vacuum hoses for damage, chafing, heat damage or corrosion
Check the relevant fuse and confirm there is a correct power supply and ground at the valve connector using the wiring diagram for that vehicle
Measure the solenoid coil resistance and compare it with the manufacturer specification for that engine
Operate the valve with a bidirectional scan function if supported, and listen for or feel it click and check the actuator moves
Test the wiring between the valve and the control module for continuity and for shorts to ground or voltage
Check the control module driver output only after the wiring and valve have been proven good

How to fix

Repair or replace damaged wiring and clean or renew corroded connector terminals
Replace the intake resonance switchover valve solenoid if its resistance or operation is out of specification
Replace the blown fuse after finding and correcting the cause of the overload
Renew split or loose vacuum hoses or a faulty vacuum actuator on the intake system
Repair or replace the engine control module only if the driver fault is confirmed, and then program it as required
Clear the code after repair and road test to confirm it does not return

Can I keep driving?

Low severity

The car can normally be driven in the short term as the fault mainly affects performance and economy rather than engine safety. Book it in soon to restore full power and to avoid other faults masking behind the warning lamp.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.