P1113 Buick Code - Intake Resonance Switchover Solenoid Control Circuit
Quick Answer
Multi-Ram system uses variable air induction tuning to achieve maximum performance and efficiency over the entire operating range of the engine. Common causes include Faulty Switchover Valve, Switchover Valve harness is open or shorted, Switchover Valve circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1113 Buick indicates Intake Resonance Switchover Solenoid Control Circuit.
- Common causes
- Common causes include Faulty Switchover Valve, Switchover Valve harness is open or shorted, Switchover Valve circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1113 Buick Description
The intake resonance Switchover Valve is located in the air intake duct assembly in front of the engine. This vacuum-operated valve is also a moveable divider that changes the tuning of the air intake system. Vacuum to the valve is controlled by ECM controlled solenoid valve. By opening and closing these valves independently in different combinations, 4 different airflow configurations can be created, each optimized to a particular set of engine operating conditions.
Both solenoid valves are supplied power via the main relay (switched battery feed circuit). Both solenoid valves have a control circuit to ECM. ECM controls a valve by grounding the control circuit via an internal driver. The primary function of the driver is to supply ground for components being controlled. Each driver has a fault line which is monitored by ECM. When ECM is commanding a component on, control circuit voltage should be low (near zero volts). When ECM is commanding the control circuit to a component off, circuit voltage should be high (near battery voltage). If the fault detection circuit senses a voltage other than what is expected, this Diagnostic Trouble Code (DTC) will set.
ECM will monitor the circuit for short to ground, short to voltage, open or an internally shorted or excessively low resistance in the circuit. When ECM detects any of these malfunctions, this DTC will set, and the affected driver will be disabled. ECM will continue to test the circuit and if the fault disappears, the driver will be reactivated.
What are the Possible Causes of the DTC P1113 Buick?
- Faulty Switchover Valve
- Switchover Valve harness is open or shorted
- Switchover Valve circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P1113 Buick?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1113 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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