The APDTY 17113598 Idle Air Control (IAC) Valve is a direct-replacement fuel injection component designed to restore proper idle control on select 1999-2004 GM vehicles. This throttle body-mounted valve regulates engine idle speed by controlling airflow during closed-throttle conditions, addressing common symptoms like rough idle, stalling at stops, and erratic RPM fluctuations caused by a damaged or failed original IAC valve.
Key Takeaways
- Direct replacement for OE part number 17113598 on select GM vehicles
- Fixes rough idle, stalling, high/low idle speed, and check engine light codes related to IAC malfunction
- Compatible with select 1999-2002 Chevrolet, 1999-2002 GMC, 2002 Cadillac, and 2000-2004 Pontiac models
- Brand new unit designed for straightforward throttle body installation
- Verify exact fitment using the compatibility chart before purchase
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What Does the Idle Air Control Valve Do?
The Idle Air Control (IAC) valve is a small electric motor-controlled valve mounted on or near the throttle body. Its job is to regulate the amount of air that bypasses the throttle plate when your foot is off the accelerator. The engine control module (ECM) continuously adjusts the IAC valve position to maintain a stable idle speed as engine loads change—such as when the air conditioning compressor cycles on, the transmission shifts into gear, or electrical accessories draw power.
When the IAC valve fails or becomes clogged with carbon deposits, the ECM loses precise control over idle air, resulting in unstable engine speed and drivability issues. The APDTY 17113598 restores this critical function by replacing the worn or faulty valve assembly.
What Are the Symptoms of a Failed IAC Valve?
A malfunctioning idle air control valve typically produces noticeable drivability problems:
- Rough or erratic idle: Engine RPM fluctuates or "hunts" while stopped at traffic lights
- Stalling: Engine dies when coming to a stop or when shifting into gear
- High idle speed: Engine idles significantly higher than normal (often above 1,200 RPM)
- Low idle speed: Engine idles too low and may feel like it's about to stall
- Check engine light: Diagnostic trouble codes such as P0505 (idle control system malfunction), P0506 (idle speed lower than expected), or P0507 (idle speed higher than expected)
- Hard starting: Engine requires extended cranking or stalls immediately after starting
These symptoms often worsen when engine loads change—such as turning on headlights, AC, or placing the transmission in drive. If you're experiencing any combination of these issues, the IAC valve is a common and cost-effective repair point.
Which Vehicles Does the APDTY 17113598 Fit?
The APDTY 17113598 IAC valve is engineered for specific General Motors vehicles spanning model years 1999 through 2004. According to verified fitment data, this part is compatible with:
- Cadillac: Select 2002 models
- Chevrolet: Select 1999-2002 models
- GMC: Select 1999-2002 models
- Pontiac: Select 2000-2004 models
Important: Fitment varies by specific vehicle year, make, model, engine size, and production date. Not all vehicles within these ranges use this particular IAC valve design. Always verify your exact vehicle against the compatibility chart on the product page before ordering. Incorrect IAC valves will not fit or function properly, even on vehicles within the listed year ranges.
APDTY 17113598 IAC Valve Specifications
| Specification | Detail |
|---|---|
| APDTY Part Number | 17113598 (also marketed as 217-1806) |
| Replaces OE Number | 17113598 |
| Component Type | Idle Air Control (IAC) Valve |
| Condition | Brand New |
| Fitment Type | Direct Replacement |
| Mounting Location | Throttle Body |
| Compatible Vehicle Makes | Cadillac, Chevrolet, GMC, Pontiac (select models) |
| Compatible Model Years | 1999-2004 (varies by make/model) |
| Function | Controls engine idle air bypass for stable idle speed |
How Do You Install an Idle Air Control Valve?
Replacing an IAC valve is generally a straightforward repair suitable for DIY mechanics with basic hand tools. While specific procedures vary by vehicle, the general process includes:
- Disconnect the battery: Remove the negative terminal to prevent electrical shorts
- Locate the IAC valve: Find the valve mounted on the throttle body (usually secured by two or three bolts)
- Disconnect the electrical connector: Depress the tab and unplug the wiring harness from the valve
- Remove mounting bolts: Use the appropriate socket or wrench to remove the fasteners holding the valve in place
- Remove the old valve: Carefully pull the IAC valve away from the throttle body; note the condition of the gasket or O-ring
- Clean the mounting surface: Remove carbon deposits and old gasket material from the throttle body mating surface
- Install the new valve: Position the APDTY 17113598 with a new gasket (if required) and secure with mounting bolts to factory torque specifications
- Reconnect the electrical connector: Plug in the wiring harness until it clicks
- Reconnect the battery: Reattach the negative terminal
- Clear codes and test: Use a scan tool to clear stored trouble codes, then start the engine and verify stable idle operation
Note: Some vehicles may require an idle relearn procedure after IAC replacement. Consult your vehicle's service manual for model-specific instructions. In many cases, simply driving the vehicle through varied conditions will allow the ECM to relearn proper idle parameters automatically.
Frequently asked questions
Can I clean my old IAC valve instead of replacing it?
While cleaning carbon buildup from an IAC valve with throttle body cleaner can sometimes restore function temporarily, a valve with worn internal components, damaged pintle, or electrical faults requires replacement. If cleaning doesn't resolve idle issues or check engine codes return, replacement with the APDTY 17113598 is the reliable long-term solution.
Will this IAC valve work on my vehicle if the year range matches?
Not necessarily. GM used multiple IAC valve designs across different engines and production dates within the same model year. You must verify your specific vehicle year, make, model, and engine against the compatibility chart on the product page to ensure correct fitment.
Do I need to program or calibrate the new IAC valve?
The APDTY 17113598 does not require programming. However, after installation, the engine control module may need to relearn idle parameters. This typically happens automatically during normal driving, though some vehicles benefit from performing a specific idle relearn procedure outlined in the service manual.
What is the difference between part numbers 17113598 and 217-1806?
These are the same physical component marketed under different numbering conventions. APDTY 17113598 and 217-1806 both refer to this idle air control valve and are fully interchangeable.
A failing idle air control valve doesn't just create frustrating drivability problems—it can also lead to stalling in traffic and failed emissions tests. The APDTY 17113598 IAC valve provides a direct-replacement solution that restores proper idle control on select 1999-2004 GM vehicles. With brand-new construction and straightforward installation, this component helps you eliminate rough idle, stalling, and erratic RPM issues without the dealership price tag. Verify your vehicle's compatibility using the chart on the product page, and restore smooth, stable idle performance today.
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