Aem/air bypass valve
Defect Summary
Equipment description: air bypass valves part nos. 20-401, 20-402, and 20-403, sold between august 1, 2000, and january 31, 2001, for installation on passenger vehicles to prevent ingestion of water into the engine. the valves are constructed of two plastic pieces sonically welded with a silicon diaphragm and foam spring. the weld seam can crack under high stress loads and the valve's internal diaphragm and spring may be ingested into the throttle body, which in turn, may cause the throttle to stick open.
Safety Consequence
If the throttle is unable to return to the closed position, the driver may lose control of the vehicle possibly resulting in a vehicle crash.
Corrective Action
Aem will notify and provide to its customers a free retaining clip to prevent ingestion of the diaphragm/foam pieces into the throttle body should the valve separate. owner notification began april 26, 2001. owners who do not receive the free clip within a reasonable time should contact aem at 310-484-2322x500.
Similar Recalls
Other recalls from Advanced Engine Management or involving Engine And Engine Cooling.
FAQ: Recall 01E018000
Your rights, the repair process, and what each field on this page means.
What is recall 01E018000?
NHTSA recall 01E018000 was issued by Advanced Engine Management on April 25, 2001. It addresses: Aem/air bypass valve. The recall affects approximately 3,000 vehicles, with the defect involving the Engine And Engine Cooling component.
How do I get this recall repaired?
Contact any authorized Advanced Engine Management dealer and reference NHTSA recall ID 01E018000 or the manufacturer campaign number NR (Not Reported). Under federal law, the repair is completely free regardless of vehicle age or owner history.
Is my vehicle included in this recall?
The only way to confirm is to look up your 17-character VIN at nhtsa.gov/recalls. NHTSA's tool will tell you if VIN-by-VIN this exact recall applies.
How long do I have to get a recall repair done?
There is no expiration on most federal safety recalls. Even if your vehicle is years old and you bought it used, the manufacturer is required to perform the repair at no cost.
Where does the data on this page come from?
All information on this page is sourced directly from the U.S. Department of Transportation public dataset for NHTSA recalls. Last refreshed: 2026-05-22. For the most current official notice, visit nhtsa.gov/recalls.