Excessive ammonia in tailpipe exhaust
Defect Summary
Gillig, llc (gillig) is recalling certain 2020-2021 low floor vehicles equipped with cummins l9 diesel engines. the engine calibration software's management of the injection of diesel exhaust fluid can allow excessive ammonia into the tailpipe exhaust.
Safety Consequence
Exposure to high levels of ammonia can increase the risk of injury.
Corrective Action
Cummins will recalibrate the engine, free of charge. owners may contact gillig's customer service at 1-510-264-5073 or 1-800-735-1500.
Similar Recalls
Other recalls from Gillig, Llc or involving Engine And Engine Cooling.
FAQ: Recall 21V538000
Your rights, the repair process, and what each field on this page means.
What is recall 21V538000?
NHTSA recall 21V538000 was issued by Gillig, Llc on July 15, 2021. It addresses: Excessive ammonia in tailpipe exhaust. The recall affects approximately 78 vehicles, with the defect involving the Engine And Engine Cooling component.
How do I get this recall repaired?
Contact any authorized Gillig, Llc dealer and reference NHTSA recall ID 21V538000 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.