Key Takeaway
Excessive Ammonia in Tailpipe Exhaust by Gillig LLC was recalled on July 16, 2021. What to do: 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.
Excessive Ammonia in Tailpipe Exhaust
Description
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.
Injuries / Consequence
Exposure to high levels of ammonia can increase the risk of injury.
Remedy
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.
Products Affected
Vehicle
VehiclesRelated Recalls
Improperly Tightened Rear Axle Upper Torque Rod Fasteners
December 29, 2025
Wheelchair Restraint Retractor May Not Lock
December 17, 2025
Emergency Exit Window Latch May Fail/FMVSS 217
December 16, 2025
High Voltage Batteries May Short Circuit
April 2, 2025
Flat Panel Display Monitor May Detach from Ceiling
February 12, 2025
Damaged Fire Suppression Relay Cable May Fail
December 23, 2024
Frequently Asked Questions
Is this recall still active?
Check the status badge at the top of this page. "Ongoing" means the recall is still active and you should follow the remedy instructions. "Completed" or "Terminated" means the recall process has concluded, though the safety issue remains relevant for any unrepaired products.
How do I check if my product is affected?
Compare the model number, lot code, serial number, or date range listed in the recall notice with the information on your product's label or packaging. For vehicles, check your VIN at NHTSA.gov/Recalls.
What remedy is available for this recall?
The listed remedy for this recall is: 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.
Where can I find the original recall notice?
This recall was issued by NHTSA. You can view the original notice using the link provided above.