Engine and engine cooling: exhaust system: manifold/header/muffler/tail pipe (Gillig)
Vehicle recall 21V-538. NHTSA received Gillig, LLC’s report on Jul 15, 2021.
Watch and the shortlist are kept with a free account, on every device. Your watch list. NHTSA’s own record is on nhtsa.gov.
The short answer
NHTSA received Gillig, LLC’s report on Jul 15, 2021. Copied from NHTSA on Oct 26, 2026.
Every line below is in NHTSA’s own words, with its source beside it.
What’s wrong with it?
Exposure to high levels of ammonia can increase the risk of injury.
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.
NHTSA, Recalls flat file. Released Oct 26, 2026. Updated daily.
- NHTSA’s part: Engine and engine cooling: exhaust system: manifold/header/muffler/tail pipe.
What should you 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.
NHTSA, Recalls flat file. Released Oct 26, 2026. Updated daily.
- How to reach the firm: Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.
- Check a vehicle by its VIN at NHTSA: the recalls still open on it are listed there.
Which ones are recalled?
NHTSA counts 78 vehicles potentially involved, across everything this recall names.
Each model year opens its own page: every recall naming it, its owner complaints and its crash ratings.
NHTSA, Recalls flat file. Released Oct 26, 2026. Updated daily.
Who is recalling it?
- Made by Gillig, LLC.
NHTSA, Recalls flat file. Released Oct 26, 2026. Updated daily.
What the record doesn’t say
- NHTSA’s recall file doesn’t say whether anyone was hurt. Owners’ complaints are counted on each vehicle’s page.
- Whether one vehicle or seat has been fixed: only its maker, or NHTSA’s lookup with a VIN, can say.
- How many have been returned or fixed isn’t in the notice.
Hearth Record wrote these lines.
Sources
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National Highway Traffic Safety Administration, Recalls flat file (FLAT_RCL_POST_2010).
Released Oct 26, 2026 and checked Oct 26, 2026. Updated daily. Public domain (U.S. Government work).
Vehicle, car seat, tire and vehicle equipment recalls, owner complaints and crash ratings are from the National Highway Traffic Safety Administration (NHTSA). Copied on Oct 26, 2026.