Electrical system: alternator/generator/regulator (MCI)
Vehicle recall 20V-352. NHTSA received Motor Coach Industries’s report on Jun 12, 2020.
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The short answer
NHTSA received Motor Coach Industries’s report on Jun 12, 2020. Copied from NHTSA on Oct 23, 2026.
Every line below is in NHTSA’s own words, with its source beside it.
What’s wrong with it?
If the engine shuts down or loses power while the vehicle is in motion, this may increase the risk of a crash.
Motor Coach Industries (MCI) is recalling certain 2018-2020 D4000, D4005, D4500, D4505 and D45CRTLE buses manufactured with electric cooling fans (E-fan) for the radiator and charge air cooler, Borg Warner 55SI model dual alternator configuration (with a sense stud and wire), and Parker Vansco Multiplexing Module (VMM) Multiplex system.
A build-up of debris, corrosion, and/or water flow could cause a high resistance path to ground for the sense stud on the back of the alternator and cause the alternator to produce excessive voltage output, which may exceed the threshold limit currently programmed in the VMM and result in a loss of engine power and vehicle shutdown.
NHTSA, Recalls flat file. Released Oct 23, 2026. Updated daily.
- NHTSA’s part: Electrical system: alternator/generator/regulator.
What should you do?
MCI will notify the affected owners, and dealers will install a new application code in the Parker VMM multiplex modules increasing the overvoltage threshold limit, free of charge. The recall began July 23, 2020. Owners may contact MCI customer service at 1-800-241-2947. MCI’s number for this recall is SB 479.
NHTSA, Recalls flat file. Released Oct 23, 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.safercar.gov.
- Check a vehicle by its VIN at NHTSA: the recalls still open on it are listed there.
Which ones are recalled?
NHTSA counts 1,067 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 23, 2026. Updated daily.
Who is recalling it?
- Made by Motor Coach Industries.
NHTSA, Recalls flat file. Released Oct 23, 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 23, 2026 and checked Oct 23, 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 23, 2026.