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NHTSA Campaign 20V352000

ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR

Issued by Motor Coach Industries · Reported Jun 12, 2020 · 1,067 vehicles affected

What's wrong

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.

Consequence

If the engine shuts down or loses power while the vehicle is in motion, this may increase the risk of a crash.

Remedy

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.

Vehicles affected by this recall

Make Model Year Units
MCI D4000 2018 1,067
MCI D4000 2019 1,067
MCI D4000 2020 1,067
MCI D4005 2018 1,067
MCI D4005 2019 1,067
MCI D4005 2020 1,067
MCI D45 CRT LE 2018 1,067
MCI D45 CRT LE 2019 1,067
MCI D45 CRT LE 2020 1,067
MCI D4500 2018 1,067
MCI D4500 2019 1,067
MCI D4500 2020 1,067
MCI D4505 2018 1,067
MCI D4505 2019 1,067
MCI D4505 2020 1,067
MCI J4500 2018 1,067
MCI J4500 2019 1,067
MCI J4500 2020 1,067

Source: NHTSA Campaign 20V352000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.