Overvoltage alternator may cause engine shutdown
Defect Summary
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.
Safety Consequence
If the engine shuts down or loses power while the vehicle is in motion, this may increase the risk of a crash.
Corrective Action
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.
Similar Recalls
Other recalls from Motor Coach Industries, Inc or involving Electrical System.
FAQ: Recall 20V352000
Your rights, the repair process, and what each field on this page means.
What is recall 20V352000?
NHTSA recall 20V352000 was issued by Motor Coach Industries, Inc on June 12, 2020. It addresses: Overvoltage alternator may cause engine shutdown. The recall affects approximately 1,067 vehicles, with the defect involving the Electrical System component.
How do I get this recall repaired?
Contact any authorized Motor Coach Industries, Inc dealer and reference NHTSA recall ID 20V352000 or the manufacturer campaign number SB 479. 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.