NHTSA Recall 20V352000: Alternator/generator/regulator (electrical system)
Motor Coach Industries reported this safety recall to NHTSA on , covering an estimated 1,067 vehicles. It affects 6 models including the Mci D4000.
| NHTSA campaign | 20V352000 |
|---|---|
| Manufacturer campaign | SB 479 |
| Component | ELECTRICAL SYSTEM › ALTERNATOR/GENERATOR/REGULATOR |
| Report received | June 12, 2020 |
| Owner notification | July 23, 2020 |
| Initiated by | Manufacturer |
Defect
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 risk
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.
Notes
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.
Vehicles covered by recall 20V352000
| Make and model | Model years |
|---|---|
| Mci D4000 | 2018, 2019, 2020 |
| Mci D4005 | 2018, 2019, 2020 |
| Mci D45 Crt LE | 2018, 2019, 2020 |
| Mci D4500 | 2018, 2019, 2020 |
| Mci D4505 | 2018, 2019, 2020 |
| Mci J4500 | 2018, 2019, 2020 |
Being listed here means the campaign covers the model year, not that every car was built with the defect or is still unrepaired. Enter your VIN above to check your specific vehicle. Recall repairs are free at authorised dealers. Source: NHTSA, October 2026.