The worst 2021 Mci D4000 problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
Recalls 1
Fuel system, diesel: fuel injection system: fuel rail
- What is wrong
- Motor Coach Industries (MCI) is recalling certain 2019-2022 D4000 ISTV, D4500, 2021 D4000, D4520, 2020-2021 D4505, D4005, 2020-2022 D45CRTLE, and 2019-2021 J4500 vehicles equipped with certain Cummins X12 diesel engines. The fuel tubes between the fuel rail and the injectors for cylinders four, five, and six may fatigue and crack, which can result in a high pressure fuel leak.
- Risk
- A high pressure fuel leak in the presence of an ignition source can increase the risk of a fire.
- Remedy
- On engines with 75 miles or less, Cummins dealers will install vibration isolators to the fuel tubes. Engines with more than 75 miles will receive new fuel tubes with vibration isolators. Repairs will be performed free of charge. Owner notification letters were mailed March 11, 2022. Owners may contact MCI customer service at 1‑800‑241‑2947. MCI's number for this recall is R21-028.
Recall number 21V971000 · Recall details
Technical service bulletins for the 2021 Mci D4000 8
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- This bulletin is to provide instructions for clearing DTC 1067 FMI 7 (Pressure Sensor Not Calibrated) and...
- This bulletin introduces an optional product improvement to the A/C compressor drive system for coaches...
- This TSIB provides information to provide a software update
- Information to owners showing the proper procedure for checking the oil level in a BITZER HVAC compressor.
- This Technical Service Information Bulletin is a supplemental reminder to all MCI owners/operators of...
- This Technical Service Information Bulletin (TSIB) describes an update from Meritor for the bolt torque...
- Technical Service Information Bulletin describing an update to the Preventaive Maintenance requirements...
- This Service Bulletin provides a checklist of actions to perform on a daily, weekly and monthly basis for...
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Questions about the 2021 Mci D4000
Is the 2021 Mci D4000 reliable?
Owners have filed 0 complaints about the 2021 Mci D4000.
What is the most common problem with the 2021 Mci D4000?
There are not enough complaints to tell.
How many recalls does the 2021 Mci D4000 have?
1 recall, covering fuel system, diesel.
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