2021 Mci J4500 technical service bulletins

Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.

• Aug 28, 2026 Service bulletinITS to replace the neck fill assembly with a new design which resolves a possible splashback issue at...
• Aug 11, 2026 Service bulletinThis bulletin is to provide instructions for clearing DTC 1067 FMI 7 (Pressure Sensor Not Calibrated) and...
• Jun 11, 2026 Service bulletinThis bulletin introduces an optional product improvement to the A/C compressor drive system for coaches...
• May 6, 2026 Service bulletinThis TSIB provides information to provide a software update
• Mar 20, 2026 Service bulletinInstructions to remove DEF sensor bypass calibration from engine ECM and new sensor installation AR
• Feb 9, 2026 Service bulletinThis TSIB is to inform customers the recommended steering axle cleaning/greasing instructions to prevent...
• Oct 1, 2025 Service bulletinInstructions to download BCC program (T35-1581) V4.06. This program will allow the Eco-Temp system to...
• Jun 10, 2025 Service bulletinThe mini fuses in the battery compartment for the condenser may not be enough for certain load conditions.
• Nov 5, 2024 Service bulletinInformation to owners showing the proper procedure for checking the oil level in a BITZER HVAC compressor.
• Jul 18, 2023 Service bulletinInstructions to improve sealing in the front junction box.
• Sep 7, 2022 Service bulletinMCI has released Technical Service Information Bulletin (TSIB) 22-12 to address concerns with water...
• May 3, 2022 Service bulletinTechnical Service Information Bulletin describing the retrofit for the front junction box cover on...
• Apr 1, 2022 Service bulletinThis Technical Service Information Bulletin is a supplemental reminder to all MCI owners/operators of...
• Jan 5, 2022 Service bulletinThis Technical Service Information Bulletin describes interim inspection procedures required every 6000...
• Oct 6, 2021 Service bulletinTechnical Service Information Bulletin describing an update to the Preventaive Maintenance requirements...
• Jun 2, 2021 Service bulletinThis Technical Sevice Information Bulletion is to advise of a part number supersession of the coolant hump...
• Oct 22, 2020 Service bulletinThis service bulletin outlines the steps to add the secondary air filter
• Sep 17, 2020 Service bulletinThis Service Bulletin informs affected owners that the A/C compressor on certain J4500 coaches are making...