Jeep Grand Wagoneer 2019–2022 — technical service bulletin
Bulletin 9004484 · NHTSA communication 10214520 · issued May 4, 2022
Technical service bulletin
communication type
Engine and Engine Cooling
component
2019–2022
model years
5
vehicle entries
Official summary
Motor Generator Unit Engineering is looking to avoid unnecessary part replacements for Motor Generator Unit (MGU) underhood whining noise and P1C64 faults. When replacing the MGU for a bearing noise, connect the scan tool to the vehicle and create a scan report to include with the claim prior to replacement of the MGU. See SOL case S2208000009 for added details. Please check Service Library for available TSBs for your concern. Follow current Service Procedures for each complaint, but call Engineering before removing MGU to gather further information. Contacts: FCA Redacted Content If no respon
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.