Service bulletins for the 2018 Toyota Mirai
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
158 on file from NHTSA, as of 2026-10-19.
About P1DEF on the 2018 Toyota Mirai: what the code means, and the bulletins and recalls about the same components.
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Only bulletins with trouble code: P1DEF are shown. Show all
| TSB004622 | 2022-09-15. Service bulletin. FUEL SYSTEM, GASOLINE; ELECTRICAL SYSTEM. TSB: Some 2016 ? 2019 model year Mirai vehicles may exhibit a warning message, ?FC malfunction, return vehicle to dealer for service.? This message is accompanied by Diagnostic Trouble Code (DTC) P1DEF (450 FC Stack Performance). The Fuel Control Module (FCM) calibration has been revised to address this condition |
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| T-SB-0318-17_Rev | 2019-10-15. Service bulletin. ENGINE; ELECTRICAL SYSTEM. TSB: REVISION NOTICE September 20, 2019 Rev2: ? Applicability has been updated to include 2018 and 2019 model year Mirai vehicles. ? The Production Change Information, Parts Information, and Calibration sections have been updated. September 5, 2018 Rev1: ? The Parts Information section has been updated. Some 2016 ? 2019 model year Mirai vehicles may exhibit a warning message, "FC malfunction, return vehicle to dealer for service." This message is accompanied by Diagnostic Trouble Code (DTC) P1DEF (450 FC Stack Performance). The Fuel Control Module (FCM) calibration has been revised to address this condition. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.