Service bulletins for the 2021 Mack MD
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.
112 on file from NHTSA, as of 2026-10-19.
About P0204 on the 2021 Mack MD: what the code means, and the bulletins and recalls about the same components.
By type
By component
By trouble code
Only bulletins with trouble code: P0204 are shown. Show all
| KC-714 | 2022-06-07. Service bulletin. ENGINE AND ENGINE COOLING. Mack Chassis - Diagnostic Trouble Codes ( DTC's ) - P020113, P020213, P020313, P020413, P020513, P020613, Cylinders 1 Through 6 Injector A Open Circuit |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.