Service bulletins for the 1999 Dodge Ram
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.
142 on file from NHTSA, as of 2026-10-19.
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Only bulletins with component: Exhaust and emissions are shown. Show all
| 1100605 | 2006-01-27. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. ILLUMINATED MIL AS THE RESULT OF A DIAGNOSTIC TROUBLE CODE (DTC) P0420 - CATALYST EFFICIENCY, OR MAY HAVE FAILED A CALIFORNIA SMOG OR STATE I/M TEST BUT WITHOUT AN ILLUMINATED MIL, OR A RATTLING SOUND FROM THE UNDERSIDE OF THE VEHICLE. CATALYTIC CONVERTER EXTENDED WARRANTY TO REPLACE THE CATALYTIC CONVERTER. *TT |
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| 2500401 | 2001-07-11. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. SUBJECT REGARDING ADDITIONAL DIAGNOSTIC FOR DIAGNOSTIC TROUBLE CODES CAUSED BY AN EVAPORATIVE SYSTEM LEAK. *TT |
| 976 | 2001-06-04. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. ON SOME VEHICLES THE ON-BOARD DIAGNOSTIC (OBD) SYSTEM MAY NOT DETECT A CATALYST FAILURE AS REQUIRED BY CALIFORNIA EMISSIONS REGULATION. AS A RESULT, THE OBD SYSTEM MAY NOT ILLUMINATE THE CHECK ENGINE LIGHT IF A CATALYST FAILS. *TT |
| 250298 | 1999-01-20. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. SUBJECT REGARDING I/M ( INSPECTION MAINTENANCE ) TESTING - OBD II "CARB" READINESS MONITOR INFORMATION. *YC |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.