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Service bulletin 99021

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id610295
Published by NHTSA2000-04-25
Manufacturer's number99021
Manufacturer's date1999-07-06
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)

NHTSA's summary

SOME VEHICLES MAY EXHIBIT A MALFUNCTION INDICATOR LIGHT ON, AND ONE OR MORE ENGINE MISFIRE DIAGNOSTIC TROUBLE CODES ARE STORED. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Transmission and driveline, Automatic transmission, Transmission control module

Vehicles listed
HONDA PASSPORT1996, 1997

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
110120032004-09-21. Service bulletin. IDENTIFYING AUTOMATIC TRANSMISSION SHIFT SOLENOIDS. HONDA. SERVICENEWS. *TT
1001022004-03-19. Service bulletin. HARSH 2ND TO 3RD UPSHIFT. HONDA SERVICENEWS. *TT
10032004-01-21. Service bulletin. DESCRIPTIONS FOR THE AUTOMATIC TRANSMISSION SHIFT SOLENOIDS. *TT
12022003-09-06. Service bulletin. STRAINING THE AUTOMATIC TRANSMISSION FLUID (ATF) TO DIAGNOSE AUTOMATIC TRANSMISSIONS. *TT
0101032003-07-18. Service bulletin. CHECK (ATF) AUTOMATIC TRANSMISSION FLUID CONDITION TO DIAGNOSE (A/T) AUTOMATIC TRANSMISSIONS. *TT *JB