1998 Pontiac Bonneville Engine And Engine Cooling:engine Problems
NHTSA component category: ENGINE AND ENGINE COOLING:ENGINE · data through 07/12/2026
Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
How engine and engine cooling:engine ranks on this vehicle
Share of the 277 complaints citing each category; one complaint can cite several. Full breakdown on the 1998 Pontiac Bonneville overview page.
What owners report
“1998 PONTIAC BONNIVILLE THEY USE A PLASTIC INTAKE MANIFOLD COVER OF SCHROWED.WITHIN THIS COVER THEY HAVE HOLE FOR THE EGR VALVE WHICH GETS VERY VERY…”NHTSA complaint 10000541 — filed 01/06/2003
“CONSUMER STATES THAT WHILE DRIVING AT ANY SPEED AND NO WARNING COOLANT FLUID ARE BEING PUMP INTO THE ENGINE. DEALER NOTIFIED TS”NHTSA complaint 8021553 — filed 10/24/2002
“WHILE DRIVING VEHICLE STARTED RUNNING ROUGH. THEN, THE ENGINE STOPPED. CONTACTED DEALER, VALVE COVER GASKET WAS LEAKING, AND WATER WENT INTO ENGINE CYCLINDER. THIS IS…”NHTSA complaint 8015482 — filed 08/05/2002
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Engine And Engine Cooling:engine complaints by year filed
Frequently asked questions
Does the 1998 Pontiac Bonneville have engine and engine cooling:engine problems?
Engine And Engine Cooling:engine is the #4 most-reported problem area on the 1998 Pontiac Bonneville: 34 of 277 complaints on file (12.3%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 1998 Pontiac Bonneville have in total?
277 complaints were on file with NHTSA as of 07/12/2026. Across all categories, 9 involved a crash, 28 involved a fire, 7 reported injuries, and none reported deaths.
What does NHTSA's engine and engine cooling:engine category include?
NHTSA assigns each complaint to standard component categories; this page reports the ENGINE AND ENGINE COOLING:ENGINE category exactly as NHTSA defines and records it.
