Problems · by component

1996 Pontiac Bonneville engine and engine cooling problems

43 owner complaints to NHTSA about the 1996 Pontiac Bonneville cite engine and engine cooling, 29% of all 150 complaints for this model year.

Complaints
43
29% of all complaints
Crashes
0
Reported by owners
Fires
5
Reported by owners
Injuries
0
Reported by owners
01 —Owner reports

What owners say about the engine and engine cooling

Verbatim from NHTSA complaints, newest first
“TL* THE CONTACT OWNS A 1996 PONTIAC BONNEVILLE. THE CONTACT STATED THAT SEVERAL ATTEMPTS HAD TO BE MADE BEFORE SUCCEEDING IN STARTING VEHICLE. THE VEHICLE WAS TAKEN TO A MECHANIC WHERE THE FAILURE WAS LOCATED AT THE INTAKE MANIFOLD AND OXYGEN SENSOR. THE INTAKE MANIFOLD CAP WAS MELTING AND CAUSING OIL TO SPILL. IN ADDITION, THE FAILURE WAS PRODUCING WHITE SMOKE FROM THE TAILPIPE EXHAUST. THE VEHICLE WAS REPAIRED BUT THE CONTACT WAS UNSURE AS TO THE EXACT REPAIRS MADE TO THE VEHICLE. THE CONTACT ALSO STATED THAT THE ANTI-THEFT SYSTEM FAILED AND WOULD ALERT THE CONTACT THAT THE DOORS WERE OPENED, AND THE SEAT BELTS WERE NOT SECURED ERRONEOUSLY. THE FUEL INJECTION SYSTEM WAS ALSO DEFECTIVE AND WAS REPAIRED BY REPLACING THE FUEL INJECTOR, AND ADDING FUEL CLEANER. THE CONTACT REFERENCED NHTSA CAMPAIGN ID NUMBERS: 96V116000 (FUEL SYSTEM, GASOLINE: FUEL INJECTION SYSTEM) AND 95V204000 (ELECTRICAL SYSTEM: IGNITION: ANTI-THEFT CONTROLLER) HOWEVER, THE CONTACT WAS ADVISED THAT THE VEHICLE WAS NOT INCLUDED IN EITHER RECALL CAMPAIGN. THE CURRENT MILEAGE WAS 158,000. THE APPROXIMATE FAILURE MILEAGE WAS 140,000.”
Owner complaint to NHTSAFiled Jun 28, 2012Engine and engine cooling, Electrical system, Fuel/propulsion systemFire reportedODI 10463433
“THIS CAR BELONGS TO MY ELDERLY MOTHER WHICH SHE BOUGHT USED AND HAS BEEN AN ON GOING PROBLEM! OCCASIONALLY WHEN STARTING THE CAR, THE ENGINE WILL BACKFIRE, AFTER STARTING IT WOULD RUN OK. THE CAR NOW DOES NOT RUN AS THE INTAKE MANIFOLD IS BROKEN FROM THE BACKFIRING AND ALMOST CAUGHT ON FIRE THE LAST TIME IT WAS ATTEMPTED TO START THE MOTOR! ACCORDING TO PONTIAC THERE IS NO RECALL ON THIS CAR BY THE VIN NUMBER!! *JS”
Owner complaint to NHTSAFiled May 15, 2012Engine and engine cooling, Electrical system, Fuel/propulsion systemODI 10458548
“1996 PONTIAC BONNEVILLE PLASTIC MANIFOLD IN ENGINE FROM MANUFACTURE BROKE CAUSING DEX COOLANT TO LEAK INTO ENGINE DESTROYING SEALS/HEAD GASKETS. REPLACE AT DEALER GASKET,GASKET KIT,VALVE,VALVE KIT,UPPER MANIFOLD, LOWER MANIFOLD RESEAL,COOLANT. DEALER DOES NOT HONOR RECALL. *TR”
Owner complaint to NHTSAFiled Mar 9, 2010Engine and engine coolingODI 10318090
“AROUND JAN 2008 WHILE DRIVING A PLASTIC WATER HOSE BURST. I REPLACED IT AND HAD NO OTHER PROBLEM UNTIL AROUND AUG 2008. THIS TIME THE WATER PUMP STARTED LEAKING. I REPLACED THAT AND THE THERMOSTAT AND RADIATOR CAP, BUT I STILL KEPT LOOSING COOLANT. THEN I FOUND A CRACK IN THE RADIATOR WHICH I REPLACE AROUND THE END OF AUG 2008. I STILL KEPT HAVING TO TOP OFF THE COOLANT RESERVOIR EVER TWO DAYS. ABOUT JUNE 2008 I STARTED HAVING TROUBLE WITH THE VEH STARTING, IT WOULD SEEM LIKE IT WASN'T GETTING ENOUGH GAS OR FLOODING. IT WOULD BE RUNNING BUT BARLEY AND IT WOULD NOT ACCELERATE WHEN YOU PRESS THE GAS PEDAL. FINALLY IT WOULD START. IT DOESN'T DO IT ALL THE TIME BUT IT'S DOING IT MORE OFTEN NOW. I'VE FUEL SYSTEM AND INJECTION CLEANERS WITH NO CHANGE. THEN I WENT TO NHTSA AND FOUND A RECALL 96V-116 THAT SEEMS TO BE THE CAUSE OF MY PROBLEM. I WENT TO THE LOCAL PONTIAC DEALERS AND THEY SAID THAT MY VIN WAS NOT PART OF THE RECALL AND THAT THERE WAS NOTHING THEY DO. I TOLD THEM THAT I WOULD BRING BACK TO GET A DIAGNOSTIC TEST. *TR”
Owner complaint to NHTSAFiled Oct 8, 2008Engine and engine cooling, Fuel system, gasolineODI 10244906
“TL*THE CONTACT OWNS A 1996 PONTIAC BONNEVILLE. WHILE DRIVING BETWEEN 35-40 MPH, THE VEHICLE GRADUALLY LOST POWER AND SHUT OFF. WHEN THE CONTACT ATTEMPTED TO RESTART THE VEHICLE, IT BACKFIRED. THE VEHICLE WAS PUSHED TO THE SIDE OF THE ROAD AND TOWED TO THE DEALER. THE DEALER STATED THAT THE UPPER INTAKE MANIFOLD WAS CRACKED AND WOULD COST $503 TO REPAIR. THE CURRENT MILEAGE WAS 176,000 AND FAILURE MILEAGE WAS 105,000. UPDATED 04/08/08. *LJ THE BATTERY WAS REPLACED DUE TO THE VEHICLE NOT STARTING.”
Owner complaint to NHTSAFiled Mar 5, 2008Engine and engine cooling, Electrical systemODI 10220126
“TL*THE CONTACT OWNS A 1996 PONTIAC BONNEVILLE. THE VEHICLE BACKFIRED WHEN THE IGNITION WAS STARTED, AND THE CHECK ENGINE INDICATOR LIGHT ILLUMINATED. THE INTAKE MANIFOLD WAS DAMAGED. THIS FAILURE OCCURRED TWICE BEFORE AND THE MANIFOLD WAS REPLACED. A LOCAL MECHANIC STATED THAT THIS VEHICLE WAS INCLUDED IN RECALL # 96V116000. HOWEVER, THE MANUFACTURER STATED THAT THE VEHICLE WAS EXCLUDED FROM THE RECALL. THE CONTACT POSSESSED THE REPAIR INVOICES. THE CURRENT AND FAILURE MILEAGES WERE 150,000. *AK”
Owner complaint to NHTSAFiled Apr 13, 2007Engine and engine coolingODI 10187745

Showing 6 of 43 reports. Read every report on NHTSA.gov.

Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026NHTSA vehicle page

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.

Other 1996 Bonneville problem areas