Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 1996 Pontiac Bonneville owners, lightly cleaned up (personal details are redacted by NHTSA).
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. …
Tl* the contact owns a 1996 Pontiac Bonneville. The contact stated that while parked, the anti-theft and an unknown security warning lights illuminated and the vehicle required multiple attempts to start. The vehicle was taken to an independent mechanic where the ignition lock cylinder was replaced and a new key made but the failure recurred. The contact mentioned that the horn and chime sounded uncontrollably. In addition, the radio failed to function. The interior lighting controls and the power door locking features failed intermittently. The vehicle was not repaired. The VIN was not included in the NHTSA campaign number: 95V204000 (electrical system). The manufacturer was not notified of the failure. The approximate failure mileage was 125,000.
Car was at aproximately 87000. Turned the car on, there was a loud explosion and smoke came out from under the hood, didnt see any flames, popped open the hood, and smoke just continued to pile out. Engine light came on, and the mechanic found the engine was on its last breath. Had engine relaced for a used engine with 4500 miles on it for $1500. Soon after the engine the alternator started to die, where just by standing next to the car you can hear metal to metal grinding noise coming from it. Paid $100 to get new alternator. Right after alternator the eg r valve died, had it replaced, another $300 spent. Now come spedometer saying 99000 but the second engine only having 60000 the serpentine belt cracked and worn out beyong believe. Another $75 spend. …
Tl* the contact owns a 1996 Pontiac Bonneville. While driving at speeds of at least 10 MPH or while sitting idle, the vehicle would stall without warning. The power windows, seats and fuel pump would become inoperable as well. The contact would recharge the battery and once fully charged, the vehicle would operate normally for a short period of time before stalling again. The vehicle was taken to an independent mechanic but they could not duplicate the failure. The failure persisted. The contact also stated that it would take several attempts to remove the key from the ignition when shutting off the engine. The vehicle was taken to a different mechanic where they could not duplicate the additional failures. The mechanic suggested that the ignition anti-theft controller was faulty and caused the vehicle to stall. …
My 1996 Bonneville started acting up, roughly idling, and hesitating when taking off. There was loss of power, poor gas mileage, car would shut it self off while driving down the highway.check engine light came on and started flashing. Took it to auto zone to get it checked. Scanner idicated that it had multiple misfires, and that my map sensor was bad. Replaced map sensor. Still didnt change on how the vehicle operated. Replaced one of coil packs, still nothing. Put new plug wires and nothing cahned. New oxygen sensor installed, and still nothing. Changes. Over all I just got done spending $150.00 on this car and I cant even afford that, and still have not resolved the problem. I replaced basically everything that the computer came up with. What can I do here to solve this problem without me hurting my financial status, and me blowing the car up.
Electrical system problem. Windows quit working, directly related to engine not firing up. Also affects door chimes, security, seat controls, interior lighting. Multiple attempts of trying to fix problem, battery cables, battery, replacing ignition wires to no avail. Problem continues to worsen. Had to have towed to dealer, since local mechanics could not find initial problems. Car does not run at this time. I even put on a fuel pump(which didn't need replacing) due to shut off of motor. When windows quit working it also affects the fuel and spark. We think its in the computer and/or security system.
While driving at aprx 40mph the car lost all power, and the steering wheel locked up. This happened twice within 3 weeks. The brakes still worked ,and it was a straight road so was able to stop the car without causing any accidents or injury. Stearing wheel and pedals shake between 65 and 75mph. Mechanic found that smaller bracket of the drive wheel has become loose. Replaced the bracket. Worked fine for about 2 weeks...then shaking started to come back...will be taking it to the mechanic again..
Tl 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. The battery was replaced due to the vehicle not starting.
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!!
96 Pontiac Bonneville.while parked at residence vehicle went into security lock mode and wont allow vehicle to start. All advice from individuals to "reset" security failed. Only option left is to tow to local dealer for service.
Related recalls
Electrical system › Ignition › Anti-theft › Control module
These vehicles were assembled with a malfunction alarm, lighting and locking (mall) module that can contain a damaged capacitor. If the capacitor is damaged, the "key in the ignition" warning chime and the driver seat belt unbuckled warning chime and indicator lamp May not work. This does not meet the requirements of FMVSS no.
Remedy: Dealers will inspect and, if required, replace the mall module.
Electrical complaints in other Bonneville years
Frequently asked questions
How common are electrical problems on the 1996 Pontiac Bonneville?
NHTSA has 21 complaints about the electrical system of the 1996 Pontiac Bonneville, 14% of the model year's 150 complaints. The component named most often is horn (2 mentions).
Is there a recall for 1996 Pontiac Bonneville electrical problems?
Yes — NHTSA recall 95V-204 (control module, Oct 23, 1995). Recall repairs are free at authorized dealers.
At what mileage do 1996 Pontiac Bonneville electrical problems start?
Half of the complaints with a recorded mileage happened before about 105,000 miles.
Is it dangerous?
Owners linked 0 crashes, 1 fire and 0 injuries to electrical system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.