TextHow Bonneville Key Security Evolved
VATS Mechanical Key
This is old-school GM security at its most basic. Your Bonneville uses a VATS key, which is a standard metal key with a tiny resistor pellet embedded in the blade. The car reads that pellet's resistance value before it lets the engine crank. There are 15 possible resistance values, so the right key has to match exactly or you get nothing.
Transponder Chip Key
This is where security got serious. GM switched your Bonneville to a transponder key with a Megamos 13 (ID13) PK3 transponder chip inside the plastic head. The chip talks to the Pass-Key III immobilizer every time you turn the ignition, and if the codes do not match, the car will not start. Programming happens through the OBD-II port, which means we plug in, write the key, and you are good to go.
Which Key Does Your Bonneville Use?
A metal key with a small resistor pellet visible in the blade. No electronics, no battery. The car reads the pellet's resistance to verify it is the right key.
Looks like a regular key but has a computer chip hidden inside the plastic head. That chip communicates with your car's immobilizer every time you start it. No battery needed because the chip is powered by the ignition antenna.
Pricing by Generation
All prices include key cutting, programming, and on-site service in Ventura County.
EZ Car Keyz vs. the Dealer
Same quality key, same programming result. We just skip the tow and the markup.
Skip the Dealer - Call (805) 790-8162Common Bonneville Key Problems
VATS Key Resistance Failure (1995-1999)
The resistor pellet in your VATS key degrades over time. The tiny chip in the metal blade wears or cracks, the car reads wrong resistance, and refuses to crank. Sometimes works, sometimes does not, the classic sign. We cut a new VATS key matched to your car.
Ignition Lock Cylinder Wear (1995-2005)
First we check whether the problem is the key or the ignition cylinder. The column-mounted cylinder on these Bonnevilles loosens after years of use. If key sticks, needs extra force to turn, or feels sloppy, the cylinder is worn. We replace it on-site without a trip to the shop.
Transponder Programming Issues (2000-2005)
Key turns, engine cranks, will not fire, security light on. The transponder is failing immobilizer comm. Aftermarket keys are a common culprit; cheap blanks with the wrong chip type will not program through OBD-II. We use OEM-spec blanks and verify chip match before cutting.
Remote Keyless Entry Module Failure (1995-2005)
Owners think the key fob battery died when the remote stops. But if you replaced the battery and it will not respond, the door receiver module inside the car has failed. Your mechanical key works for starting and manual locking. We diagnose fob vs module so you're not guessing.
Can You Program a Bonneville Key Yourself?
No DIY option here. VATS keys require matching the exact resistor value and cutting the blade, which takes professional tools. You need a locksmith or dealer for this one.
If you already have a pre-cut transponder key with the correct chip, you can run GM's 10-minute relearn procedure. You cycle the key to ON three times, waiting 10 minutes and 30 seconds each cycle. It works, but the timing is strict, it erases all previous keys, and if you get it wrong you wait an hour and start over. Most people call us after the second failed attempt.
You can pair a new remote fob yourself if you have a working ignition key. Hold the lock and unlock buttons for about 15 seconds until the car responds. This only programs the remote, not the transponder chip.
How It Works
Call Us
Call (805) 790-8162 and tell us your Bonneville's exact year.
We Drive to You
Whether you are in Oxnard, Simi Valley, or Camarillo, we come to your location.
Cut and Program
For 1995-1999 models, we measure your VATS resistance value and cut a matched key on-site.
Related Services
Did You Know?
Back in 2000, Pontiac made a significant security leap with the Bonneville. The 1995 to 1999 models were among the last full-size American sedans to use the passive VATS system, which relied on a tiny resistor pellet in the key blade to verify the driver. When the 2000 model year arrived, GM switched to transponder-based immobilizers, marking one of the clearest generational shifts in automotive security technology during that era.
KEY REPLACEMENT ACROSS ALL OF VENTURA COUNTY
We come to you, anywhere in Ventura County. No shop visit, no towing. Our mobile locksmith arrives at your home, office, or roadside.
Watch Us Work
See a real Pontiac key replacement in action
Need a Pontiac Key? Call Now
Mobile locksmith serving all of Ventura County. We come to you.
