2004 Pontiac Montana
Key Replacement - Save vs Dealer in San Diego

Q: What is a transponder key and why does the engine stall if the chip isn't programmed?

The transponder chip inside the key head sends a signal to the vehicle's immobilizer when you turn the ignition. If the system doesn't get the right signal back, it cuts the engine. On a 2004 Montana, this usually shows up as the van cranking, firing briefly, and dying within one or two seconds. The security light on the dash is often the tell. A correctly cut but unprogrammed key will do exactly this every single time.

Q: Do I need to be present the whole time you're working on the key?

You need to be there at the start so I can verify ownership with your ID and registration, and at the end so we can test the new key together in front of you. Everything in between, you're free to do whatever. Most people step inside for twenty minutes and come back out to a finished job.

Q: My 2004 Montana starts and immediately stalls. The security light is on. Is this a key problem?

That pattern, starts and dies right away with the security light lit, points squarely at the immobilizer not recognizing the key's transponder chip. It's one of the more common calls I get on these vans. A few things can cause it: a worn or damaged chip in an old key, a replacement key that was cut but never properly programmed, or in some cases a fault in the immobilizer system itself.

Q: I lost both keys to my 2004 Montana. Can a new key still be made without the original?

Yes, all-keys-lost on a 2004 Montana is doable. It takes more work than adding a spare alongside an existing key, but it's a standard job. I decode the key cut from the lock, cut a new blade to the vehicle, and program the transponder chip through the OBD port without needing the originals. The process takes a bit longer than a simple spare, and the cost is higher than if you'd caught it with one key remaining.

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2004 Pontiac Montana lost key replacement options from EZ Car Keyz Imperial Beach CA

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2004 Pontiac Montana
Key Options

Dealer-grade key for a fair, honest price

Transponder Key

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✕ $$$$

Location

✓ We come to you

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Wait Time

✓ 20-45 min

✕ 2-5 days

Same-Day

✓ Yes

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All Keys Lost

✓ No problem

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✓ Yes

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2004 Pontiac Montana Transponder Key Replacement - Fast, Affordable & Professional

A guy in the Bayside neighborhood of Imperial Beach called me on a Tuesday afternoon. He had one key left for his 2004 Montana, and he'd already bent the blade slightly trying to get it out of a sticky ignition cylinder. The key still turned, but he could see it wasn't going to last forever.

He'd called the dealer first. The number they gave him was enough to make him put the phone down and start looking for another option.

I came to him. He was parked on the street outside his place, kids' bikes in the driveway, the van sitting there looking completely normal except for that slightly warped blade.

I decoded the cut from his existing key before it got any worse, cut a new blade to match, and programmed the transponder chip to the van's immobilizer through the OBD port. The whole thing took under thirty minutes. We tested both keys: his original bent one and the new spare. Both started the van. Both held in the ignition correctly.

He told me later he almost didn't call because he thought mobile meant a longer wait or that I wouldn't have the equipment. I had everything in the van. That's the whole point.

He saved a good chunk compared to what the dealer wanted, and he walked away with two working keys instead of gambling on the one beat-up one he had left.

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2004 Pontiac Montana

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What certified service looks like in reviews

E

Eddie E.

Sep 2026

★★★★★

“Thank you Marco! My landrover 2016 discovery key fob was damaged and Marco was able to replace it QUICK. Great and speedy service. Great price. Had all the right solutions and was able to solve the problem with ease.”

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Antoine M.

Dec 2025

★★★★★

“I am very pleased with the value of the service that I received from Marco with ez car keyz they came here mega fast and opened my door in no time also the price was right on point. Good stuff!!”

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Zachary H.

Nov 2025

★★★★★

“The dude was awesome! Showed up quick and even made me a spare free of charge would definetly recomend giving them a call”

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Customer review after losing 2004 Pontiac Montana key - EZ Car Keyz Imperial Beach CA

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Pontiac Montana Mobile Service FAQ

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Does the 2004 Pontiac Montana key have remote buttons, or is it just the ignition key?▼

The 2004 Montana transponder key is a turn-key for the ignition. It carries a transponder chip inside the head of the key that communicates with the vehicle's immobilizer every time you start the engine. There are no remote lock or unlock buttons built into this key itself. If the van has a separate key fob for door locks, that's a standalone remote, not part of the ignition key.