Infamous ignition tumbler problem, now "Start Prevented Try Again" Topic is solved

[cn90]

Yes,

Antenna ring is intermittent, then dead.

[02V70]

I had the same problem. It was the antenna ring. I was able to get a used one on ebay for $30 to replace it with.

Part numbers 8621509 and 8673073 should both work. My car had the latter one and was replaced with the first one. They both seem to be identical.

[MoVolvos]

I've been through the infamous ignition switch tumbler problem. Read many posts. A while back did the lower plate removal, and tumbler cleaning. Worked great for a while with smooth key action and easy starts, but always came back to eventually sticking or getting hard to turn to position III. I've recleaned the tumbler with quick dry brake cleaner, blew out with compressed air and then added WD40 dry lube. Key now turns smoothly to III and then returns to II as it's suppose to. Problem is, all I'm now getting is "Start Prevented Try Again". I can remove the ignition switch on the left, turn the inset clockwise (like to start), and I get the same dash message. I've tried different keys, even the valet key (never used before), and get the same message.

Would disconnecting the battery for a period of time reset the lock-out?
Would my immobilizer be the root cause? How can I troubleshoot this?
I've read some say disconnect the battery and touch the + and - cables together. This seems risky but would this clear the lock-out?
Could it still be the ignition switch (8645226)?

I can head to a pick and pull for another immobilizer ring, but we will be in the mid 90's the next week and I'd like to avoid that. I'd also like to avoid replacing the entire tumbler as it seems to be working smoothly at the moment.

One last thing, 5sp mt so no transmission lock-out. Once she starts, I'm good to go...until the next key turn.

Thanks for any input or self experience you can add.

.
The quick dry brake cleaner may not have dried quick enough besides being harsh. Should use DeoxIT near or around electrical parts.

DeoxIT D5S-6 Spray, More Than A Contact Cleaner
https://www.amazon.com/CAIG-LABORATORIE ... B0BZ7J6MG1
.

[93SCMax]

Solution: Immobilizer antenna ring was bad, possibly contaminated when I cleaned the ignition tumbler. New OEM part (8621509) was $72.99 shipped from FCPEuro. Once installed, all three keys started the car with the 1st turn of the key.

Advice to those with ignition tumbler problems, remove the Immobilizer antenna before cleaning out the tumbler.

Thanks to all who offered advice.

[Krons]

Quick question, as I it relates to the items above in this thread. Kids 05 XC90 just started getting “Start Prevented Try Again” with the original key fob. Fob still will lock and unlock doors properly. Chipped valet key (no fob) starts car fine.

Is it possible for the immobilizer chip for ignition to fail, and the lock/unlock still work? For context, the original plastic fob was starting to fall apart, so I wonder if that could’ve damaged the chip on the little circuit board. Bought a $10 eBay plastic fob shell but now fob will not start at all, was intermittent previously. Lock unlock still works with the new fob shell.

[scot850]

It is not usually the 'transducer chip' that fails. It is in the small front part of the key fob that holds the flip key. Do you have another key that works? If so try that first. If that also does not work then it is more likely an issue with the antenna ring needing the connector pins cleaned or the antenna has failed.

You can buy transducer ships, but when we had this issue, we had to get Volvo to reprogram the fobs, but the only way they were able to d this was for us to buy another fob to get the packaging code then needed to initiate the re-programming. Not cheap. Maybe today with tech moving forward it can be done by independent guys without needing that code.

Neil.

[Krons]

It is not usually the 'transducer chip' that fails. It is in the small front part of the key fob that holds the flip key. Do you have another key that works? If so try that first. If that also does not work then it is more likely an issue with the antenna ring needing the connector pins cleaned or the antenna has failed.

You can buy transducer ships, but when we had this issue, we had to get Volvo to reprogram the fobs, but the only way they were able to d this was for us to buy another fob to get the packaging code then needed to initiate the re-programming. Not cheap. Maybe today with tech moving forward it can be done by independent guys without needing that code.

Neil.

The chipped valet key does work. Yet to have that fail so I do not think it is the antenna ring.

I dug the old fob shell out of the trash, I can’t see where the chip might be…maybe molded into the plastic? If so it would explain why the new fob shell with the old button circuit board would not work.

I may resort to buying another valet key from the dealer and attach to the new fob to at least have lock/unlock — if I recall right even the valet key was $250 with a new fob being closer to $450. I’ll get a quote tomorrow.

[DavidE7]

The transponder chip is inside a glass cylinder and it looks like a large grain of rice. This eBay listing has a good picture of the transponder: https://ebay.us/m/ghflvE Look for "ID48 Volvo transponder" if the listing is gone.

The transponder is buried in adhesive near the switchblade pivot on the top half of the key and it is very easy to break the glass when digging it out of the glue.

[br0dy519]

Good pic here:

https://andrewpeng.net/cars/2006-volvo- ... key-repair

[vtl]

Is it possible for the immobilizer chip for ignition to fail, and the lock/unlock still work?

These are two separate circuits. Immobilizer chip is MegaMos Crypto ID48, the remote fob is I forgot what. ID48 rarely fails, but fails. The blank chip itself was like $2 last time I looked, but Volvo upcharges you a lot.