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Ez pass problems

My ez pass is not being recognized since placing it in my model s, was fine in the BMW. Worked when holding it out the passenger window. Anyone else experiencing this, any theories?

Sure will. Will get them to do a hand-held test on Monday. Will try and hit the turnpike too.

The external transponder costs the same ($26) as a mobile, windshield-mounted suction cup transponder - in fact I traded my suction cup one in for this one for zero cost. The TM guys said they'd tried the suction cup version in the nose cone and it didn't work.

Unless TM has developed RF-impermiable plastic, it's gotta work!

I finally had an opportunity to test the externally mounded transponder today - worked like a charm!!!

This is by far the best solution. You can even do it yourself if you have the nerve to pop the nose off. Or you can ask TM to do it - they did it for free for me.

If you use a plastic tool you can insert it where the arrow points below and lever the nose cone. It should start to come away from the car. It is held on by a dozen or so automotive push clips. It takes a bit of force, but it does come off.

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We used double-sided tape to stick the transponder to the front face of the steel bumper, then used cable ties just in case. You could drill/tap the bumper itself. Your call.

@nickjhowe: Thanks for solving this mystery, definitely gonna go this route. I'm always nervous about automotive clip fasteners. don't know once you unhook will they rebook again, so will touch base with service center about helping install it. Then I guess I need to call Sunpass about the dozen or so tolls I owe them while figuring out all the locations that the suction cup transponder doesn't work.

I have two CA Fastrak transponders shared by our three cars. If I hold the transponder up inside my BMW 335i, passing the toll has no problem at all. However, doing the same inside my MS, the transponder could not be recognized. Since it is not an option for me to permanently attach one of the transponder to MS, I wonder if I hold the transponder outside the window each time passing the toll, will it work?

has anyone tried - or can they confirm/deny - the transponder in the "back window" works?

just a random thought.

My New Jersey EZ Pass (green colored) works right under the rear view mirror.

"I wonder if I hold the transponder outside the window each time passing the toll, will it work?"

Open the roof and hold it up.


Thanks for your tip and will give a try (hopefully the wind won't blow my transponder away!). -:)

@bobinfla - Byrone at the Dania service center used to work on Porsches, BMWs,... he says the clips on the S are the best he's seen. Other mfg's clips always used to break; he says TMs are much more resilient. But better safe than sorry...

@dortor - might work on the Turnpike/I-95, but I also use it at Miami Airport parking. There you have to pull under the sensor and get the transponder read before the gate will rise. In the back window I think the roof would block the line of sight - but it might work.


This location is working for my battery operated FasTrak.

Under the hatch with proper angle and alignment through the rear window, yet not visible from the outside. The recessed area makes it easy to find and mount with the Velcro provided.

The mirror mount location WORKS PERFECTLY. Here is a photo:

I received a response from "The Toll Roads" today. Please DISREGARD MY SUGGESTION of the rear hatch location. While it works and it's not on the glass, the Highway Patrol could be upset. Here is the reply:

"Thank you for contacting The Toll Roads.

In accordance with the California Vehicle Code, it is not permitted to place the transponder in the rear window.

The internal transponder may be placed on the lower left-hand side or right-hand side of your windshield or behind the rear view mirror where it will not obstruct your sight while driving.

At times, we have found that the polarized windshields have prevented the internal transponder from reading at all times. Therefore, it may be necessary to replace your internal transponder with an external one.

This recommendation is presented in situations when the internal transponder fails to read while properly mounted and generates a significant number of tolls which are paid by the license plate number instead of the transponder number.

The external transponders mount directly to the front license plate brackets and are secured with tamper-resistant screws. A special tool is provided in order to remove/affix the external transponder."

The small NJ EZPass works great when affixed just above the rear view mirror to the plastic rear view mirror base. It has worked perfectly on the N J Turnpike and Commodore Barry Bridge.


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I live in Florida and so far I was successful in mounting my transponder right below the rear view mirror base. The transponder I used is a pretty narrow long rectangular one that I bought online from sunpass for $25. I will test it out this whole week. We will see if it works all the time.

Confirmed today that the location below the rear view base works well. I'll be mounting it there. thanks for the research on this!

If you have a long narrow device as we have in Washington state (shape of a popsicle stick), it works well on the top horizontal surface of the rear view mirror itself. A good fit, and nearly invisible.

@ pablodds, please let us know if you get the Florida Sunpass transponder to work on regular basis through the windshield. I have not much luck. Have adopted a temporary fix-putting the small transponder with the suction cups on the inside surface of the driver side outside mirror when using sunpass routes. The suction cups adhere well to the flat metal surface, no problems with falling off, even on bumpy roads, and easy to remove. But of course need to remove when parking for security, and not reommended for rainy days.

Never mind my last post, the sunpass does not always work with temporary fix so will try again under rear mirror on windshield. By the way, sending this from vehicle while in parking lot, very cool to be able to send messages from car, features like that sure make up for small issues like sunpass inconvenience.

@jbd: The external mount Sunpass can be mounted under the nosecone and works like a charm. Only issue is if you are in South Florida and need to be able to disable the Sunpass in the bag when you get free tolls for EV on the 95 expressway. The external pass has to be ordered direclty from Sunpass, not available in any stores, then takes about a week to arrive in the mail. Tesla Service center in Tampa was nice enough to pop the nosecone, drill a couple holes and mount it for me.

I have tried various places on the windshield, none of which worked. I tried the external EZPass inside the nosecone and that did not work. I have not yet tried above the rearview mirror. I have had 100% failure at the Throgs Neck and Whitestone bridge tollbooths. Has anyone had success with any mounting locations in going through any NYC tollbooths?


I have tried mounting the EZ pass right on the inside of the nose cone itself, rather than putting it on the steel/boron bumper. This seen s to wrok 50 to 60% of the times.

@ DouglasR

Did you just use the Velcro that came with your pass?

Is the bar code on the driver's or passenger's end on your mirror?

Seems like the location 3146 point out works for me as well, right above the mirror on the plastic base. Mounting is an issue, so far i have zip tied it (see pics, link below), may try velcro straps for cables. Anyone else have better mounting ideas?

I mounted mine slightly towards the left on the more flat plastic cover using the adhesive Velcro supplied with the pass. Left side of pass "floats" in the air but right side plus an added pieced of Velcro have so far held it and I'm 3 for 3 for it working through Virginia's ez pass system.


Yes, I just used the Velcro that came with the pass. The smooth side is up, the Velcro side is down (obviously). The bar code is at the driver's side of the mirror (the "G" is to the passenger's side), but I doubt very much that it matters. It is basically centered along the top edge of the mirror, and you have to look pretty hard to see it.

Other types of passes may not fit very well at this location. The Good to Go "popsicle stick" pass is about 5 or 6 inches long and about 5/8 inch wide, and quite thin. It is mounted with Velcro so that it can be easily removed to use with a different vehicle or where it would result in unnecessary charges.

@ DouglasR

Thanks for confirming my hunch. On;y one more week before the paper tag expires and the G2G starts collecting for the new bridge!

My recommendation is to also register your license plate. That way, if the pass isn't recognized, you will pay just 25 cents more (rather than a huge late fee, etc.). However, mine hasn't failed yet, and I've crossed the bridge maybe a dozen times.

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