Oh, normally multimeter leads have around 0.6 ohms resistance. To find out, touch the probes together and read the resistance and subtract this number from all your readings. Less than 1 ohm is good enough to pass through the pilot signal without any issues.

Pins 1 and 24 identified on board connector/Old charge port end Pins 1 and 24 identified on cable connector/Charge Port ECU (Gen4) end

In addition, you can check the rest of the Bundle of Wires just in case the error message is not correct. Use your multimeter and measure the pins based on the schematics. The pin numbers are part of the description of each signal (after the Xxxx- in the schematics. Old charge port is the connector on the board where as Charge Port ECU is the connector on the cable. All Bundles of Wire are 100% tested after assembly. If everything is correct, then the Gen4 ECU is suspect.

Yes, if you have a multimeter handy, you can measure the resistance of the pilot and ground lines. The pilot line passes straight through the Bundle of Wires without anything else connected to it. It's pin 16 as shown in the pics attached. If you measure the resistance from pin 16 of the 24-pin female connector on the cable to pin 16 of the 24-pin male connector on the board, it should measure basically 0 ohms. Do the same for the ground pin and the resistance should be 0 ohms. The ground is Pin 13 on the connector on the cable to pin 18 on the connector on the board. If both measures correctly, then the issue is not the Bundle of Wires and probably the Gen4 ECU based on the error message you are getting. 24-pin male connector on the board that the cable from the charge port plugs into 24-pin female connector on the cable that plugs into the Gen4 ECU. If your probe is not small enough to fit in the hole, use a staple or needle.

Thank you Bobby for the insight. I took your advice and held down the 2 button on the steering wheel to reset the computer. Everything loaded up and now, CCS ENABLED!!! Thank you! ak_potatoes On Aug 29, 2023, at 12:53 PM, Bobby wrote:  Hi ak_potatoes First time I’ve seen this.  It appears the firmware is having problems loading the firmware for the ECU for some reason.  This is strictly between ECU and firmware as the ECU hasn’t booted up to check the signals from the charge port or bundle of wires.  I would try reseating the connections at the ECU to make sure there’s a good connection and then reboot and reload the software.  Thanks! Bobby

One other thing, we did have a customer early on that had the same error on 250kW SC after about 5 min of charging. He had an early 2017 model 3 and turns out he had a prototype charging port and not a production version which we were guessing has different thermistor types. You said yours was 2019 so it's probably OK but if you don't mind sending me your VIN I can look it up in Tesla's catalog to double check. My email is bobby@2muchsun.com.

Hi David, I believe we got this error early on in our history of making these whenever one of the resistors wasn't connected due to a bad crimp but it was either it worked all the time or didn't. Since then we have instituted more rigorous testing before we ship and haven't had any issues relating to this. Maybe somehow you have an intermittent connection that somehow is coincidental to your low SOC. With the resistors, the ECU should see a much shallower rise in temp with the trigger high temperature being the same as what is considered unsafe so the ECU will always think the charge port is at a higher temp up until the higher trigger temp.. So getting this error does indicate some kind of disconnection of one of the resistors.. Because you swapped it back to the original config and it worked,, tells me it's not the SC or charge port hardware but more so either the Bundle or Gen4 ECU. To eliminate the Bundle, we can send you another one at no charge in about a week or so when we have more in stock to see if that fixes the issue. We'll check back with you when we receive more to see if that is what you want to do. Thanks. Bobby

No. This retrofit only works on Model 3s.

Some have reported a reboot of your car’s computer might help. Somehow the data on your car needs to be “uploaded” to Tesla’s server where the store can find it. It might just be a timed upload as well. Maybe also try again in 24 hours if you haven’t tried that already. Make sure you have good cell coverage for you car too.

CCS1 Adapter is now available at the Tesla Store but you must have CCS adapter support enabled first.

Here's a good link for some more options. https://teslamotorsclub.com/tmc/threads/new-sources-of-tesla-oem-tesla-like-and-or-third-party-ccs1-adapters.276848/

Saw this. https://www.facebook.com/groups/882220485316895/permalink/1917865461752387/

Looks like these guys have a third party version in stock and reasonably priced too. https://a2zevshop.com/en-us/products/a2z-thunderstorm-plug

From another post: "The Tesla CCS1 adapter opens up more opportunities for DC fast charging for Tesla owners, especially those of us who tow." Robert K

A reply from the same post - "Based on the Contact Info here (Contact Us), they seem to be affiliated with Hansshow, who sells the automatic frunk/trunk kits, among other Tesla mods. Based on the address, these would likely be shipped from China"

Another post - "No idea who these people are but just found this: Tesla CCS Combo 1 Adapter for USA DC Fast Charging"

Found another recent post - "Here’s another option also. Can’t speak to the legitimacy but these folks seem to have made their own version and currently taking preorders: A2Z EV SHOP - A2Z THUNDERSTORM PLUG - CSS1 150KW - FAST CHARGE ADAPTER"

Found this post which someone might try - "I've been in contact with harumio support team thru emails since they sold out. and they will attempt to purchase the ccs adapter from tesla korea using my tesla account info with there Korean credit card."