Have the CANbus sockets been replaced on my 2026 May model Juniper RWD Premium?

[mamixsystem]

New Model Y: Diagnostic Connector & Pin Change — Community Report

A plain-language summary of the change to the diagnostic (OBD/CAN) port on newer Berlin- (and US-/Shanghai-) built Model Y vehicles. All technical data is taken from Tesla's official electrical reference (service.tesla.com) and verified by comparing multiple production versions (SOP6–SOP11).

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Quick Summary (read this first)

The "the socket changed / the CAN bus changed" rumor going around forums is half true, half false. The reality, in one sentence:

The connector itself did not change. What changed is which CAN bus is wired to which pin inside it — and one CAN bus was removed from this port entirely and relocated to a new left-side port.

In other words:

• The connector part is the same (same part number, same model, same 20 cavities).
• On the right diagnostic port, the third CAN pair moved from pins 13–14 to pins 4–5.
• And the bus on those pins is now different: it used to be Chassis CAN, now it's Body CAN.
• Chassis CAN was not deleted from the car; it was moved to a new left-side port (X177).

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Which vehicles are affected?

The change rolled out factory by factory, in production batches Tesla calls "SOP." Per Tesla's official schematics, the build dates at which the new layout (new pinout + left port) begins:

Factory	New layout begins (Tesla official)	Production batch
Berlin	April 1, 2026	SOP10
Austin (US)	December 4, 2025	SOP10
Fremont (US)	December 9, 2025	SOP10
Shanghai	March 25, 2026	SOP11

So Tesla split diagnostic access into two:

• The right port now carries Party, Body, and Vehicle CAN.
• Chassis CAN moved to the new left port (X177) — and there it sits on the same pins 13–14, with the same green wires as in its old location. (In the new layout this bus connects to the Body Controller Left unit.)

Interesting point: the left port uses the same connector as the right port (same part number). That means an old, unmodified cable physically fits either port.

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4) What does this mean for aftermarket devices?

(For CAN-connected devices like the S3XY Knob/Commander, ScanMyTesla, etc.)

A CAN feature depends not on "the pin" but on which bus carries which message. Because of that:

• Most everyday functions keep working. Things like PRND, regen, mirror folding, climate, frunk, and cabin lights ride on Party CAN and Vehicle CAN — neither of which changed. This is exactly the "still works" part when an old kit is plugged into the new car.
• Chassis-CAN-dependent functions won't work from the right port, because that bus is no longer there. They require a second connection from the left port (X177).
• Since the third channel on the right port is now Body CAN, the device needs up-to-date firmware that reads that channel as Body CAN. Old firmware expects the wrong bus on that channel, so some functions won't work.

For DIY: Because the old car's cable connector fits the new car, moving the terminals from pins 13–14 to 4–5 (a repin) plus updating the device to current firmware gives the same electrical result as the cable the manufacturer now sells for new cars. If Chassis-dependent features are wanted, a separate cable is run from the left port (X177).

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5) Practical summary / ordering note

• If you're buying a device for a new car (Berlin, April 1, 2026 / roughly after March 30), choose the variant/cable labeled "Berlin after 30.03.2026" from the manufacturer. The price is the same as the regular Juniper variant; the only difference is the cable's pin arrangement.
• If you accidentally bought the old Juniper cable: since the connector is the same, you can either buy the correct cable separately, or repin it (move terminals 13/14 → 4/5).
• Verify by opening the cover (the reliable method): on a new car, pins 4–5 should be populated (violet wires) and pins 13–14 empty. On an old car it's the opposite (13–14 populated, green wires).

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Sources & verification

• Tesla's official electrical reference (connector part numbers, pinouts, bus names, production/SOP dates): service.tesla.com → Model Y → Electrical Reference. Every pin and connector fact in this report was verified from Tesla's connector_reference data by comparing multiple production versions (SOP6, SOP7, SOP8, SOP9, SOP10, SOP11). The old layout is identical in SOP7 and SOP8; the new layout begins firmly at SOP10 (SOP11 for Shanghai).
• enhauto product pages (factory/date cutoffs for cable compatibility): US after Nov 13, 2025; Berlin after March 30, 2026; Shanghai after April 25, 2026. (These match Tesla's official SOP dates for Berlin, but differ somewhat for the US and Shanghai.)

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This report is for technical information only. Before working on your car, it's recommended to physically verify your own build date and pin state.

[hypery11]

@mamixsystem — this is an excellent, well-sourced writeup; thank you for verifying it against Tesla's own connector reference across SOP6–SOP11 rather than the forum hearsay. It matters a lot for this project, because several of our open investigations assume the old X179 layout.

To make sure I've got it right, the load-bearing change for us:

• Connector unchanged (same part number, 20 cavities), but on post-SOP10 cars the third CAN pair moved from pins 13–14 to pins 4–5, and that pair is now Body CAN, not Chassis CAN.
• Chassis CAN was relocated to a new left-side port (X177) — pins 13–14, green wires, off the Body Controller Left.
• Rollout: Berlin from 2026-04-01 (SOP10), Austin 2025-12-04, Fremont 2025-12-09, Shanghai 2026-03-25 (SOP11).

This directly changes two things on our side:

1. Our HARDWARE.md documents Bus 6 on pin 13/14 and "Chassis CAN — EPAS/brake" on pin 18/19. For post-SOP10 cars that's wrong, and I'll add your findings as a clearly-dated section so people stop tapping the old pins on new builds.
2. We've been planning a Chassis Bus 3 Listen-Only capture to find where the nag/EPAS mechanism actually lives (see [bug] Nag killer not working on HW4 2026.14.6.x — need 0x370/0x39B captures #100). On a post-SOP10 car, Chassis is now on X177, not X179 pin 18/19 — so that capture needs the left port on those builds. That's a genuinely important correction to the plan.

One question, since you're on a 2026-May Juniper RWD (so post-SOP10): if you're set up to look, can you confirm on your car that pins 4–5 on the right port are populated (violet) and 13–14 empty? A single real-world confirmation of the date cutoff vs. the schematic would be valuable, and I'll cite it. Either way I'm crediting you in the HARDWARE.md update.

[mamixsystem]

First, thank you sincerely for the credit — it's much appreciated.
I should be upfront about one thing: I haven't taken delivery of the car yet — I'm expecting delivery to be completed by June 30. I put this work together as a community contribution and as prep for my incoming car: it's a draft, built with AI assistance and a lot of deep research. So it rests on a solid analytical basis, but it still needs physical confirmation.
As soon as I take delivery, I'll run all the tests you asked for and share the results — including confirming that pins 4–5 on the right port are populated (violet) and 13–14 empty. That'll give you a clean schematic-vs-real-world confirmation to cite.

[mamixsystem]

Verification Links (Tesla official)

Source pages in Tesla's service electrical reference, so the community can verify in one click:

Main index — the SOP10 = prog-289 and "Berlin 2026-04-01" mapping is shown on this page:
https://service.tesla.com/docs/ModelY/ElectricalReference/index.html
SOP10 right port X179 — pins 4–5 = Body CAN:
https://service.tesla.com/docs/ModelY/ElectricalReference/prog-289/connector/x179/index.html
SOP10 new left port X177 — pins 13–14 = Chassis CAN:
https://service.tesla.com/docs/ModelY/ElectricalReference/prog-289/connector/x177/index.html
Raw data (JSON) — the source file behind the pinout:
https://service.tesla.com/docs/ModelY/ElectricalReference/prog-289/interactive/json/connector_reference_export.json
Comparison — old layout SOP7 = prog-217, the same port (X179); still shows Chassis CAN on pins 13–14:
https://service.tesla.com/docs/ModelY/ElectricalReference/prog-217/connector/x179/index.html

Two notes: (a) On the connector pages the pinout is rendered in-browser via JavaScript — open the pages in a browser to see the pins and bus names; the raw "view-source"/curl output may not contain the pin-table text, whose raw form lives in JSON link (4). (b) service.tesla.com is Tesla's official service portal; these electrical-reference pages appear publicly accessible, but access conditions may vary by region.

This report is for technical information only. Before working on your car, it's recommended to physically verify your own build date and pin state.

[mamixsystem]

Tesla_ModelY_SOP10_Connector_Reference.xlsx

[hypery11]

Thank you for attaching the source reference — having the Tesla connector data itself (not just a summary) is exactly what makes this citable. It also dovetails with @jewelrylin's Service Mode CAN Port pull on #100: between your SOP10 reference and his harness 1933903-XX map, we now have two independent, authoritative confirmations that the X179 pin→bus mapping is not model-year-stable — so the only safe instruction is "read your car's Service Mode CAN Port page / check your harness PN." I've written that into HARDWARE.md. Much appreciated.