Quick answer: The BYD Shark 6 needs a vehicle-specific trailer wiring harness with an anti-error CAN module — not a spliced universal kit — to avoid dashboard fault codes. The EVparts4x4 harness starts at US$220 for the AU 7-pin variant and is plug-and-play at the factory tail-light connector, no wire cutting required.
Does the Shark 6 need a harness?
The BYD Shark 6 ships from the factory with a built-in 7-pin flat connector that follows the AS4177.5 Australian standard, so if your trailer also runs a 7-pin flat and you are towing something light — a small box trailer under 750 kg GTM with no brakes — you may be able to plug straight in without any additional wiring.
The moment you step up to a caravan or a larger trailer with electric brakes, that factory 7-pin is only part of the story. Trailers over 750 kg GTM require brakes per ADR requirements, and trailers over 2,000 kg GTM need electric brakes plus a breakaway system. The 7-pin flat handles lighting circuits only; the brake controller signal is a separate job and needs its own harness routed into the cabin.
Owners towing a van or a big box trailer also run into a second issue: the Shark 6 has a CAN bus-managed electrical system. Splice a generic universal kit into the tail-light wiring and the body control module will often throw fault codes, trigger towing-mode weirdness, or flag a short-circuit warning on startup. A vehicle-specific, CAN-safe harness is the correct starting point — not an optional upgrade.
Which harness fits the Shark 6?
Not every harness marketed as compatible with the BYD Shark 6 actually matches its connector pinout without modification — this is the real owner pain point, and it costs people time and fault codes they did not expect.
The Vehicle-Specific Trailer Wiring Harness Kit with Anti-Error CAN Module is the harness we stock specifically for the Shark 6 AU market. It is a true OEM T-adapter that connects at the factory tail-light or reserved plug — no wire cutting, fully reversible, and warranty-safe.
The BYD Shark 6 AU 7-pin variant is priced at US$220; if you need a custom pin configuration, a vehicle-specific order (leave your Year, Make, Model, and Pin-Type in the checkout note) is US$330. Order two sets and you receive 10% off, three sets gets you 15% off.
The kit includes an anti-error CAN module that prevents dashboard fault codes, provides short-circuit and over-current protection, fog-light soft start, and an ACC feed. Installation requires no drilling — a bolt-on 3 mm bracket, CE and RoHS certified, and the whole job takes 30 to 60 minutes for a competent DIYer.
The socket follows the AU/US 7-pin SAE J2863 standard; if your caravan runs a 13-pin ISO 11446 (common on newer European-sourced vans), a standard 13-to-7 adapter bridges the difference cleanly.
Generic harnesses from AliExpress may list the Shark 6 as compatible, but several owners report that the pinout does not match the Shark 6's reserved connector without modification. We cross-check our listings against factory mounting points before adding them to stock — that is why this harness is listed as a named variant rather than a catch-all universal.
If your Shark 6 towing setup also needs electric brake control, read our BYD Shark 6 bull bar and full towing setup guide for context on how the front and rear electrical systems interact.
Shark 6 trailer plug pin-out
The BYD Shark 6 uses the AS4177.5 7-pin flat connector as its factory trailer socket — the table below maps each pin to its function and the wire colour used in the Shark 6 loom, based on BYD technical documentation and verified fitment data.
Pin 6, the electric brake feed, is the critical pin for anyone adding a brake controller harness. If your trailer has electric brakes and Pin 6 is not wired through to a dedicated brake controller in the cabin, the brakes will not activate — a serious safety gap on a vehicle rated to tow up to 2,500 kg ATM (per the owner's manual for the Performance variant; check your handbook for the Standard variant figure).
The lighting harness covers Pins 1 through 5 and Pin 7; Pin 6 requires the separate brake controller harness and, for most Australian towing setups, the input of a licensed auto electrician.
Wire colours listed below are specific to the BYD Shark 6 and should not be assumed to match a generic AS4177.5 reference — always probe with a multimeter before connecting any aftermarket device.
| Pin | Function | Wire Colour (Shark 6) |
|---|---|---|
| 1 | Left turn signal | Yellow |
| 2 | Reverse lights | White |
| 3 | Earth / Ground | Black |
| 4 | Right turn signal | Green |
| 5 | Tail / Running lights | Brown |
| 6 | Electric brakes (brake controller feed) | Blue |
| 7 | Stop lights / Brake lights | Red |
Installing the harness
The plug-and-play design of the EVparts4x4 CAN harness means the install starts at the factory tail-light or reserved connector at the tow bar — you unplug the factory plug, insert the T-adapter, and the harness taps the signal without touching a single wire in the factory loom. The install is fully reversible if you sell the vehicle or need to return it to dealer condition.
From the tow bar the harness routes into the cabin through an existing conduit or grommet — most Shark 6 owners run it alongside the existing rear wiring conduit rather than drilling a new entry point.
The cable run from the rear bumper to a centre-console or under-dash brake controller position is typically in the range of 3 to 5 metres depending on routing; confirm against your specific setup before ordering a cable extension.
The seven-step process mirrors the product installation tab:
- Park on level ground and isolate 12V accessories.
- Locate the factory tail-light plug at the tow bar.
- Disconnect the factory plug and connect the T-adapter harness.
- Mount the anti-error CAN module to the bracket using the supplied bolt-on hardware — no drilling.
- Route the harness loom to the cabin via the existing conduit.
- Connect the 7-pin trailer socket to the harness output.
- Reconnect the vehicle and test all lighting circuits before towing.
A correctly wired Shark 6 tow harness is also the prerequisite before any tow mode troubleshooting — if the harness is wrong, tow mode diagnostics are unreliable.
We recommend an auto electrician handle the final cabin-entry routing and brake controller connection if you are not comfortable working near the body control module connector. That is a standard recommendation on any PHEV with a live CAN network, not a reflection on your ability.
Tow mode and wiring
Tow mode on the BYD Shark 6 is software-managed — it is not a physical switch that activates when you plug in a trailer, and that difference has caught a number of Australian owners off guard.
On the Performance variant in particular, tow mode interacts with the brake controller signal on Pin 6. If that pin is not wired through correctly — or if the harness feeding it is a spliced universal that the CAN module has flagged as a fault — tow mode can fail to activate, activate intermittently, or behave differently than expected.
Owners have reported erratic tow mode behaviour that turned out to trace back to wiring rather than software.
OTA updates have addressed specific tow mode activation bugs on the Shark 6 as of 2026, and BYD has pushed at least two updates that owners in Australian communities credit with resolving critical software-side towing issues. Before assuming a wiring fault, confirm your current firmware version through the vehicle's infotainment system.
Some owners have reported using workarounds such as setting SOC to a specific percentage to coax tow mode into activating — we do not endorse that approach. Correct harness fitment and current firmware are the supported path.
Owners regularly covering 300 km or more between stops — a realistic scenario touring regional Australia — need tow mode to activate reliably every time, not respond to a workaround that may behave differently after the next OTA update.
CAN bus fault codes are a real risk with universal harnesses: Splicing a non-CAN-safe universal harness into the BYD Shark 6 tail-light wiring can trigger persistent fault codes, towing-mode errors, and short-circuit warnings from the body control module. Use a vehicle-specific T-adapter harness with an integrated anti-error CAN module. If fault codes appear after any harness install, have a licensed auto electrician inspect before towing.
Pre-purchase checklist
Before ordering a Shark 6 trailer wiring harness or towing electrics kit, work through the following questions — they cover the fitment variables that generate the most incorrect purchases in the Australian market.
First: which Shark 6 variant do you have, Standard or Performance? The Performance model is the variant rated for higher ATM towing; connector configurations can differ between variants, so confirm before ordering. Second: what plug does your trailer use? The 7-pin flat AS4177.5 is standard on most Australian caravans and trailers built after the mid-2000s.
Older trailers may use a 7-pin round or a flat-4, both of which need an adapter at the trailer-side socket. Third: does your trailer have electric brakes? Any caravan or trailer over 750 kg GTM in Australia is required to have brakes; most over that threshold use electric override or electric drum brakes.
If yes, you need a brake controller and a separate brake controller harness in addition to the lighting harness — the lighting harness covers Pin 5, tail lights, turns, and stops only; it does not send a brake controller signal. Fourth: is your tow bar dealer-fitted or an aftermarket unit?
Aftermarket bars occasionally reposition the factory connector bracket, which may require a short extension or bracket relocation before the T-adapter seats correctly.
The Vehicle-Specific Trailer Wiring Harness Kit with Anti-Error CAN Module covers the lighting side for the Shark 6 from US$220.
For a broader look at what Australian Shark 6 owners are adding before a Big Lap or regional towing run, the BYD Shark 6 accessories guide covers tub protection, storage, and recovery gear in one place.
Fitment check
Confirmed compatible with: BYD Shark 6 Standard 2026 (AU), BYD Shark 6 Performance 2026 (AU).
Confirm your Shark 6 variant (Standard or Performance) and whether your tow bar is dealer-fitted or aftermarket before ordering, as connector position and bracket requirements can differ between setups.
FAQ
Does the BYD Shark 6 have a trailer plug already fitted?
Yes — the Shark 6 ships with a factory-fitted 7-pin flat connector at the rear following the AS4177.5 Australian standard. If your trailer uses a different plug type, or if you need a brake controller signal routed into the cabin, an additional harness is required.
Will a universal trailer wiring kit work on the BYD Shark 6?
Universal splice-in kits are a known source of fault codes and tow-mode errors on the Shark 6 because the vehicle runs a CAN bus-managed electrical system. A vehicle-specific T-adapter harness with an anti-error CAN module is the correct fit — it connects at the factory plug without cutting any wires.
Does the trailer wiring harness activate the electric brakes?
No — the lighting harness covers tail lights, turn signals, stop lights, and reverse only. Electric trailer brakes require a separate proportional brake controller and a dedicated brake controller harness routed into the cabin; these are two separate jobs under Australian towing law.
Why is tow mode not activating on my BYD Shark 6?
Tow mode on the Shark 6 is software-controlled and interacts with the brake controller signal — incorrect or absent wiring on Pin 6 is a common cause. Check that your current firmware is up to date via the infotainment system, then verify the harness pinout before assuming a software fault.
How long does the Shark 6 trailer plug install take?
The plug-and-play CAN harness typically takes 30 to 60 minutes for a DIY install — no drilling, bolt-on 3 mm bracket, and fully reversible. Routing the loom into the cabin for a brake controller connection adds time and is best handled by a licensed auto electrician on a PHEV.
Recommended parts
Proportional Electric Brake Controller
The harness powers trailer lights only — for a caravan or trailer with electric brakes over 2,000kg GTM you also need this.
$338.00
Related reading
Source: BYD Australia
