Genuine vs aftermarket towbars: What happens to your warranty?

An aftermarket towbar can save you hundreds of dollars compared with a dealer-supplied package. But for anyone with a vehicle covered by manufacturer warranty, that saving raises an obvious question: are you putting the vehicle warranty at risk?

It sounds like a choice between cheap and safe. It is not.

Will an aftermarket towbar void your warranty?

Fitting an aftermarket towbar does not automatically void your new-vehicle warranty.

What matters is whether the towbar, wiring or installation caused the claimed fault. If poor wiring damages a body control module, the manufacturer may reject that repair. If an unrelated engine component fails, an aftermarket towbar is not grounds to cancel your entire warranty.

Ford Australia states this directly: using an aftermarket product will not necessarily void its warranty, although the product and damage it causes may not be covered. Your Australian Consumer Law rights also continue regardless of a voluntary manufacturer warranty.

There is still a practical difference. With a genuine package, the dealer is usually your single point of contact. With aftermarket, the manufacturer, supplier and installer may need to establish what caused a problem. That makes product and installation quality important, not the badge itself.

Do you need genuine wiring and dealer coding?

The next warning is usually about electronics: a modern ute needs genuine wiring, dealership coding or both.

Modern trailer wiring is more complicated than joining a few lighting wires, but there is no dealership-only magic involved.

A powered module can supply the trailer lights without loading the vehicle's lighting circuits. Trailer recognition may then change functions such as reverse park assist or trailer stability program. That signal can come from the socket, vehicle network or software coding.

The current Isuzu D-MAX and Mazda BT-50 provide a useful example. TAG's direct-fit harness includes a seven-pin socket with normally open reed-switch circuits. When the trailer plug is inserted, the reed switch signals to the vehicle that a trailer is connected, and the vehicle then applies the factory-built settings changes such as disabling or adjusting relevant driver-assist functions. This same principle applies whether the signal comes through a TAG wiring harness or a genuine manufacturer harness. The vehicle is simply responding to the trailer detection input using the logic already built into its systems.

The Ford Ranger uses a different approach. TAG's current Ranger harness operates without coding, with reverse park assist switched off manually. Optional coding lets supported functions respond automatically. Coding is not a dealership-exclusive function; it is routinely carried out by qualified mechanics and aftermarket installers as part of normal vehicle electrical work, and trailer wiring is no different in this respect. TAG supplies aftermarket accessory fitting workshops with a specialised coding tool for this very purpose.

Why genuine may still make sense

The strongest argument for genuine is often not the steel. It is simplicity. The dealer can organise the package before delivery, finance it with the vehicle and provide one point of contact. And for some people keeping their Hilux all Toyota or their Ranger all Ford is a preference not worth compromising on.

Genuine accessory coverage can also be strongest before delivery. The less obvious point is that the same coverage may not apply if you return later.

Isuzu UTE Australia's D-MAX accessories page, for example, states that Genuine Accessories fitted by an authorised dealer at the point of sale of a new vehicle are covered for three years or 100,000km. After delivery, that falls to one year or 40,000km when dealer-fitted, or one year/20,000km when fitted elsewhere.

Genuine is therefore particularly attractive in a new-vehicle deal, but less decisive when you add a towbar later. At that point you are comparing a smaller genuine product warranty against an aftermarket one from TAG Towbars, which comes with a lifetime structural warranty for as long as you own the vehicle.

Even "dealer-fitted" does not always mean genuine. Ford distinguishes Genuine, Licensed and Supplier Branded Accessories. The last category is sold through dealers but warranted by its manufacturer. Ask whose product is in the quote.

OEM warranty information in this article is correct as at August 2026. Terms and eligibility can change, so check the linked manufacturer information before purchase.

Where aftermarket earns its place

Price gets aftermarket onto the shortlist, but functionality can make the decision.

Vehicle manufacturers generally design for the most common customer. A towing specialist can also develop for extended trays, cab-chassis bodies, rear steps, higher clearance and rated recovery points. Receiver depth, ball height, step position and more specialised towing equipment can all matter with your actual trailer setup, and it's these problems the aftermarket can solve for you.

TAG has developed towing products in Brisbane since the late 1970s. Its work covers vehicle scanning, CAD design, prototyping, in-house ADR testing and finishing. The range includes TAG Standard Duty, TAG Heavy Duty, TAG Extended, Rear Step and TAG XR Extreme Recovery towbars, plus vehicle-specific and CAN-bus wiring designed and tested in-house. All are tested to the same ADR 62/02 standard that genuine towbars comply with.

The point is that you have a choice. There are reasons to choose genuine, and reasons to choose aftermarket. Choose whatever meets your requirements best, and don't be afraid to trust quality aftermarket products over genuine parts.