CriticalCommonBody & Rust

Mazda Mazda6: GG/GH Front Subframe and Engine Cradle Corrosion

GG/GH Front Subframe and Engine Cradle Corrosion is a common body & rust fault on the Mazda Mazda6 on the 2002–2012 cars, and we rate it critical. Putting it right costs $1,200 to $4,500 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 48 documented faults on the Mazda Mazda6.

Vehicle: Mazda Mazda6
Years: 2002–2012
System: Body & Rust

This page covers the Mazda Mazda6 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Mazda Mazda6 faults48 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Body corrosion yet. We would rather show none than show a picture of a different part.

What goes wrong

The front subframe (engine cradle) on GG and GH Mazda6 models is fabricated from mild steel with minimal corrosion protection on inner surfaces and weld seams. In New Zealand and Australian coastal or high-rainfall environments the subframe rusts from the inside out, with perforation appearing at lower control arm mounting points and the rear cradle crossmember. Severe cases result in structural failure of the mounting points, causing steering geometry changes or control arm separation. Several GG models failed WOF inspection for subframe integrity at relatively low ages.

What you would notice

Surface bubbling or orange rust visible on the underside of the front subframe, particularly at lower control arm bolt locations
Clunking or knocking from the front suspension that cannot be attributed to worn bushes or ball joints alone
Steering wander or toe angle drift caused by subframe mounting hole elongation from rust
WOF rejection for structural corrosion at front subframe or control arm mounting points

How to check it

Where to look. Front underfloor, engine cradle/subframe spanning between lower control arm mounting points

Pay particular attention to: the rear crossmember of the cradle, control arm mounting pockets (where rust hides inside the tube section), and weld seams. Probe any surface rust with a screwdriver — if it penetrates more than 2 mm the metal has lost structural integrity. Check WOF/COF history for any advisory notices related to underfloor corrosion. If a workshop inspection is possible: Place the vehicle on a hoist and inspect the entire front subframe with a torch and a metal probe.

Parts involved: Body corrosion.

What it costs to put right

$1,200 to $4,500 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

“Can I have the car inspected on a hoist before purchase, specifically looking at the front subframe?”
“Has the car spent most of its life in a coastal area or been driven on unsealed roads?”
“Is there any WOF history showing advisory notices for underfloor corrosion?”

Now check the Mazda Mazda6 you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Mazda Mazda6 buyer questions

Is gg/gh front subframe and engine cradle corrosion serious on a Mazda Mazda6?

We rate it critical and common on the Mazda Mazda6. The front subframe (engine cradle) on GG and GH Mazda6 models is fabricated from mild steel with minimal corrosion protection on inner surfaces and weld seams. In New Zealand and Australian coastal or high-rainfall environments the subframe rusts from the inside out, with perforation appearing at lower control arm mounting points and the rear cradle crossmember. Severe cases result in structural failure of the mounting points, causing steering geometry changes or control arm separation. Several GG models failed WOF inspection for subframe integrity at relatively low ages.

How much does it cost to fix on a Mazda Mazda6?

$1,200 to $4,500 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Mazda Mazda6 years are affected?

Our research records this fault on the 2002–2012 Mazda Mazda6. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.