I am posting this to share my experience and to ask whether other Ford owners have encountered a similar issue.



I own a Ford vehicle that has been regularly maintained and driven under normal conditions. Recently, during an inspection, I removed the factory-installed underbody shields and discovered significant structural rust underneath, including on chassis components that are supposed to be protected.



What concerns me most is that:

• The rust developed behind factory shields, not on exposed parts
• These shields are advertised as protection, yet moisture and debris were clearly trapped inside
• From the outside, everything looked normal — the corrosion was hidden and invisible to the owner
• The affected areas are structural, not cosmetic

When I raised this issue with the dealer and manufacturer, the response was disappointing.

I was told this was due to “external environmental factors” and therefore not covered, despite the fact that the corrosion occurred in areas designed and enclosed by Ford’s own protective components.



From an engineering perspective, this raises serious questions:

• If a protective shield traps moisture and accelerates corrosion, is it truly “protection”?
• How is a consumer expected to prevent or even detect corrosion in sealed areas?
• Should responsibility be shifted entirely to the owner when the design itself creates the condition?

This is not about abuse, neglect, or extreme usage.

This is about design, materials, and accountability.



I am sharing photos and documentation to be transparent and factual.

My goal is not to attack, but to seek fair treatment and to warn other owners to inspect areas they may assume are protected.



If other Ford owners have experienced similar underbody or hidden corrosion issues, I would appreciate hearing your stories.

Visibility matters, and silence only benefits the party that refuses responsibility.



Thank you for reading.



Photos available upon request / Attached below.

 

Something to consider
If we drove in a pristine environment corrosion might not be a factor, but since we drive on salted roads and that salt dust can and DOES get into hard to see places, every time it gets reactivated by moisture,it does it's dirty work, corrosion.
Even under car washes can't completely stop this Years back a vehicle could be undercoated to prevent this, but today we don't do it anymore unless specifically requested and PAID for.
One of the most important things to check when buying a used vehicle is UNDERNEATH !
The vehicle can look great outside, but underneath is a disaster and folks don't look there.
ANY vehicle, not undercoated when purchased, and driven on salted roads is subject to that corrosion and we don;t see that until it is too late.
The manufacturer has produced some parts that are corrosion resistant, but not corrosion proof !
Vehicle inspection can pick up on these problems and when safety is involved, will not pass inspection and usually get traded or sold to an unweary buyer.

 

Thank you for taking the time to share your perspective.



I understand that road salt and environmental exposure can contribute to corrosion, particularly in certain regions. My concern here, however, is more specific. The corrosion I am describing developed behind factory-installed underbody shields, in areas that are intentionally enclosed and not accessible for routine inspection or maintenance by the owner.



In addition, this corrosion occurred while the vehicle was still within the manufacturer’s warranty period, yet warranty responsibility was declined.



It may also be helpful to clarify that this vehicle is operated in a non-salted-road environment, where de-icing salt is not used. This is why the presence of corrosion in sealed or shielded areas was particularly unexpected.



My intent is not to dismiss environmental factors in general, but to understand whether the design and sealing of factory protective components could unintentionally create conditions that trap moisture or contaminants, potentially accelerating hidden corrosion even under relatively mild operating conditions.



I appreciate any technical insights or similar experiences others may be willing to share.

 

Did you ask just what that shielding was supposed to protect ? I believe it is to protect the bottom of the engine from receiving damage if we run over an object in the road which could puncture the oil pan and result in a blown engine and not corrosion prevention.

The pix show what would be minor rusting from moisture which the shielding is not there to prevent.
If there is severe rusting , could you please post some pix of that, thank you.

 

Thank you for the clarification. I fully understand and agree that the primary purpose of the underbody shielding is impact protection rather than corrosion prevention.



I would also like to clarify that my concern is strictly limited to corrosion that developed while the vehicle was still within the manufacturer’s warranty period. If similar corrosion were to occur after the warranty expired, I agree that it would not reasonably be Ford’s responsibility.



What makes this case concerning is that the corrosion occurred behind factory-installed protective components, in an area not only covered by an underbody shield but also further protected by an additional heat insulation layer. These layers intentionally prevent direct exposure to road debris, moisture splash, and routine environmental contact, and they also make the area inaccessible for owner inspection or maintenance.



Because of this design, any corrosion developing in such a location during the warranty period raises legitimate questions about material selection, drainage, ventilation, or moisture entrapment created by the factory-installed components themselves — rather than normal external exposure or owner neglect.



I am not suggesting that underbody shields are designed as rust-proofing devices, but rather that when factory-installed protective and insulating layers unintentionally create a micro-environment that accelerates hidden corrosion, responsibility during the warranty period should be carefully considered.



I appreciate technical perspectives on whether similar issues have been observed by others, particularly in non-salted-road environments such as Taiwan, where de-icing chemicals are not used.