There is a kind of loss a manufacturer can cause that nobody gets hurt by and nothing gets broken by — and that is exactly why it slips through the coverage most shops assume protects them. A part comes back out of spec and cannot be used. A product does not do what the contract said it would. No one is injured, no other property is damaged, but the customer is out real money. That pure financial loss has a name and a home, and the home is not general liability. This post explains the gap and the line that fills it.
The short version: general liability is built around physical harm, and it is written to leave pure financial loss out. So when a product underperforms but hurts no one, the customer’s financial loss falls into a gap — and manufacturers errors and omissions is the professional-liability line built to fill it. The harm side, by contrast, lives in your general liability and products liability policy. Getting that boundary right is the difference between a covered claim and a surprise.
The loss nobody gets hurt by
Start with the loss itself, because it is the part owners overlook. Most people picture a defective product as something that injures someone or breaks something — the harm. But a product can be perfectly safe and still be a serious problem if it does not perform. A part machined to the wrong tolerance is not dangerous; it is just unusable. A product that does not deliver the function it was sold to meet hurts no one; it just leaves the customer carrying a financial loss — a missed deadline, lost revenue, a contract penalty, the cost of starting over.
That is pure financial loss: a third-party loss that is entirely financial, flowing from a product that failed to perform as specified, with no bodily injury and no property damage attached. It is real, it is common for any manufacturer whose product is bought on a specification, and it is precisely the loss general liability is not written to answer.
Why general liability does not respond
The reason is a deliberate gap in the standard general liability form, and it is worth naming precisely. General liability is written to respond to bodily injury and property damage — physical harm. It is also written to exclude the situation where a product causes neither. The standard form’s exclusions around “impaired property” and around property that has not been physically injured are drafted directly at the underperforming-product scenario: a product that is defective or does not meet a specification, that can be restored to use by repair or replacement, and that has caused no physical damage to anything.
Those exclusions mean general liability generally will not respond to pure financial loss with no physical harm. This is not an oversight or a coverage failure — it is the form working as designed. General liability answers the harm; it is specifically not written to answer the financial consequence of a product that simply underperforms. The exposure is left without a home on the general liability policy, and that is the precise gap the next line fills.
A worked example: a part machined out of spec
The cleanest way to see the line is a single example. Say you machine a part to a customer’s print, and it comes back out of spec — the tolerance is wrong, and the part is unusable in their assembly. Nobody is injured. No other property is damaged. But your customer cannot ship, misses a production deadline, and sues you for the lost revenue and the cost of the delay.
Walk it through the policies. Is there bodily injury? No. Is there property damage to something other than your own part? No. So general liability, built around physical harm, does not respond. The loss is entirely financial, and it flows directly from the product failing to perform as specified — which is the textbook trigger for manufacturers errors and omissions. What matters is the type of loss, and the fact that it lands in this line and not in general liability.
Claims-made coverage and the retroactive date
One mechanic of this line deserves its own attention, because it is where coverage is most often lost by accident. Manufacturers errors and omissions is often — though not always — written on a claims-made basis. A claims-made policy responds based on when the claim is reported, not when the underlying error occurred, and it depends on two things: keeping coverage continuous, and the retroactive date — the date back to which the policy will look for covered errors.
That is different from an occurrence policy, which responds to events that happened during the policy period regardless of when the claim is finally made. The practical consequence is real: with a claims-made policy, letting the coverage lapse or losing the retroactive date can leave an otherwise valid claim unanswered. Reading whether your errors-and-omissions line is claims-made, and protecting the retroactive date through renewals, is the kind of detail that is invisible until a claim makes it matter.
The third lane, beside harm and recall
Manufacturers errors and omissions is one of three lanes that cluster around a defective product. The other two are products liability, which answers the harm a defective product causes, and product recall, which answers the first-party cost of pulling the product back. The full distinction, with all three side by side, is in our hub post, three products coverages distinguished; and the harm-versus-cost line specifically is drawn in product recall versus product liability. The clean sentence to keep: products liability answers the harm, product recall answers the recall cost, and manufacturers errors and omissions answers the financial loss.
Why it matters for your operation
If your customers buy on the promise that a part or product will perform to a print, a tolerance, or a standard, then underperformance is a real exposure — and general liability will not answer it. We read your general liability’s impaired-property exclusion so no one assumes that policy stretches to cover a financial loss, check whether the errors-and-omissions line is claims-made, and protect the retroactive date through renewals. When you are ready, start a quote and tell us how tightly your product is held to a specification, or read the manufacturers errors and omissions and general liability and products liability pages to see how the lines fit together. Forms and editions vary by carrier, so the right move is always to confirm what your policy actually carries rather than assume.