The pillar guide
How to dispute an auction arbitration offer (step by step)
You bought a vehicle at a wholesale auction, your shop found a problem the condition report didn't disclose, and the arbitration offer came back for a fraction of the repair. Here is what the process actually is, where dealers lose claims on a technicality, and how to respond.
What auction arbitration actually is
Arbitration, in the wholesale auction world, is not a courtroom process. It is a post-sale claims process the auction itself runs, under a policy it wrote and can amend. When a vehicle you bought has an undisclosed mechanical problem, structural issue, or a condition report that didn't match reality, you file a claim through that auction's own arbitration department, which reviews it against its own rules and decides what, if anything, it owes you.
That matters for one big reason: you are not arguing against a neutral third party applying a universal standard, you are arguing against the rulebook's author. The National Auto Auction Association (NAAA) publishes a set of arbitration guidelines many auctions reference, but NAAA is guidance, not a binding law that overrides anyone. Individual auctions adopt it, modify it, or set their own numbers entirely. One regional auction uses a $500 arbitration threshold, well below NAAA's commonly cited $800, while another restricts most claims to sale-day only. The auction's own current policy, dated and versioned, is what actually governs your claim.
The filing window trap
The single most common way a legitimate claim dies has nothing to do with the repair. It's the clock. Every auction sets a window to file, and the windows are measured differently from house to house, which is exactly what trips people up.
- From date of sale. ACV Auctions gives ten calendar days from the date your bid is accepted, with the purchase date counting as day one. If you used ACV's own transportation service, you get whichever is longer: the standard ten-day window, or four calendar days after delivery.
- From receipt or pickup, not from sale. Some auctions start the clock when the vehicle physically reaches you, not when you bought it. A vehicle sitting in transport for a week can quietly burn through most of the window before you ever turn the key.
- Whichever comes first, on multiple measures at once. A few auctions combine a day count with a mileage cap or an hours-from-delivery rule and apply whichever limit is hit first, so a short test drive can close the window even inside the stated day count.
The practical lesson: the day you take delivery, find the current arbitration policy for that specific auction and write the actual deadline on the file, before anything else happens. Don't assume it works the way the last auction you bought from worked.
Auctions revise their arbitration policies on their own schedule. ACV's current policy took effect June 1, 2026. Manheim's As-Is threshold changed on April 1, 2026. A policy PDF you read six months ago may already be a superseded version, with a different window or dollar threshold than the one that actually applies to your purchase date.
The first offer is an opening number, not a ceiling
When an arbitration offer comes back low, it is easy to read it as final. It usually isn't. Most auction arbitration policies give the auction broad discretion in how they resolve a claim: a cash payment at wholesale parts-and-labor rates, a credit, cancelling the sale outright, or some other resolution "in the discretion" of the auction. A first-pass offer is frequently built from an incomplete read of your paperwork or a lowball estimate of the repair scope. Pushing back with better documentation is a normal part of the process, not an escalation.
What it is not: a ceiling you're stuck under. If the policy caps any remedy at your purchase price, that's the real limit worth knowing so you don't overreach. Everything below that ceiling is negotiable if your paperwork supports it.
The documents that actually move an arbitration decision
An arbitration department reads paperwork, not stories. Four documents do almost all the work.
- Your bill of sale. It fixes the purchase price and the purchase date, which sets both the filing clock and, often, the cap on what you can recover. Get the date right before you argue anything else.
- A diagnostic from a franchise (manufacturer) dealer. A diagnosis from the brand's own dealership carries more weight than a generic shop's writeup, because it comes from the people the manufacturer trained on that exact platform. If the diagnosis says the failure requires a specific repair, such as a complete transmission unit rather than a component-level fix, that language matters more than any adjective you could add yourself.
- Their itemized estimate or offer breakdown. Read exactly what the auction priced, line by line. A common failure mode is an offer that prices a smaller repair than the one actually diagnosed, for example pricing a timing set when the franchise diagnosis calls for a full engine (longblock) replacement because internal contamination can't be ruled out without teardown. That gap between what was diagnosed and what was priced is often the entire argument.
- The original condition report. This is the seller's own representation of the vehicle at time of sale. Whatever it didn't disclose, and whatever it got wrong, is your evidence that the defect wasn't apparent to you at purchase.
Put these four side by side before you write a word. In most disputed claims worth pursuing, the offer prices less repair than the diagnosis actually requires.
How to respond in writing
A written rebuttal beats a phone call for one simple reason: arbitration departments decide on paperwork. A phone call is your word against a note in their system. A letter is evidence.
Structure the response around three things: cite the specific section of their current policy that governs your claim (not a generic rule, and not last year's version), lay out the gap between what was diagnosed and what was priced, and attach your documents. If the policy lists document precedence, meaning it tells you which document wins in a conflict, use that hierarchy in your favor rather than arguing against it. We cover the exact structure and a fill-in-the-blank template in the rebuttal letter guide.
When not to argue
Not every low offer is worth fighting, and knowing where the line sits saves you time on claims that were never going to move.
- Wearable items. NAAA's guidelines specifically exclude wear items from arbitration: tires, wipers, belts, brake pads and shoes, rotors, bulbs, filters, timing belts, shocks, struts, suspension components, and fluids. If your repair estimate is mostly wear items, most auctions will point straight to this exclusion, and they'll be right to.
- Labor hours that fall inside the published range. Auctions that publish a labor rate, and many do, generally also work from published labor-time guides for common jobs. If the hours billed sit inside the normal range for that repair, arguing the hour count is a low-value fight. Put the energy into the repair scope instead: whether the right job was priced at all, not how many hours it should take.
- Conditions inherent to the model. A defect typical of a particular make, model, or platform, rather than specific to your vehicle, generally isn't arbitrable.
Arguing these categories doesn't just fail, it burns credibility on the parts of the claim that would otherwise win.
Not sure which category your claim falls into? The free checker reads your documents against the actual arbitration policy that applies to your purchase, no signup, no card, and tells you what's arguable and what isn't before you write anything.
Check your offer freeFrequently asked questions
Do I have to accept the auction's first arbitration offer?
No. Most arbitration policies give the auction discretion over the remedy, which means a first offer reflects one reading of the claim, not a final number. You can respond in writing with better documentation, provided you're still inside the filing window.
How long do I have to file an arbitration claim?
It depends entirely on the auction and changes over time. Windows range from a couple of days to a couple of weeks, and some are measured from the sale date while others are measured from delivery or receipt. Check the specific auction's current, dated policy the day you take delivery, since a policy you remember from a previous purchase may already be out of date.
Does the NAAA policy override an individual auction's own rules?
Generally no. NAAA guidelines are widely referenced, but individual auctions publish their own policies, often with their own thresholds, windows, and exclusions, and those govern first. Some auction policies explicitly state a precedence order where their own terms of service and arbitration policy come before any NAAA reference.
Can I file an arbitration claim for a worn part like tires or brakes?
Generally no. Wear items are commonly excluded from arbitration by name, including tires, wipers, belts, brake components, rotors, bulbs, filters, and suspension parts, since these are expected to need replacement as a normal part of ownership rather than a hidden defect.
What's the strongest evidence for an arbitration dispute?
A diagnosis from a franchise (manufacturer) dealer that clearly states the repair scope, read alongside the auction's own itemized estimate. When the two disagree about what the repair actually requires, that gap is usually the whole argument.
Arbitration Desk is an informational and document-preparation tool, not a law firm. This guide is not legal advice, and reading it does not create an attorney-client relationship. You review and send everything yourself.