California diminished value claims: what the law says
In California you can claim diminished value from the at-fault driver when a repair can't fully restore your car's value. Your own collision coverage generally won't pay it. You have three years to sue.
Written by Todd Whittington, Editor·Last reviewed Verified 2026-10-18
The short answer
Claim from the at-fault driver's insurer
Yes. You can claim the lost value from the at-fault driver's insurer.
Claim from your own insurer
No. Your own policy doesn't pay diminished value when the car is properly repaired.
Deadline to sue
3 years from the crash to sue for damage to your car
If you were partly at fault
Your claim is cut by your share of the blame, but you can still recover something even if you were mostly at fault.
State insurance department guidance
We found no diminished value guidance on the state insurance regulator's site.
Claiming from the other driver's insurer
California's Supreme Court has approved repair cost plus the difference between the value before the damage and the value after repairs, when property can't be completely repaired. The case involved a machine, not a car, so the rule rests on how California values damaged personal property generally.
“the difference between the value before the injury and its value after the repairs have been made, plus the reasonable cost of making the repairs” — Merchant Shippers Assn. v. Kellogg Express & Draying Co. (1946) 28 Cal.2d 594, 600; see also Civ. Code §3333
Claiming from your own insurer
In Ray v. Farmers (1988), a California appeals court held that collision coverage that lets the insurer repair with parts of "like kind and quality" doesn't pay for lost market value after the repair. One judge disagreed.
“We will not rewrite an otherwise unambiguous limitation of collision coverage to provide for a risk not bargained for.” — Ray v. Farmers Ins. Exchange (1988) 200 Cal.App.3d 1411, 1416-1418
The deadline
You have three years to sue over injury to personal property, which includes your car.
“Within three years: ... (c) (1) An action for taking, detaining, or injuring goods or chattels” — Cal. Code Civ. Proc. §338(c)(1)
If you were partly at fault
Pure comparative fault. California uses pure comparative fault: your claim is cut by your share of the blame, but you can recover something even if you were mostly at fault.
“We have concluded that the "pure" form of comparative negligence is that which should be adopted in this state.” — Li v. Yellow Cab Co. (1975) 13 Cal.3d 804, 827-829
What this means when you're deciding
Not your fault? Ask the at-fault driver's insurer in writing. Show why the repair didn't restore the car's value: the accident history, listings, an appraisal if it's large.
Your own insurer usually won't pay diminished value under collision coverage.
Partly at fault? You can still claim; expect it to be cut by your share of the blame.
Deadline: three years to sue. Run your numbers through the diminished value calculator first. If the typical appraisal midpoint is under $500, it is rarely worth chasing.
Is a claim worth it on your car?
The calculator runs the insurer's formula on your car, shows what appraisals usually find, and tells you whether to skip it, ask yourself, or pay for an appraisal.
At-fault driver's insurer: Merchant Shippers Assn. v. Kellogg Express & Draying Co. (1946) 28 Cal.2d 594, 600; see also Civ. Code §3333. Source.
Your own insurer: Ray v. Farmers Ins. Exchange (1988) 200 Cal.App.3d 1411, 1416-1418. Source.
Deadline: Cal. Code Civ. Proc. §338(c)(1). Source.
Fault rule: Li v. Yellow Cab Co. (1975) 13 Cal.3d 804, 827-829. Source.
Insurance department guidance: none found. Site-restricted web searches on insurance.ca.gov for diminished value / diminution in value; downloaded the CDI auto consumer pages and guides and found no matches. The only hit was an insurer rate-filing approval list (July 2018) naming an AAIS 'Diminution of Value' endorsement form, which is not consumer guidance. Did not browse the CDI bulletins index page by page or search Title 10 CCR.
We read every cited source on October 18, 2026. We cite statutes and court decisions, not law-firm or appraiser summaries. Anything we could not check against a primary source is marked "Not verified".