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N.D. Cal.MixedFiled Aug. 19, 2025

Lien v. Mercedes-Benz USA, LLC

Judge
Charles Breyer
Docket
3:23-cv-01268
Court
U.S. District Court · Northern District of California
Pages
4
Summary JudgmentContractCivil Procedure
In one sentence

In Lien v. Mercedes-Benz USA, Judge Breyer granted summary judgment on three claims and remanded the remaining express-warranty claim to state court.

Who this affects

Phat T. Lien’s three claims were resolved against him by summary judgment, while his remaining express-warranty claim was sent to the Superior Court of California for the County of San Francisco; Mercedes-Benz USA, LLC prevailed on the three resolved claims.

What happened

In Lien v. Mercedes-Benz USA, LLC, Phat T. Lien sued Mercedes-Benz USA, LLC over a used Mercedes-Benz vehicle, asserting express-warranty, implied-warranty, good-faith-and-fair-dealing, and Magnuson-Moss Warranty Act claims. Lien did not oppose summary judgment on the implied-warranty, good-faith-and-fair-dealing, and Magnuson-Moss claims.

The court concluded that Mercedes-Benz had shown that the case initially entered federal court properly, but had not shown an independent basis for federal jurisdiction over the remaining express-warranty claim. That claim arose under California law, and the court determined that it was within the court’s supplemental jurisdiction instead.

Judge Charles R. Breyer granted Mercedes-Benz’s motion for summary judgment on the three unopposed claims, declined to continue exercising supplemental jurisdiction over the express-warranty claim, and remanded the action to the Superior Court of California for the County of San Francisco.

The detailed version

For law students, journalists, and other readers who want the full reasoning

Case
Lien v. Mercedes-Benz USA, LLC · No. 3:23-cv-01268
Judge
Charles Breyer
Date
Aug. 19, 2025

Background

Phat T. Lien sued Mercedes-Benz USA, LLC based on his purchase of a used Mercedes-Benz vehicle. His claims were for breach of express warranty, breach of implied warranty, breach of the implied covenant of good faith and fair dealing, and violations of the Magnuson-Moss Warranty Act.

Mercedes-Benz moved for summary judgment, which is a request to rule for the moving party because the evidence does not require a trial. Lien did not oppose the motion as to his implied-warranty, good-faith-and-fair-dealing, and Magnuson-Moss claims. The court therefore found that Lien had abandoned those claims and entered summary judgment for Mercedes-Benz on them.

Federal Jurisdiction

The court concluded that federal jurisdiction over Lien’s amended complaint was initially proper. Lien had asserted a facially viable claim under the federal Magnuson-Moss Warranty Act, supporting federal-question jurisdiction. The court also noted that the alleged vehicle value was $60,459.80 and that the attorney-fee request under the Magnuson-Moss Act could have brought the amount in controversy above the $75,000 threshold for diversity jurisdiction.

After the three claims were resolved, the express-warranty claim was the only remaining claim. That claim arose under California Commercial Code § 2313, so federal-question jurisdiction did not apply. The court also found that Mercedes-Benz had not shown that the amount in controversy for that claim exceeded the jurisdictional threshold. The court therefore determined that its jurisdiction over the express-warranty claim was supplemental jurisdiction, meaning jurisdiction over a state-law claim connected to claims within the court’s original jurisdiction.

Ruling

The court declined to continue exercising supplemental jurisdiction under 28 U.S.C. § 1367(c)(3). It explained that there had been no litigation on the merits of the express-warranty claim and that state courts were better equipped to resolve the remaining state-law issues. The court granted Mercedes-Benz’s motion for summary judgment as to Lien’s implied-warranty, good-faith-and-fair-dealing, and Magnuson-Moss claims, declined to exercise supplemental jurisdiction over the remaining express-warranty claim, and remanded the action to the Superior Court of California for the County of San Francisco.

The authoritative version

Read the full 4-page opinion on CourtListener, the free public archive maintained by the Free Law Project.

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