Lien v. Mercedes-Benz USA, LLC
- Charles Breyer
- 3:23-cv-01268
- U.S. District Court · Northern District of California
- 4
In Lien v. Mercedes-Benz USA, Judge Breyer granted summary judgment on three claims and remanded the remaining express-warranty claim to state court.
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
- Lien v. Mercedes-Benz USA, LLC · No. 3:23-cv-01268
- Charles Breyer
- 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.
Read the full 4-page opinion on CourtListener, the free public archive maintained by the Free Law Project.