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Washington · Article Updated May 24, 2026

General Motors (Chevrolet/GMC/Cadillac/Buick) Cases Under Washington Lemon Law

GM cases in Washington — Silverado, Sierra, Tahoe, Suburban, Equinox, Bolt, Hummer EV, and emerging Ultium EV patterns.

General Motors (Chevrolet, GMC, Cadillac, Buick) is well-represented in Washington — particularly full-size pickups, SUVs, Bolt, and emerging Ultium-platform EVs. GM cases are pursued under RCW 19.118 (Washington Lemon Law) and WCPA.

Common GM defect patterns

  • 8-speed transmission shudder — Silverado, Sierra, Camaro (well-documented TSB pattern).
  • L87 / LT4 V8 lifter failures.
  • Bolt EV battery recall pattern (LG-cell fires).
  • Hummer EV early-build issues.
  • GMC Sierra Denali Ultimate infotainment crashes.
  • Cadillac Lyriq Ultium drive unit issues.
  • 6.6L Duramax diesel emissions failures.
  • Suburban / Yukon air suspension failures.
  • Cadillac CT5 Blackwing transmission issues.
  • Equinox / Terrain 1.5L turbo issues.

GM TSB / recall overlay

Heavy TSB pattern:

  • 8-speed shudder TSBs (multiple model years).
  • L87 lifter TSBs.
  • Bolt EV battery replacement recalls.
  • Duramax emissions service campaigns.
  • Air suspension TSBs.

Check NHTSA for your VIN.

Heavy-duty pickup considerations

Washington’s 19,000-lb GVWR Lemon Law threshold covers most Silverado 2500 / 3500 configurations.

WCPA Hangman Ridge fit

GM cases support WCPA Hangman Ridge public-interest impact particularly with:

  • Bolt EV battery class-action history.
  • 8-speed shudder multi-state class actions.
  • Duramax emissions pattern.

Bottom line

GM cases — particularly 8-speed shudder, Bolt EV battery, and Duramax emissions cases — are well-positioned for Washington Lemon Law and WCPA. The 19,000-lb GVWR threshold expands the heavy-pickup consumer base.

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