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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