General Motors Iowa Lemon Law Cases

General Motors is heavily represented in the IA market. GM has no IA plant. Major GM models supplied from:

• GM Arlington Assembly Plant (Texas) — Chevy Tahoe, Suburban, GMC Yukon, Cadillac Escalade.
• GM Wentzville Assembly Plant (Missouri) — Chevy Colorado, GMC Canyon, Chevy Express, GMC Savana — see Missouri coverage.
• GM Spring Hill TN — Cadillac LYRIQ, XT5, XT6, GMC Acadia — see Tennessee coverage.
• GM Bowling Green KY — Corvette C8 / Z06 / E-Ray / ZR1 — see Kentucky coverage.

Common GM defect categories

8L90 / 8L45 8-speed automatic — “torque-converter shudder”

• Shudder, vibration during torque-converter lock-up.
• Most common between 35-65 mph during light-throttle cruise.
• Affected: Silverado 1500 (Arlington TX / Wentzville MO), Tahoe, Suburban, Yukon, Escalade, Sierra, CT6, CTS, CT5, Camaro.
• Class-action history.

L87 6.2L V8 — connecting rod failures (2021-2024)

• Catastrophic engine failure.
• Affected: Cadillac Escalade, Chevy Tahoe / Suburban, Silverado 1500, GMC Yukon / Sierra.
• NHTSA-supervised recall.

Duramax 6.6L diesel (heavy-duty)

• DEF system crystallization, regen issues.
• GVWR often exceeds 15,000 lbs (IA threshold) — Lemon Law may not apply.

GM Infotainment 3 (and InfoTainment 4)

• Touchscreen lag and freezes.
• CarPlay / Android Auto disconnects.
• OnStar integration failures.
• Backup-camera failures — FMVSS 111 (triggers § 322G.3 first-attempt safety rule).
• Super Cruise issues (premium trims).

Corvette (C8 — Bowling Green KY-built)

• See Kentucky GM coverage.

Cadillac LYRIQ (EV — Spring Hill TN-built)

• See Tennessee GM coverage.

Chevy Bolt / Bolt EUV (discontinued)

• Battery recall.

Hummer EV (GMC)

• Early-production issues.

Cadillac Escalade

• 8L90 shudder.
• L87 V8 failures.
• Air suspension.

Buick (Encore, Enclave, Envision)

• Transmission issues.

A/C in IA heat

• AC compressor failures.

Recall and TSB history

• 8L90 shudder TSBs and class action.
• L87 V8 recall (2021-2024 production).
• Chevy Bolt battery recall.

Procedural considerations

• BBB Auto Line is GM’s certified IDS for most divisions.
• Federal venue options: N.D./S.D. Iowa or W.D. Mo. / N.D. Tex. Fort Worth / M.D. Tenn. (Nashville) / W.D. Ky. (Bowling Green Corvette).

§ 714H exposure

GM cases have § 714H exposure for:

• 8L90 “fixed” representations — when shudder persists.
• L87 V8 reliability representations.
• Recall-effectiveness representations.
• Super Cruise feature claims.
• LYRIQ / Hummer EV range claims vs. actual (particularly IA winter).

Bottom line

GM cases in IA span the rural pickup market, suburban SUV market, and growing EV market. The 8L90 shudder and L87 V8 failures are flagship defect patterns. Cross-state federal venue options for home-state OEM cases (TX/MO/TN/KY).

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