General Motors Oklahoma Lemon Law Cases

General Motors is heavily represented in the OK market. GM Oklahoma City Assembly Plant closed in 2006 (was producing Chevy Tahoe / Suburban) — no current OK GM plant. Major GM models in OK are supplied from:

• GM Arlington Assembly Plant (Texas) — Chevy Tahoe, Suburban, GMC Yukon, Cadillac Escalade. See Texas coverage.
• 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 (Arlington TX), Suburban (Arlington TX), 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 10,000 lbs.

GM Infotainment 3 (and InfoTainment 4)

• Touchscreen lag and freezes.
• CarPlay / Android Auto disconnects.
• Backup-camera failures — FMVSS 111.
• 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 — large NHTSA-supervised recall.

Hummer EV (GMC)

• Early-production issues.

Cadillac Escalade

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

Buick (Encore, Enclave, Envision)

• Transmission issues.
• Infotainment.

A/C in OK heat

• AC compressor failures common in OK summer.

Recall and TSB history

• NHTSA recall search by VIN.
• GM service portal for TSBs.

Procedural considerations

• BBB Auto Line is GM’s certified IDS for most divisions.
• Federal venue options: N.D./E.D./W.D. Okla. or N.D. Tex. Fort Worth Division (for GM Arlington TX-built vehicles).

OCPA $10K-per-violation exposure

GM cases have OCPA exposure for:

• 8L90 “fixed” representations — when shudder persists after remediation.
• L87 V8 reliability representations — when catastrophic failures occur within warranty.
• Recall-effectiveness representations.
• Super Cruise feature claims vs. actual.
• LYRIQ / Hummer EV range claims vs. actual.

Bottom line

GM cases in OK span the rural pickup market (Silverado / Sierra 1500/HD), suburban SUV market (Tahoe / Suburban / Yukon / Escalade), and growing EV market. The 8L90 shudder and L87 V8 failures are flagship defect patterns. Strong OCPA deceptive-conduct potential (actual damages + mandatory fees) for documented pattern conduct.

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