Electrical and Software Defects in Michigan Lemon Law Cases

Electrical and software defects affecting safety equipment, drive systems, or core functionality qualify under Michigan’s substantial-impairment test.

What counts as an electrical / software defect

Engine and transmission control software

Bad ECU/TCM software causes stalling, poor shifting, “limp mode” triggers. Each reflash counts as a repair attempt under § 257.1403.

Wiring harness failures

Corroded, chafed, or improperly routed harnesses. Michigan winters with road salt accelerate corrosion significantly.

Battery management system (BMS) failures

Premature 12V battery failures, “vehicle drained” no-start conditions. Cold-weather battery failures are particularly common in Michigan.

Safety-equipment software bugs

When software defects affect ABS, traction control, stability control — strong Magnuson-Moss federal-court exposure.

ADAS failures

Adaptive cruise, lane departure warning, automated parking, blind-spot monitoring.

Infotainment crossing into safety

When failures spill into safety equipment.

Cold-weather electrical issues

Michigan-specific patterns:

• Cold-soak failures (vehicle won’t start after sitting in -10°F for 8+ hours).
• Charging-port failures on EVs in cold/icy conditions.
• Wiring harness corrosion from road salt.
• Power-window/door-lock failures in deep cold.

Software reflashes as repair attempts

Each reflash counts. Four reflashes meets Michigan’s four-attempt threshold.

OTA updates

Tesla and others use OTA updates. Federal Magnuson-Moss case law trends toward “yes” when an OTA targets a specific defect.

TSBs and federal Magnuson-Moss strategy

When a TSB exists, Magnuson-Moss claims become particularly strong in federal court (E.D. or W.D. Mich.) — mandatory § 2310(d)(2) attorney fees on prevailing.

What you should do

1. Report defect within 1 year of delivery.
2. Document each repair attempt — dealer visits AND OTA updates.
3. Note specific trigger conditions (temperature, time of day).
4. Save dash-cam or smartphone video.
5. Send certified-mail notice.
6. Get a free case review.

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