The right contact for the right request.
Official support first. Publicly listed corporate contacts when escalation is appropriate. Outside resources when you need another route.
Cadillac Customer Assistance
Open or update a case. Ask for your case number, assigned representative and manager escalation route.
Monday–Saturday, 8 a.m.–9 p.m. Eastern. Relay: 711.
Source: Cadillac · official ↗Reviewed Oct. 8, 2026
Cadillac callback request
Use the manufacturer’s request form. Keep the confirmation and link it to your existing case.
Read the current response estimate on the form.
Source: Cadillac · official ↗Reviewed Oct. 8, 2026
Cadillac written concerns
Cadillac Customer Assistance Center, Detroit, MI 48232-5169.
General support correspondence. Verify a separate statutory notice address if required.
Source: Cadillac · official ↗Reviewed Oct. 8, 2026
General Motors correspondence
General Motors Company, Detroit, MI 48232-5170. Include your existing brand case reference.
General correspondence does not automatically satisfy legal notice requirements.
Source: General Motors · official ↗Reviewed Oct. 8, 2026
Cadillac roadside assistance
For disabled vehicles and roadside assistance. Explain the location and immediate safety conditions.
Available 24/7. Coverage depends on applicable terms.
Source: Cadillac · official ↗Reviewed Oct. 8, 2026
Cadillac EV assistance
EV-specific roadside assistance. For an immediate emergency, call 911.
Available 24/7. Do not attempt high-voltage repairs.
Source: Cadillac · official ↗Reviewed Oct. 8, 2026
Chevrolet Customer Assistance
Official support route for Chevrolet owners.
Monday–Saturday, 8 a.m.–9 p.m. Eastern.
Source: Chevrolet · official ↗Reviewed Oct. 8, 2026
Buick Customer Assistance
Official support route for Buick owners.
Monday–Saturday, 8 a.m.–9 p.m. Eastern.
Source: Buick · official ↗Reviewed Oct. 8, 2026
GMC Customer Assistance
Official support route for GMC owners.
Monday–Saturday, 8 a.m.–9 p.m. Eastern.
Source: GMC · official ↗Reviewed Oct. 8, 2026
BBB AUTO LINE
Free dispute resolution for eligible claims. Use the AUTO LINE portal, not a general BBB business complaint.
Participation does not guarantee eligibility or a buyback.
Source: BBB National Programs · official ↗Reviewed Oct. 8, 2026
NHTSA safety complaint
Report possible safety defects and save your complaint number.
NHTSA oversees safety defects; it does not decide individual refunds.
Source: NHTSA · federal agency ↗Reviewed Oct. 8, 2026
NHTSA recall & bulletin research
Check VIN open recalls and year/make/model manufacturer communications, investigations and complaints.
A technical service bulletin is not automatically a recall.
Source: NHTSA · federal agency ↗Reviewed Oct. 8, 2026
David Marsh
Listed by Elliott as Global VP, Customer Care and Aftersales; role corroborated by a May 2025 GM byline.
Third-party directory last verified Oct. 19, 2025. Current delivery and title unconfirmed. Not an assigned Executive Resolution staff contact.
Source: Elliott Advocacy · third-party ↗ · Role source ↗Reviewed Oct. 8, 2026 · Delivery untested
Lin-Hua Wu
GM official biography: Executive VP and Chief Marketing and Communications Officer. Business email published by Elliott.
Third-party directory last verified Oct. 19, 2025. Delivery and case routing untested. Not an assigned case-team contact.
Source: Elliott Advocacy · third-party ↗ · Role source ↗Reviewed Oct. 8, 2026 · Delivery untested
Mary T. Barra
GM Chair and CEO. Business email published by Elliott Advocacy.
Third-party directory last verified Oct. 19, 2025. Delivery and case routing untested. An email does not guarantee personal review.
Source: Elliott Advocacy · third-party ↗ · Role source ↗Reviewed Oct. 8, 2026 · Delivery untested
Mark Reuss
GM President. Business email published by Elliott Advocacy.
Third-party directory last verified Oct. 19, 2025. Delivery and case routing untested. Not an assigned case-team contact.
Source: Elliott Advocacy · third-party ↗ · Role source ↗Reviewed Oct. 8, 2026 · Delivery untested
Sources and scope · Reviewed October 8, 2026. Practical scripts and sequencing are editorial suggestions, not GM policy.
Cadillac: contact customer assistance ↗GM: general correspondence ↗GM executive business contact directory ↗GM corporate leadership ↗See source notes and limitations →