1. What they do

Cummins Inc. (NYSE: CMI) designs, manufactures, and services diesel and alternative-fuel engines, power-generation systems, and (through its Accelera segment) hydrogen and battery-electric components. Headquartered in downtown Columbus, IN since 1919. Major Indiana facilities: Columbus Engine Plant (CEP), Columbus Mid-Range Engine Plant (CMEP), Seymour Engine Plant, and the Cummins Technical Center.

2. What customers actually report

• EPA defeat-device case: the December 2023 settlement covered roughly 630,000 Ram 2500/3500 trucks (2013–2019) found to contain software that caused emissions controls to underperform in real-world driving. DOJ characterized the violation as the largest Clean Air Act mobile-source penalty ever assessed.
• NHTSA recalls: Cummins-engineered components have been the subject of multiple NHTSA recalls over the past decade, including fuel-injection and EGR-related recalls in heavy-duty diesel applications. Recall execution rate (per NHTSA campaign data) is generally consistent with industry norms for parts-supplier recalls.
• B-Series engine reputation: Cummins’s 5.9L and 6.7L Inline-6 diesel engines (Ram heavy-duty) are independently rated among the longest-lived diesel engines in U.S. consumer market by publications including Truck Trend and Diesel Power Magazine.
• Glassdoor: Cummins overall employee rating is ~3.9–4.0 / 5 with strong scores on benefits and work-life balance.

3. What the data shows

• SEC 10-K (2024): $34.1B revenue, $3.94B net income.
• EEO-1 / sustainability report: Cummins publishes an annual sustainability report disclosing safety statistics, emissions, and workforce metrics.
• BBB profile (Columbus HQ): A+ rating; complaint volume is low relative to company footprint.
• DOJ press release 12-22-2023: $1.675B settlement — $1.675B in civil penalties under CAA Section 205, plus separate $325M Stellantis settlement.

4. How they handle complaints

Cummins runs a formal warranty-administration system through its dealer network and QuickServe Online portal. Out-of-warranty disputes typically route through dealer escalation, then to Cummins Customer Assistance. The CAA settlement included a binding compliance and recall program covering the affected Ram trucks — the consent decree is a public EPA document specifying the corrective action.

5. IBE Score: 6/10 — reasoning

Strong industrial fundamentals; well-regarded product line in heavy-duty diesel; offset by the largest Clean Air Act penalty in U.S. history. The $1.675B settlement is recent (Dec 2023) and the underlying conduct ran from 2013–2019, which prevents a higher score until a clean compliance window has accumulated. 6/10.

6. Verified public sources

1. DOJ press release — Cummins $1.675B Clean Air Act settlement (Dec 22, 2023)
2. EPA Cummins Clean Air Act settlement summary
3. Cummins 2024 Annual Report (10-K) — SEC EDGAR
4. NHTSA recalls database — Cummins component campaigns
5. BBB profile — Cummins Inc., Columbus IN

7. What this review is, and what it isn’t

• Independent. No payment, sponsorship, or advertising relationship between IBE and the reviewed business.
• Public-record only. Every claim above traces to a source listed in section 6. Where data couldn’t be verified, the review either omits the claim or labels it as a pattern reported by customers (not a finding).
• Not legal or medical advice. If a specific transaction went wrong, document it in writing, escalate to the company first, then to the relevant regulator (Indiana AG, IDOI, IURC, CFPB, FDA, NHTSA, etc.) as appropriate.
• Updated as evidence comes in. If you have a primary-source document that changes any claim above — a court filing, a regulatory order, a settlement agreement — submit it via the tip form. Reviews are revised when verifiable evidence warrants.

This review reflects publicly available information as of the review date listed above. IBE has no commercial relationship with Cummins Inc. or its parent entities.