GMC Lemon Law Attorneys in Illinois
GMC's Professional Grade positioning — Sierra Denali Ultimate, Yukon Denali, AT4X off-road trims, the Sierra HD Duramax fleet line, the redesigned 2024 Acadia, and the Hummer EV pickup — carries a higher MSRP and a more complex feature stack than its Chevrolet siblings (Super Cruise, MultiPro Tailgate, Adaptive Air Ride, CarbonPro bed, ProGrade Trailering). When those premium systems fail repeatedly inside 12,000 miles or 12 months at an Illinois GMC dealer, refund or replacement under 815 ILCS 380 (the New Vehicle Buyer Protection Act) and the federal Magnuson-Moss Warranty Act follows the same procedural path as any GM filing, but the higher-value defect classes change the case math.
An Illinois GMC qualifies under 815 ILCS 380 when a Denali, AT4, Sierra HD, Yukon, Acadia, Terrain, or Hummer EV / Sierra EV exhibits the same recurring nonconformity — MultiPro Tailgate motor failure, Super Cruise hands-free disengagement, Duramax LZ0 / Allison 10L1000 cluster, Adaptive Air Ride compressor fault, Ultium HV battery alert, or AFM/DFM lifter collapse on the 5.3L L84 or 6.2L L87 — that the GMC dealer cannot fix in four attempts or that keeps the vehicle out of service for 30 business days, all inside the statutory 12-month / 12,000-mile window. The procedural route is fixed for any GM vehicle in Illinois: 815 ILCS 380/3 written notice to GM's Detroit Customer Assistance Center, BBB AutoLine resort under 815 ILCS 380/4, then a Circuit Court filing under 815 ILCS 380/5 in Cook, DuPage, Lake, Will, Kane, Winnebago, McHenry, Sangamon, McLean, or Champaign County, all before the 18-month delivery clock under 815 ILCS 380/7 runs out. Magnuson-Moss (15 U.S.C. §2310(d)(2)) layers the federal fee-shift on top.
Why a GMC Filing in Illinois Plays Out Differently Than a Chevrolet Filing
GMC sits one notch above Chevrolet inside the General Motors stack: identical platforms underneath (GMT T1 trucks, Lambda/C1 crossovers, BT1 EV skateboard) but a distinct dealer network, a Professional Grade brand promise, premium-trim option content (Denali Ultimate, AT4X, Sierra EV Denali Edition 1), and a customer profile skewed toward fleet, contractor, and rural-Illinois agricultural use. That option content is what makes Illinois GMC filings different from Illinois Chevrolet filings: a 815 ILCS 380 "substantial impairment of market value" finding on a $98,000 Sierra Denali Ultimate with CarbonPro bed and Super Cruise carries different dollar stakes than the same finding on a base-trim Silverado. The 12-month / 12,000-mile presumption window under 815 ILCS 380/3(d) and the four-attempt / 30-business-day triggers are identical, but the failure modes that trigger them on a GMC are not.
The statute itself was passed in 1983 and runs through Chapter 815 of the Illinois Compiled Statutes, with the Illinois Attorney General's Consumer Protection Division certifying the manufacturer's informal dispute settlement procedure under 815 ILCS 380/4. For General Motors that procedure is BBB AutoLine, which is the mandatory first stop before an Illinois Circuit Court complaint becomes available. Illinois GMC owners working a claim have two roads inside the 18-month 815 ILCS 380/7 window: pursue the state remedy through BBB AutoLine and a county Circuit Court filing (see the full Illinois statute walkthrough), or build a broader GMC-specific Magnuson-Moss case off the federal warranty fee-shift. We typically run both counts in parallel so neither clock expires unused.
GMC Models Illinois Owners File On Most
Sierra 1500 Denali / Denali Ultimate / AT4X
The high-trim Sierra 1500 is GMC's most filing-heavy nameplate in Illinois and the defect mix is option-content driven, not platform-content driven. The MultiPro six-way tailgate (GMC-exclusive on the Sierra line) has a documented actuator-motor and latch-position-sensor cluster in the 2021–2024 GMT T1 generation that fails repeatedly in sub-20°F Chicago and Rockford ambient temperatures — the failure mode is the tailgate refusing to drop or the inner Gate function refusing to deploy after a cold-soak. Super Cruise hands-free driving on the Denali Ultimate routinely disengages on I-355, I-294, and the Kennedy/Eisenhower reversible lanes where IDOT lane-stripe paint is worn to specification but below Super Cruise's LiDAR-map confidence threshold. The CarbonPro carbon-fiber composite bed on Denali Ultimate has documented clear-coat delamination and stress-crack issues on bed rails. The 6.2L L87 engine cluster (NHTSA recall 25V-274, ~597,000 vehicles covered) overlaps with the Silverado but Sierra Denali Ultimate carries a higher 815 ILCS 380/3 refund-formula because the MSRP basis runs $85K–$100K. Each of these is a free-standing four-attempt or 30-business-day path under 815 ILCS 380/3(d).
Defect classes: MultiPro Tailgate, Super Cruise disengagement, CarbonPro delamination, 6.2L L87 engine damageSierra HD 2500 / 3500 (Duramax LZ0)
The Sierra HD is GMC's heavy-duty body-on-frame pickup and the dominant filing pattern in central and downstate Illinois — the McLean / Champaign / Peoria / Sangamon corridor where agricultural fleets, construction contractors, and DOT subcontractors run Sierra 2500HD and 3500HD on the 6.6L LZ0 Duramax diesel paired with the Allison 10-speed 10L1000 transmission. Three filing clusters dominate: (1) DEF heater / NOx sensor failures that go to "limp-home" derate mode in sub-zero rural operations because the diesel exhaust fluid line freezes outside the heated zone — documented in GM TSBs but persistent across 2021–2024 model years; (2) Allison 10L1000 hard-shift and slip-bind events under gooseneck or fifth-wheel load on grades where the transmission cannot decide between locked-converter ranges; (3) ProGrade Trailering 15-camera system (the GMC-exclusive overhead-view trailer-camera array) producing repeated "trailer camera lost connection" faults on cold ambient with road-salt corrosion at the seven-pin trailer-light connector. All three trip 815 ILCS 380/3(d) four-attempt or 30-business-day patterns inside the 12,000-mile presumption window, which closes faster on an HD truck on fleet duty.
Defect classes: Duramax DEF system, Allison 10L1000, ProGrade Trailering cameras, rural-duty wearYukon Denali / Denali Ultimate / AT4
The 2021–2024 Yukon Denali generation introduced an independent rear suspension with Air Ride Adaptive Suspension (GMC-exclusive at this trim level — Chevrolet Tahoe High Country uses Magnetic Ride but not the height-adjustable air system). The air-spring compressor and ride-height sensor cluster produces a Chicago-metro-specific failure mode: the compressor cycles continuously to maintain ride height after the air bags lose pressure through cold-shrunk seals, the duty cycle exceeds the compressor's thermal envelope, and the system kicks into "Service Suspension" derate. North Shore (Lake Forest, Highland Park, Glencoe) and DuPage (Naperville, Hinsdale, Oak Brook) Yukon Denali owners file most of these. The 5.3L L84 DFM cylinder-deactivation lifter-collapse pattern carries over from the Silverado/Tahoe and triggers in the December–February cold-start cluster. The 12.6-inch driver display + Google built-in HMI on 2024+ Denali Ultimate has produced reboot-loop and CarPlay handoff failures that count toward the four-attempt presumption when treated as a single nonconformity under 815 ILCS 380/3(d)(2). Yukon Denali MSRP basis runs $80K–$110K, which materially changes the refund math.
Defect classes: Air Ride compressor, AFM/DFM lifter, infotainment reboot loop, 10L80 cold shudderAcadia (2024+ third-gen redesign) / Terrain AT4 / Denali
The 2024+ Acadia is a ground-up redesign — new C2XX-EVO chassis, new 2.5L turbo-four (LK0) replacing the 2.0L LSY, new sheetmetal, larger overall footprint. First-year production runs carry the highest defect-rate risk in any GMC nameplate and the IL repair-order data is showing it: the LK0 turbo has documented oil-consumption complaints in cold-start duty, the 9T65 nine-speed has carry-over shudder patterns from the prior-generation Acadia, and the 11-inch infotainment stack has Google-built-in connectivity faults during the cold-start crank cycle when the modem boots before the head-unit completes its boot sequence. Terrain claims on 2021–2024 vehicles run on the 1.5L LYX turbo timing-chain-stretch and oil-consumption cluster, but the GMC-specific angle is the AT4 / Denali trim packaging: AT4-trim suspension differences and Denali-trim leather/HMI options change the substantial-impairment-of-market-value calculus under 815 ILCS 380/3(d)(1). All claims live inside the same 12,000-mile / 12-month statutory window.
Defect classes: 2.5L LK0 first-year defects, 9T65 transmission, infotainment boot order, trim-specific MV impairmentHummer EV Pickup / Hummer EV SUV / Sierra EV Denali Edition 1
GMC owns the BT1 EV platform's premium end at General Motors. The Hummer EV Pickup (2022–), Hummer EV SUV (2024–), and Sierra EV Denali Edition 1 (launched late 2023 as the highest-MSRP Sierra EV trim, $100K+) all carry GMC-exclusive features that drive their own filing classes: CrabWalk (the diagonal-motion mode using the four-wheel steering system) producing servo-motor and alignment-calibration faults; 4-Wheel Steer producing "Service 4WS" alerts at low-temperature operation; Extract Mode air-suspension lift faults; and the 24-module Ultium pack — the largest production EV battery sold — on the Hummer EV producing HV battery service alerts at a rate the IL data suggests is materially higher than the Silverado EV equivalent because of the pack size and 9,640-lb curb-weight thermal load. NHTSA recall 23V-085 remains active. The cold-weather degradation pattern is the same Midwest worst-case as the Silverado EV (NMC chemistry loses 20–40% usable capacity below freezing) but the GMC-exclusive feature failures (CrabWalk, 4WS, Extract Mode) sit outside any published recall remedy. Cook County and DuPage Circuit Courts have accepted these as 815 ILCS 380/3(d) substantial-impairment claims.
Defect classes: CrabWalk servo, 4-Wheel Steer, Ultium HV alerts, Extract Mode air suspensionThe Five GMC-Specific Defect Classes That Drive Illinois Filings
Illinois GMC owners file on a different defect mix than Illinois Chevrolet owners because GMC's option content is different: MultiPro Tailgate, CarbonPro bed, Super Cruise hands-free, Adaptive Air Ride, ProGrade Trailering, CrabWalk, and the Sierra HD Duramax-Allison HD powertrain are GMC-exclusive at these trim levels and produce their own failure signatures. Five patterns disproportionately drive Illinois GMC repair orders:
- MultiPro Tailgate cold-weather actuator and latch-sensor failures on Sierra 1500/HD. The six-function MultiPro tailgate is a GMC-exclusive (Chevrolet's Silverado uses the conventional multi-flex tailgate). The actuator motors and latch-position sensors fail at a measurably higher rate in sub-20°F ambient temperatures: the tailgate refuses to drop, the inner Gate function will not deploy, or the load-stop function fails. Repeat dealer visits for the same MultiPro fault are a clean four-attempt path under 815 ILCS 380/3(d)(2), and Illinois Circuit Courts treat a non-functioning tailgate on a $90K Sierra Denali Ultimate as a substantial impairment of use.
- Super Cruise hands-free disengagement on Denali Ultimate, Yukon Denali Ultimate, Sierra EV. Super Cruise's LiDAR-mapped lane-keeping disengages when IDOT lane-stripe paint falls below detection-confidence threshold — common on I-355, the Kennedy Reversible Lanes, the Eisenhower (I-290), and the salt-brine-residue overlay common on Cook and Lake County expressways from November through April. Repeat "Super Cruise unavailable" or premature disengagement events have been accepted as substantial impairment of market value on a feature the consumer specifically paid for at point of sale.
- Duramax LZ0 DEF heater and Allison 10L1000 hard-shift cluster on Sierra HD. Central and downstate Illinois Sierra HD owners on agricultural or contractor duty (Bloomington, Champaign, Peoria, Springfield) see DEF-line freeze-and-derate events at sustained sub-zero ambient, and Allison 10L1000 hard-shift / slip-bind events on gooseneck loads or grade descents. Both classes produce four-attempt patterns inside the 12-month / 12,000-mile window — which closes fast on a Sierra HD on fleet duty.
- Adaptive Air Ride compressor failures on Yukon Denali / Sierra Denali Ultimate. GMC's height-adjustable air suspension (a Denali-trim option not shared with Chevrolet Tahoe High Country) has a Chicago-metro-specific failure mode: cold-shrunk air-bag seals lose pressure overnight, the compressor cycles continuously to refill them, the duty-cycle exceeds the compressor's thermal envelope, and the system kicks into "Service Suspension" derate. North Shore and DuPage filings cluster here.
- CrabWalk / 4-Wheel Steer / Extract Mode faults on Hummer EV. GMC's Hummer EV CrabWalk (diagonal motion) and 4-Wheel Steer are GMC-exclusive features and not present on any Chevrolet vehicle. "Service 4WS," CrabWalk alignment-calibration faults, and Extract Mode air-suspension lift failures sit outside any published recall remedy (recall 23V-085 covers the battery pack only), and Cook and DuPage Circuit Courts have accepted these as standalone 815 ILCS 380/3(d) substantial-impairment claims on Hummer EV owners' four-attempt records.
The 815 ILCS 380/3 Notice Goes to GM Detroit, Not Your GMC Dealer
GMC dealers in Illinois are franchised retailers, not manufacturer agents for 815 ILCS 380 pre-suit purposes. The statute is explicit: the final-cure notice must go to General Motors LLC itself, in writing, identifying the same nonconformity and the prior repair attempts, and giving GM a chance to cure. GM consolidates warranty correspondence for every brand on its roster — GMC, Chevrolet, Buick, Cadillac, and the legacy Pontiac / Oldsmobile / Hummer (H1/H2/H3 era) lines — through a single Customer Assistance Center mailbox. That mailbox is the operative address for the IL statutory pre-suit notice:
General Motors — Manufacturer Notice Address
General Motors LLCAttn: Customer Assistance Center
P.O. Box 33170
Detroit, MI 48232-5170
Three GMC-Specific Case Patterns IL Circuit Courts See Most
Every 815 ILCS 380 claim against GM has to clear two gates: the 815 ILCS 380/4 BBB AutoLine resort (the IL Attorney General Consumer Protection Division-certified informal dispute settlement procedure for General Motors), and either a settled remedy at BBB AutoLine or a Circuit Court complaint under 815 ILCS 380/5. GMC-specific cases sort into three recurring fact patterns based on which GMC option-content feature is failing, what county the consumer drives in, and how the dealer repair ledger reads:
Pattern A — The Sierra HD Duramax case. Central-IL contractor, farmer, or small fleet operator on a 2021–2024 Sierra 2500HD or 3500HD with the 6.6L LZ0 Duramax + Allison 10L1000. The dealer ledger shows three or four visits for the same DEF-system, EGR, or transmission slip-bind complaint and a stretch of 20–40 business days during which the truck sat at the dealer waiting on DEF heater parts, NOx sensors, or Allison rebuild kits on national backorder. The case clears both 815 ILCS 380/3(d) triggers (four-attempt AND 30-business-day), which is the strongest factual posture available. Refund formula under 815 ILCS 380/3(a) on a $75K–$95K Sierra HD is materially larger than the equivalent Silverado HD case because of the Denali / AT4 trim premium.
Pattern B — The Yukon Denali Adaptive Air Ride / Super Cruise case. North Shore (Lake Forest, Highland Park, Wilmette) or DuPage (Naperville, Hinsdale, Oak Brook) family on a 2021+ Yukon Denali or Denali Ultimate. The repair ledger shows multiple "Service Suspension" events for the Adaptive Air Ride compressor and overlapping Super Cruise disengagement reports. Two distinct nonconformities, each tracked separately, each capable of triggering the four-attempt presumption inside the 12,000-mile window. This pattern carries the highest dollar-value 815 ILCS 380/3 refund formula in any Illinois GMC case because of the Denali Ultimate MSRP ceiling.
Pattern C — The Hummer EV / Sierra EV Denali Edition 1 propulsion-fault case. Chicago metro or DuPage early-adopter on a 2022–2024 Hummer EV Pickup, Hummer EV SUV, or 2023–2024 Sierra EV Denali Edition 1. The dealer ledger documents repeated HV battery service alerts, CrabWalk or 4WS faults, Extract Mode air-suspension lift errors, or propulsion-power-reduced events that recur after software updates and outside the NHTSA recall 23V-085 remedy scope. BBB AutoLine's standard "software update" remedy does not cure the underlying fault, the case proceeds to a Cook or DuPage Circuit Court complaint under 815 ILCS 380/5, and the federal Magnuson-Moss count under 15 U.S.C. §2310(d)(2) carries the attorney-fee shift because 815 ILCS 380 itself does not contain a mandatory state fee-shift. We plead both counts in every Illinois GMC case for exactly this reason.
Building a Complete GMC Service-Record Set for BBB AutoLine and IL Circuit Court
A 815 ILCS 380 case wins or loses on the repair-order package. BBB AutoLine arbitrators and Illinois Circuit Court judges read for four things on every invoice: date and odometer at check-in, the verbatim customer-complaint statement, the technician's diagnosis and parts-replaced line items, and the next-action / next-visit note. "No trouble found" or summary-only invoices without technician narrative will not carry a four-attempt or 30-business-day finding. Here is the assembly order that consistently produces an Illinois-court-ready record set on a GMC:
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Start with my.gmc.com Owner Center as your baseline ledger
Sign in to my.gmc.com using the same account tied to your VIN registration and export the full Vehicle Service History. GMC Owner Center (separate from my.chevrolet.com or my.buick.com despite shared backend) gives you GM-network dealer visits but typically misses independent body shops, mobile-service appointments handled outside the dealer DMS, and any visit billed to a fleet account rather than a retail account. The Owner Center export is your starting map — not the complete record set.
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Send each Illinois GMC dealer a written records request
Address the request to the dealership's service manager and copy the dealer principal. Reference the Illinois Consumer Fraud and Deceptive Business Practices Act (815 ILCS 505) and the dealer's own warranty-administration obligations under the GM Service Policies and Procedures Manual. Ask specifically for the full multi-page technician story (the GMSi diagnostic narrative behind the customer-facing invoice), parts ledger, labor-time guide entries, and any escalation notes to GM TAC (Technical Assistance Center). Summary invoices alone will not support a four-attempt finding.
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Build a contemporaneous shadow log for "could not duplicate" visits
Many GMC defect patterns — MultiPro Tailgate cold-actuation failures, Super Cruise paint-confidence disengagement, Adaptive Air Ride overnight settle, Hummer EV CrabWalk calibration faults — do not reproduce at dealer ambient temperature on a service-bay lift in a 65°F shop. A "no trouble found" ticket is not the end of the road. Write a date-stamped note immediately after the visit capturing the service advisor's name, the exact words used, and any video or photo evidence of the failure mode you brought in. IL Circuit Courts have repeatedly accepted these shadow-log entries as evidence of a nonconformity that exists notwithstanding a clean RO.
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Resist the "repair orders are GM-confidential" pushback
Some IL GMC dealers will tell you the RO content belongs to GM and they need GM's authorization to release it. That is not the legal position under Illinois retail contract law: you paid for or warranted the work and the invoice for that work is yours. If the service manager refuses, request the dealer principal and reference 815 ILCS 505. Document every refusal in writing — persistent refusal to release ROs becomes its own evidence point at BBB AutoLine.
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Pull the loaner-vehicle ledger for the 30-business-day path
For a 815 ILCS 380/3(d)(1) 30-business-day-cumulative case, the dealer's loaner-vehicle contract file and any third-party rental receipts are the authoritative proof of out-of-service days. Request copies of every loaner pickup and return slip. Illinois counts business days — Monday through Friday, holidays excluded — not calendar days. Twenty-eight calendar days at a Chicago dealer over a holiday-heavy December often clears 30 business days when counted correctly because of the holiday-and-weekend stripping.
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Assemble the chronology against both 815 ILCS 380 clocks
Two clocks govern the filing window: the 815 ILCS 380/3 statutory warranty period (12 months OR 12,000 miles from delivery, whichever comes first), and the 815 ILCS 380/7 statute of limitations (18 months from delivery to file the civil action). The chronology has to demonstrate the qualifying nonconformity arose inside the first clock and the filing occurred inside the second. On a Sierra HD doing fleet duty or a Yukon Denali doing daily school-run miles, both clocks can compress unexpectedly fast.
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Illinois Lemon Law — Full Statute & IL Circuit Court Process
The complete 815 ILCS 380 breakdown, BBB AutoLine pre-suit step under 815 ILCS 380/4, 12-month / 12,000-mile statutory window, 18-month statute of limitations under 815 ILCS 380/7, and Illinois-wide attorney coverage from Chicago to Springfield.
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GMC-specific defect patterns across all 49 states we cover (CA excluded), Magnuson-Moss strategy, GM warranty playbook, and nationwide attorney representation.
Go to GMC hub →GMC × Illinois Lemon Law FAQ
Is my Sierra Denali Ultimate's CarbonPro bed delamination a covered nonconformity?
If the delamination materially affects the vehicle's use, value, or safety and the GMC dealer cannot fix it after four attempts (or the truck sits out of service 30 business days) inside the 12-month / 12,000-mile window, yes — 815 ILCS 380/3(d) does not enumerate covered defects, it covers any "nonconformity which substantially impairs" the vehicle. A failed CarbonPro composite bed on a $98,000 Sierra Denali Ultimate clearly impairs market value because the bed is a paid-for premium option visible on the window sticker and the dealer-network replacement cost is significant. We pair the CarbonPro count with the substantial-impairment-of-market-value framing under 815 ILCS 380/3(d)(1).
Super Cruise on my Yukon Denali Ultimate keeps disengaging on the Kennedy — is that a 815 ILCS 380 issue?
Repeat unintended disengagement of an advertised hands-free driving feature the consumer paid extra for at point of sale is treatable as a 815 ILCS 380 nonconformity in Illinois. Super Cruise is a paid Denali Ultimate option (or a $25/month subscription on certain trims), it is marketed on the window sticker and at the dealership as a defining feature, and the LiDAR-map and lane-paint confidence-failure mode is reproducible. Four documented "Super Cruise unavailable" or premature-disengagement repair orders on the same nonconformity inside the 12-month / 12,000-mile window meet 815 ILCS 380/3(d)(2). We typically run the Super Cruise count alongside other open issues so the four-attempt math works on the strongest single nonconformity rather than the aggregate.
I run a Sierra HD as a work truck. Does fleet titling block my 815 ILCS 380 claim?
It depends on the titling and the use. 815 ILCS 380/2 defines a covered "consumer" to include the first retail purchaser AND a transferee during the statutory warranty period; the statute's covered "vehicle" excludes a vehicle used "primarily for commercial purposes." An owner-operator contractor's single Sierra 2500HD titled to the LLC but used for jobsite work has historically been accepted where the case-by-case record supports personal/household use over a pure commercial fleet operation. A 10-truck fleet titled to a corporation and run on dispatch is typically outside 815 ILCS 380 and we route those claims directly to a Magnuson-Moss federal count, which has no equivalent commercial-use exclusion when a written warranty is involved.
Do I have to go through BBB AutoLine before suing GMC in Illinois?
For now, yes. The Illinois Attorney General's Consumer Protection Division is the agency that certifies manufacturer informal dispute settlement procedures under 815 ILCS 380/4. General Motors LLC (including the GMC brand) has been operating under BBB AutoLine certification in Illinois, and 815 ILCS 380/4 makes the 815 ILCS 380/3 refund-or-replacement remedy unavailable until you resort to that certified procedure first. We do not wait on the BBB AutoLine outcome to send the 815 ILCS 380/3 written manufacturer notice — both go out the same week so both clocks burn inside the 18-month 815 ILCS 380/7 window in parallel.
I bought my Sierra at a Wisconsin GMC dealer but I live and register it in IL. Where do I file?
Illinois, in most cases. 815 ILCS 380/2 covers a vehicle "purchased or used primarily for personal, family, or household purposes" by an Illinois consumer, and Cook, DuPage, Lake, and McHenry Circuit Courts have repeatedly accepted Wisconsin- or Indiana-purchased Sierras titled and operated in Illinois where the nonconformity arose during Illinois operation. The bill-of-sale state, the Illinois Secretary of State title-transfer date, and the geographic distribution of dealer repair attempts all feed the analysis. We pull all three before filing.
What does representation cost on an Illinois GMC case?
Out of pocket: nothing. 815 ILCS 380 does not contain a mandatory state attorney-fee shift, so we pair the IL state count with a federal Magnuson-Moss Warranty Act count under 15 U.S.C. §2310(d)(2) — that provision requires an Illinois federal or state court to award reasonable attorney fees, costs, and expenses to a prevailing consumer. If the dealer or GM committed any independent deceptive practice (misrepresenting the vehicle history, the warranty terms, or a covered repair), the Illinois Consumer Fraud Act (815 ILCS 505/10a) adds a separate state-law fee-shift. Easy Lemon takes Illinois GMC cases on the statutory fee-shift basis only — recovery to the consumer is not netted against fees.
My Hummer EV is past the 12-month / 12,000-mile window but the propulsion faults keep coming back. Do I still have a case?
The 815 ILCS 380 state claim is governed by the 12-month / 12,000-mile statutory window plus the 18-month 815 ILCS 380/7 SOL — once the qualifying nonconformity arose inside the warranty period the state remedy can still be pursued up to 18 months from delivery, but new defects that first appeared outside the window do not count for the state statute. Magnuson-Moss federal warranty claims have a four-year U.C.C. limitations period and remain available against GM while any portion of the manufacturer warranty (new-vehicle, powertrain, or Hummer EV battery/propulsion coverage) is in effect. The Hummer EV's HV battery and propulsion warranty terms run materially longer than the new-vehicle bumper-to-bumper, which is why we often pivot post-window Hummer EV cases to a pure Magnuson-Moss strategy.
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Run Your Sierra, Yukon, Acadia, Terrain or Hummer EV Through the Illinois Filing Test
Free case review with the same lemon-law team that handles GMC Denali, AT4, Sierra HD, and Hummer EV / Sierra EV filings every week in Illinois. Two clocks govern your window — the 12,000-mile / 12-month 815 ILCS 380/3 statutory warranty period, and the 18-month 815 ILCS 380/7 statute of limitations from original delivery. Both close fast on a Sierra HD on contractor duty or a Yukon Denali on a daily school-run. We pre-audit your repair-order history against the four-attempt and 30-business-day presumption triggers, mail the certified 815 ILCS 380/3 manufacturer notice to GM Detroit, open the BBB AutoLine claim, and have the Cook / DuPage / Lake / Will / Kane / Winnebago / McLean / Sangamon Circuit Court complaint ready to drop the day BBB AutoLine fails. Magnuson-Moss (15 U.S.C. §2310(d)(2)) pleads alongside — that is the federal fee-shift that pays our work.