2024 Chevrolet Silverado 3500HD Lemon Law Case Study — Utah
A Brand-New 2024 Chevrolet Silverado 3500HD Duramax Returned for Eleven Warranty Repairs Before a Final Transmission Failure
Our client purchased a new 2024 Chevrolet Silverado 3500HD — a Class 3 heavy-duty Duramax diesel work truck — from Labrum Chevrolet, an authorized General Motors dealership in Utah, on July 5, 2023. The truck had only 11 miles on the odometer at delivery. Within just over two months the “Service Engine Soon” light was illuminated and the dealer was performing the first of what would become eleven documented warranty repair events across nearly two years of ownership.
The repair history reads like a checklist of every Duramax HD aftertreatment and electrical-architecture failure mode that owner forums have been documenting since the trucks first hit lots: recurring DTC P2459 (DPF regeneration frequency) with 95% soot accumulation, DTC P122D (SCR system performance), a fully coked manifold absolute pressure sensor that had to be replaced and re-regenerated, a skewed mass airflow sensor, a starter that stayed engaged after the engine had already started, recurring “Service ESC” warnings, forward-collision-warning yaw-sensor calibration loss, infotainment system shutdown with audio loss, the truck unlocking itself randomly while parked, and a serial data gateway module recall. The case ended where many heavy-duty Silverado claims do — with a major transmission failure on June 6, 2025 that took the vehicle out of service for 49+ continuous days with no loaner and no documented repair-order resolution. By that point, eleven warranty visits across the same family of GM powertrain and electrical-architecture defects had crossed every meaningful Utah lemon law and Magnuson-Moss threshold.
What Went Wrong
- Recurring check-engine light with DTC P2459 (DPF regeneration frequency): First pass at Visit 2 in October 2023 was diagnosed as a skewed mass airflow sensor (replaced). The same code returned at Visit 8 in August 2024 with 95% soot accumulation, and the manifold absolute pressure (MAP) sensor was found fully coked — replaced, with a forced service regeneration performed
- DTC P122D / SCR fault detection: Visit 6 in April 2024 triggered a manufacturer-issued ECM/TCM recall update specifically targeting SCR fault detection on the Duramax aftertreatment system — a GM admission of an emissions-system nonconformity
- Recurring Service ESC and reduced-power events: “Service ESC” light returned at Visits 3, 4, and 5 alongside forward collision warning faults, yaw-sensor calibration loss, park-assist module communication issues, and ECM/TCM/EBCM software updates — the warning kept coming back
- Starter engaged after engine start (Visit 5): Technician confirmed the starter remained engaged after the engine fired — a serious safety condition — and the ECM, TCM, and EBCM were all reflashed
- Infotainment shutdown, audio loss, and random unlocking (Visit 7): Radio software updated under TSB; BCM and telematics control module reprogrammed because the truck was unlocking itself while parked
- Serial data gateway module recall (Visit 9): Manufacturer-issued recall completed — another GM admission of an electrical-architecture nonconformity in this build
- Major transmission failure (Visit 11): Vehicle towed in on June 6, 2025 with the client reporting “something in the transmission went out.” No loaner provided; no repair-order resolution documented; the truck remained out of service for 49+ continuous days — the failure that closed the case for buyback eligibility under Utah Code Ann. § 13-32a
Eleven Warranty Visits at Labrum Chevrolet
Visit 1 — September 11, 2023 (1 Day)
- Check engine light and reduced acceleration warning appeared
- Technician identified a related GM service bulletin and re-flashed the ECM and TCM as instructed
Visit 2 — October 28, 2023 (1 Day)
- Check engine light illuminated again with stored DTC P2459 (DPF regeneration frequency)
- Technician determined the mass airflow sensor was skewed; the faulty MAF sensor was replaced
Visit 3 — November 27–28, 2023 (2 Days)
- “Service ESC” light and forward collision warning illuminated
- Technician reprogrammed the yaw sensor to address calibration loss
Visit 4 — December 12, 2023 (1 Day)
- “Service ESC” light returned and the truck entered reduced power mode
- Park-assist module communication issues identified; software update applied
- Radio screen rebooting issue reported — no diagnostic codes were stored and no fix was available at the time
Visit 5 — February 12, 2024 (1 Day)
- Starter stayed engaged after the engine had already started; ESC engaged unexpectedly
- Technician confirmed the starter function and updated the ECM, TCM, and EBCM software
Visit 6 — April 22, 2024 (1 Day)
- Check engine light on with stored DTC P122D (SCR system performance)
- Technician found systems operating normally and performed a GM-issued recall update to the ECM and TCM specifically related to SCR fault detection on the Duramax aftertreatment system
Visit 7 — May 6–7, 2024 (2 Days)
- Infotainment system shut off and lost sound intermittently
- Truck reported as unlocking itself randomly when parked
- Radio software update applied per TSB; the BCM and telematics control module were reprogrammed
Visit 8 — August 23–30, 2024 (8 Days)
- Check engine light illuminated again with stored DTC P2459 and 95% soot accumulation in the diesel particulate filter
- Technician found the manifold absolute pressure (MAP) sensor fully coked and replaced the sensor; a forced service regeneration was then run
Visit 9 — October 28–31, 2024 (4 Days)
- Recall performed for the serial data gateway module
- Dash rattle and check engine light concern documented but could not be duplicated
- Radio glitch reported — software update applied per bulletin
Visit 10 — December 3, 2024 (~1 Day)
- Client reported irregular shifting, shuttering from a stop, and harsh downshifting on the Duramax / Allison-class transmission
- ECM and TCM were reprogrammed and shift adapts were reset
- Recall for remote start programming also completed at this visit
- Repair order documented only the promised date; no in/out service window was recorded
Visit 11 — June 6, 2025 to Present (49+ Days, Vehicle Still Out of Service at Settlement)
- Truck brought in for major transmission failure with the client stating “something in the transmission went out”
- No loaner vehicle provided
- The dealer never produced a final repair order — exact root cause was not documented
- Vehicle remained out of service from June 6, 2025 through the buyback settlement — well in excess of any Utah lemon law cumulative-days threshold on a single visit alone
- At this point — eleven warranty repair events, recurring DPF/SCR aftertreatment defects, multiple GM-issued recalls and ECM/TCM reflashes, and a final 49+ day transmission failure with no documented resolution — a Utah lemon law and federal Magnuson-Moss buyback claim was the only viable path forward
Why This Silverado 3500HD Qualified for a Buyback
Utah’s New Motor Vehicle Warranties Act sets a more demanding state-law threshold than many of its neighbors — it generally requires four or more repair attempts for the same nonconformity, or thirty or more cumulative business days out of service, all within the first year of original delivery. But Utah is not the only available remedy. The federal Magnuson-Moss Warranty Act lets owners enforce a written warranty on any vehicle with a powertrain or bumper-to-bumper warranty when the manufacturer has failed to permanently repair a substantial defect — and on this Silverado 3500HD, eleven warranty repair events plus a 49+ day transmission failure made both legal frameworks airtight.
This case presented several compelling legal factors:
- Utah Lemon Law eligibility (Utah Code Ann. § 13-32a): Utah’s New Motor Vehicle Warranties Act protects buyers of new motor vehicles purchased in Utah within the first year of original delivery. Visits 1 through 5 all occurred inside that protected presumption window (September 2023 through February 2024, vs. a July 5, 2023 delivery date), and the same-defect prong was satisfied multiple times over — DTC P2459 / DPF aftertreatment recurred at Visits 2 and 8, “Service ESC” recurred at Visits 3 and 4, and ECM/TCM reflashes were performed at Visits 1, 5, 6, and 10.
- Cumulative-days-out-of-service prong: The June 6, 2025 transmission failure took the truck out of service for 49+ continuous days at a single visit — on its own, an open-and-shut clearance of the 30-business-day cumulative-days threshold under Utah Code Ann. § 13-32a, even before counting the 8 days at Visit 8 (DPF/MAP sensor) and 4 days at Visit 9 (serial data gateway recall).
- Manufacturer-issued recalls and service bulletins confirm the defects existed: General Motors itself issued recall updates to the ECM/TCM for SCR fault detection (Visit 6), a serial data gateway module recall (Visit 9), and a remote start programming recall (Visit 10) — manufacturer admissions that components in this truck required correction.
- Pattern of recurring Duramax aftertreatment nonconformities: DTC P2459 returning with 95% soot accumulation and a fully coked MAP sensor — eight months after the first MAF sensor replacement for the same code — is the exact pattern the federal Magnuson-Moss Warranty Act was written to redress: a defect the manufacturer had repeated opportunities to repair under warranty and could not.
- Final-visit transmission failure with no documented repair: The dealer never produced a final repair order on the June 6, 2025 visit. A 49-day disappearance with no resolution and no loaner is itself a substantial impairment of use under both Utah law and the Magnuson-Moss substantial-impairment standard.
- Federal Magnuson-Moss Warranty Act: Repeated unsuccessful warranty repairs on a written-warranty nonconformity triggered a federal claim with attorney-fee shifting against General Motors LLC, allowing our client to keep the full Buyback recovery separate from legal fees.
How Easy Lemon Secured a Buyback
Free Case Evaluation
We reviewed the complete repair history and confirmed eleven documented warranty repair events at Labrum Chevrolet, with the first five visits all inside the protected one-year Utah presumption window from the July 5, 2023 delivery date.
Documentation & Case Building
Our team compiled every repair order, stored DTC (P2459, P122D), control-module reprogramming (ECM, TCM, EBCM, BCM, telematics control module, park-assist module, yaw sensor), GM recall service action (SCR fault-detection ECM/TCM recall, serial data gateway module recall, remote start programming recall), Duramax aftertreatment intervention (MAF sensor replacement, MAP sensor replacement, forced service regeneration), and final-visit transmission failure note into a buyback-grade timeline showing General Motors’ inability to permanently repair the truck.
Demand to General Motors LLC
We filed a formal demand against General Motors LLC citing Utah’s New Motor Vehicle Warranties Act (Utah Code Ann. § 13-32a) and the federal Magnuson-Moss Warranty Act — documenting eleven repair attempts, a 49+ day single-visit transmission disappearance, recurring DPF/SCR aftertreatment defects, and three GM-issued recalls confirming nonconformity.
Buyback Recovered
Easy Lemon successfully negotiated a Buyback under Utah Code Ann. § 13-32a — General Motors repurchased the Silverado 3500HD and refunded the purchase price (down payment, monthly payments, sales tax, registration, and finance charges) less a statutory mileage offset. Our client paid nothing out of pocket for legal representation; General Motors paid all attorney fees separately under the federal Magnuson-Moss fee-shifting provision.
Vehicle Buyback Recovered Under Utah Code Ann. § 13-32a
Key Case Facts
- Vehicle: 2024 Chevrolet Silverado 3500HD (Class 3 heavy-duty Duramax diesel pickup)
- Purchased in: Utah (Labrum Chevrolet, July 5, 2023)
- Status at purchase: Brand new (11 miles at delivery)
- Mileage at last documented service / settlement: 45,000
- Primary defects: Recurring DTC P2459 (DPF regeneration frequency) with 95% soot accumulation and a fully coked MAP sensor; DTC P122D (SCR system performance) addressed via GM recall ECM/TCM update; recurring “Service ESC” warnings with park-assist and yaw-sensor faults; starter that stayed engaged after engine start; infotainment shutdown, audio loss, and random unlocking; serial data gateway module recall; harsh downshifting and shuttering from stop; and a final 49+ day transmission failure on June 6, 2025 with no documented repair-order resolution
- Repair attempts: 11 documented warranty repair events at Labrum Chevrolet
- Days out of service: 49+ continuous days at the final visit alone, plus 8 days at Visit 8 and 4 days at Visit 9 — well in excess of Utah’s 30-business-day cumulative-days threshold
- Manufacturer: General Motors LLC
- Settlement type: Buyback — vehicle repurchased under Utah Code Ann. § 13-32a, surrendered to General Motors at an authorized dealership
Results may vary. Prior outcomes do not guarantee a similar result. Each case is unique and depends on its specific facts and applicable law. Attorney advertising. Easy Lemon® by RockPoint Law P.C.
What Our Clients Are Saying
Attorney on Record
Steven Nassi, Esq.
Managing Partner — Easy Lemon by RockPoint Law P.C.
Licensed attorney specializing exclusively in lemon law across all 50 states. Steven leads the Easy Lemon legal team and has overseen thousands of successful lemon law claims against major manufacturers including General Motors (Chevrolet, GMC, Cadillac, Buick), Stellantis, Ford, Tesla, BMW, Mercedes-Benz, and more.
Having Problems With Your Chevrolet Silverado HD?
Repeated “Service Engine Soon” lights, DPF/SCR aftertreatment faults, MAP sensor coking, or transmission shudder in a Silverado 2500HD or 3500HD you trusted are unacceptable — and in Utah, you may already qualify for a Buyback or cash settlement. Free case evaluation — 30 seconds.
Qualify in 30 Seconds →Frequently Asked Questions
Your Chevrolet May Have a Lemon Law Claim Too
If your Chevrolet keeps going back to the shop for the same problem, you may qualify under your state's lemon law — the manufacturer pays our fees, not you. We handle Chevrolet cases like this one regularly.
See Our Chevrolet Lemon Law Page →