GM has updated Engineering Information bulletin PIE0883A for 2026 3.0L Duramax (3MAX) trucks and SUVs, closing its P2463 investigation and directing technicians to inspect the turbo outlet–to–resonator connection for possible airflow issues behind the check engine light.

The latest GM service bulletin # 26-NA-090 , released on March 12, 2026 , provides key information on calibration releases for the 3.0L Duramax diesel (LZ0)  in 2025 pickup trucks. This is an informational bulletin  guiding dealers on available ECM (Engine Control Module) software updates to address illuminated Malfunction Indicator Lamp (MIL)  concerns. Affected Vehicles Chevrolet Silverado 1500  (2025 MY) with 3.0L Diesel (LZ0), all transmissions GMC Sierra 1500  (2025 MY)

GM has updated two service bulletins addressing a frustrating issue reported by 3.0 Duramax owners: DEF warnings appearing shortly after beginning a towing trip. The documents acknowledge the behavior and introduce a software update intended to correct how the system reports DEF levels on newer Silverado and Sierra trucks.

Owners of the 2023-2024 Chevrolet Silverado 1500  and GMC Sierra 1500  equipped with the 3.0L LZ0 Duramax turbodiesel engine  may experience an annoying buzz, rattle, vibration, or noise  coming from the passenger side  of the vehicle. This issue typically occurs under light load  conditions, such as gentle acceleration, cruising at low throttle, or light engine demand. The noise can mimic an interior trim rattle or dash vibration but is actually external, originating from th

GM's new PIE0905 bulletin targets MIL illumination and DTC P0101 on 2025-2026 LZ0 Duramax models (Silverado 1500, Sierra 1500, Tahoe, Suburban, Yukon). It's an early data-collection step: dealers gather intake leak/test details to help engineers identify root causes before issuing a full TSB fix. U.S. dealers only—contact required before repairs. If your truck shows this code, see a dealer soon.

GM has updated bulletin #25-NA-299, expanding P2C7A diagnostic guidance to cover 2026 3.0L Duramax trucks and SUVs. The revision reinforces a critical point: this code is often caused by exhaust or induction leaks — not failed sensors or catalysts. Special attention should be given to front exhaust connections and the LM2 backpressure valve, with pressure testing and soap solution used to confirm leaks before replacing parts.

GM has released new service information addressing a 3.0 Duramax condition where the engine idles normally but hesitates, loses power, or stalls during acceleration. The cause points to an internal restriction in the charge air cooler hose — a component critical to proper boost and airflow on both LM2 and LZ0 engines.

General Motors has issued Safety Recall N252516560 – Momentary Rear Wheel Lock-Up , but this is not a brand-new transmission defect. Instead, this recall revisits a prior campaign to ensure the correct software calibration was actually installed. Here’s what’s going on. This Recall Ties Back to an Earlier Campaign According to the bulletin, this recall applies to certain: 2020 Chevrolet Silverado 1500 2020–2022 Chevrolet Silverado 1500 2020 Chevrolet Silverado 2500/3500 2020–

Erratic shifting, harsh gear changes, and transmission codes on your 10L80 may not be a software issue at all. A new GM bulletin reveals a hidden hydraulic failure inside the valve body that can mimic electronic problems—and explains why many trucks are misdiagnosed before the real cause is found.

GM Bulletin #26-NA-052 applies to 2026 Silverado and Sierra 1500 trucks equipped with the 3.0L LZ0 Duramax diesel. The bulletin addresses multiple fuel system and aftertreatment–related DTCs, including forced engine shutdown and emissions efficiency faults, and resolves them through an Engine Control Module calibration update—no parts required.

Written by Greg Nelson GM Technician | DuramaxNews.com Host of The 3.0 Duramax Podcast  and the DemonWorks YouTube channel Bulletin:  # 26-NA-001 Release Date:  January 8, 2026 A newly released bulletin from General Motors  highlights a front differential mounting issue on full-size GM SUVs that can escalate into frame replacement  if not addressed early. While the bulletin centers on a clunking or rattling noise, the underlying failure mode makes this a critical inspection i

GM revised Bulletin 24-NA-070 on January 6, 2026, expanding coverage for 3.0 Duramax vehicles experiencing no-restart events during Auto Stop/Start operation. The update adds DTC P1098, introduces engine coolant flow control valve replacement when required, and includes expanded warranty guidance. The revision provides clearer diagnostic and repair direction beyond ECM software updates alone.

GM bulletin PIT5689M addresses no-restart after Auto Stop, intermittent no-crank, dead battery, glow plug faults, transfer case errors, and multiple warning lights on Silverado and Sierra trucks. The root cause is often a loose or damaged engine-to-body ground at the passenger-side firewall (G132/G134). Inspecting and securing this ground can prevent widespread electrical faults and unnecessary parts replacement.

Updated:  December 16, 2025 Bulletin:  # 25-NA-380 Applies To:  Chevrolet Silverado & GMC Sierra (1500 / 2500HD / 3500HD) What Owners Are Experiencing GM has released bulletin # 25-NA-380  addressing customer complaints that only show up in cold weather , typically below 32°F (0°C) . Reported symptoms include: Harsh or stiff ride quality Increased road noise entering the cab Axle or mechanical noise that seems worse in cold temperatures What makes this issue frustrating is th

GM’s new PIE0883 bulletin investigates P2463 soot-loading issues on 2026 LZ0 Duramax engines. Dealers are asked to inspect sensors, airflow leaks, and installation quality before repairs. This follows the earlier crankshaft end-play bulletin (25-NA-307), marking another early reliability concern for the LZ0.

GM’s new 25-NA-369 bulletin tackles steady-speed vibration between 25–80 mph on 2021–2026 1500 trucks and SUVs. While many assume torque-converter shudder, the bulletin shows how sensitive the 10-speed is to Dexron ULV fluid condition and explains how to diagnose other common causes. GM requires a structured GDS/PICO diagnosis and a 20-quart ULV exchange only when TCC shudder is verified.

GM has updated bulletin #25-NA-185 for 3.0L Duramax coolant control valve failures, expanding coverage and requiring ECM calibration checks during replacement. Two related Special Coverages (N252508341 for LM2 and N252508340 for 2023 LZ0) may provide 15-year/150k-mile protection depending on VIN. This update clarifies repair paths and coverage options for owners.

If your Chevy or GMC infotainment screen is stuck on “Device is Starting…” and never loads the Home screen, you’re not the only one. GM has released bulletin PIC6630 with a specific software repair that lets dealers recover the A11 radio without always replacing hardware. In this article, I walk through the simple resets I would try at home first to avoid a service visit, and then explain exactly what your dealer will do using the Radio Data Reset function and a fresh softwar

GM has issued safety recall N252532020 for certain 2026 Chevrolet Silverado 1500, 2500HD, and 3500HD trucks that left the factory without a printed owner’s manual. Because the manual contains required FMVSS/CMVSS safety information on child seat anchors and crash protection, dealers must now provide and install the correct book in the glove box at no charge to the owner.

GM has released bulletin #25-NA-325 for 2026 Silverado and Sierra 1500 trucks equipped with the LZ0 3.0 Duramax and 10L80 (MQB) transmission to address a harsh or jerky engagement when the engine restarts after an Auto Stop event. The fix is a Transmission Control Module (TCM) software update, which dealers can apply after checking for the latest calibration, with no hard parts replaced.