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.

Bulletin: GM Service Bulletin # 25-NA-202 (Oct 21, 2025) — “LZ0 Turbocharger Replacement.” Vehicles: 2023–2026 Silverado/Sierra 1500 (LZ0), 2025 Tahoe/Suburban/Yukon with LZ0. The Issue? GM notes a portion of LZ0 turbo failures are associated with incorrect engine oil and/or low oil level . Translation: your turbo’s life hinges on using the exact diesel spec and keeping the sump properly filled. (Bulletin # 25-NA-202 summary.) What “wrong oil” means on the LZ0 The 3.0L Du