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.

General Motors has launched a new emissions recall that affects certain 2024 Chevrolet Silverado HD and GMC Sierra HD trucks equipped with the 6.6L L5P Duramax. Recall ID: N242438500 Title: ECM OBD – Selective Catalyst Reduction (SCR) Fault Detection Release Date: November 2025 Applies To: 2024 Chevrolet Silverado 2500HD / 3500HD (L5P 6.6L Duramax) 2024 GMC Sierra 2500HD / 3500HD (L5P 6.6L Duramax) This is a voluntary emissions recall focused on the software that monitors

GM’s Customer Satisfaction Program N252507990 addresses an out-of-spec jack kit lifting rod on select 2025 GM trucks and SUVs. Dealers will replace the lifting rod at no charge through December 31, 2027. Learn which models are affected, how to check your VIN, and what to expect at the dealer.

When news broke that OXE Marine and GM Marine had signed a development agreement to use Duramax engines in a new generation of diesel outboards, most people saw it as a marine story. For 3.0 Duramax owners, it is something else entirely: It’s a strong signal that GM sees the LZ0 3.0L Duramax inline-six as a long-term platform, not a short-lived experiment. In this article, we’ll break down what the agreement actually says, why it matters for truck and SUV owners, and how a

This will be the location for a compilation of build dates that hav / have not had an engine failure. The purpose of this article is to give us some sort of timestamp as to when these engines / vehicles were actually built. Hopefully set some minds at ease as well to show how many true failures there have been. this is a small sampling from a video posted here: https://youtu.be/WmlzcwNtdjY UPDATE - 11/11 9:10 PM Update 11/12 7:45 - No new engine failures to report UPDATE - 11

GM released a Gen-3 service valve body for 10L60/80/90. It improves robustness and sediment control, removes the auxiliary body, relocates key solenoids, simplifies harnessing and flow, deletes the internal TBV lineup on certain RPOs, and includes a revised bolt kit. First field units appeared around Aug 2025; bulletin issued Oct 29, 2025.

Truck: 2024 Chevrolet Silverado 1500 ZR2 Goal: Fit the tallest tire possible without any modifications (no trimming, no spacers, no level kit) and document real‑world results. TL;DR It fits: An LT285/75R18 (~35") mounted on OEM 18" ZR2 wheels fits without trimming for normal driving. Edge case rub: At full steering lock while reversing into a driveway , there is a faint rub only as the suspension compresses over the bump . Daily driving and forward lock tests were clea

Swapped my 2024 Silverado 1500 ZR2 from 275/70R18 to the exact LT285/75R18 E tires used on the Silverado EV Trail Boss. Fitment is clean—only a faint rub at full lock in reverse as the suspension compresses; no trimming yet. The big question is PSI. Don’t copy the EV’s ~56 psi placard (that truck’s ~3,000 lb heavier), and don’t stay at stock ~38 either. With LT-E you set pressure by load: start 46–48 psi cold empty; 58–62 psi rear when towing; fine-tune via hot-rise/tread che

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

GM bulletin 25-NA-307 (LZ0 3.0 Duramax, 2025–2026) links bellhousing-area noise + MIL/P06DD to excessive crankshaft end play (possible thrust-bearing failure). Dealers should measure end play at the crank pulley bolt with a dial indicator; spec is 0.084–0.316 mm (0.0033–0.0124 in). Expect to pay diagnostic time for the check; if out of spec, repairs proceed per SI.

GM has issued TSB #25-NA-255 for 2021–2024 trucks and SUVs with the 10-speed. Instead of replacing the valve body for P0747, the fix now calls for a new feed-limit valve, spring, and spacer plate—marking a major shift in how dealers handle this common transmission failure.

Release: September 2025 • Bulletin: N252508341 • Applies to (LM2 3.0L Duramax):Chevrolet: Silverado 1500 (2021–2022), Suburban...

Release: September 2025 • Bulletin: N252508340 • Applies to: 2023 Chevrolet Silverado 1500 / 2023 GMC Sierra 1500 with LZ0 3.0L...

You’ve seen the window sticker. You’ve read the marketing. And if you’re like me, you’ve probably asked yourself: “Okay, but can this...

P2C7A on the 3.0 Duramax means the SCR/NOx catalyst isn’t meeting efficiency. Learn the real causes, exact diagnostics, and fixes for LM2/LZ0.