They look identical at first glance, but swapping the wrong glow plug on your 3.0 Duramax can lead to serious — even engine-destroying — problems. Discover the key differences between LM2 (73G) and LZ0 (72G) glow plugs, including voltage requirements, control module changes, fragility warnings, proper testing methods, and must-follow installation tips to keep your diesel running strong.

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) with 3.0L Diesel...