The GM Service Guy

Hesitation under load, hard restarts, and injector damage can all trace back to a weak or missing lift pump. Here's why this matters so much on the Duramax.

The L5P Duramax raised the bar on power and refinement, but its high-pressure common rail injectors are the engine's most expensive known weak point. Here's what to watch for.

The 2011-2016 LML Duramax is a strong engine, but its EGR cooler and DEF system are its two most common weak points. Here's how to catch them early.

Almost every modern direct-injection GM engine builds carbon on its intake valves over time. Here's why it happens, the symptoms to watch for, and why a bottle of injector cleaner...

GM is actively investigating a stalling issue on the redesigned Traverse, Acadia & Enclave turbo engines. Here's what's known, what to watch for, and what to do if it happens...

Rough restarts, delayed engagement, or a system that won't activate at all — here's what's actually going on with your GM vehicle's Auto Start-Stop system, and your real options.

The 2.7L Turbo (L3B/L3B-2) in newer Silverado and Sierra trucks has its own set of known issues. Here's what to watch for and how to keep it running right.

A Malibu that stalls, shudders, or loses power without warning has a handful of well-documented causes. Here's how to work through them systematically.