GM Repair, Maintenance & Parts Guides
439 guides for Chevrolet, GMC, Buick and Cadillac owners — written by people who work on these vehicles, and linked to the exact parts that fit. Every guide starts with the answer, not a preamble. Where a torque spec or part number varies by year, engine or trim, we say so and show you how to confirm it for your own vehicle rather than handing you a generic number that might be wrong.
Browse by topic below, or jump straight to our best-selling GM parts.
Browse by topic
GM Diagnostics & Trouble Codes — 103 guides
Something is wrong and you need to know what. P-codes, warning lights, no-start diagnosis, strange noises, and what each symptom actually points to. Start here before you buy a part. → All 103 diagnostic guides
GM Parts & Accessories Guides — 100 guides
Fitment charts, part-number cross-references and buying comparisons. What fits your year, model and engine — and just as importantly, what does not. → All 100 parts guides
GM Repair Guides — 62 guides
Named component failures and what it takes to fix them: lifters, timing chains, water pumps, transmissions, actuators. Symptoms, causes, and the full parts list for the job. → All 62 repair guides
GM Maintenance & Service — 43 guides
Scheduled service, oil specs, filters, fluids and intervals. Includes ACDelco cross-reference charts so you order the right filter the first time. → All 43 maintenance guides
GM Owner How-To & Vehicle Operation — 33 guides
Using the truck as designed: 4WD modes, tow/haul, trailer wiring and hitches, key fobs, infotainment and EV charging setup. → All 33 owner guides
GM Model Guides & Comparisons — 36 guides
Trim, engine and generation comparisons, towing capacities and specs. For the research phase, before you commit. → All 36 model guides
GM Recalls, Safety & Ownership — 19 guides
How to check recalls by VIN, what your warranty actually covers, driver-assist systems, and theft prevention. → All 19 safety guides
Shop Tools & Equipment — 17 guides
Torque wrenches, OBD2 scanners, floor jacks, air tools and compressor setup. Buying the tool once instead of twice. → All 17 tool guides
GM Performance & Tuning — 16 guides
Going beyond stock: leveling and lift kits, shock upgrades, tuning and cosmetic mods, with honest notes on what each one actually changes. → All 16 performance guides
GM Interior Care & Protection — 10 guides
Floor liners, cargo mats and cabin cleaning — keeping the interior worth something at resale. → All 10 interior guides
Start here
If you are not sure where to begin, these are the guides most owners get the most out of:
- ACDelco oil filter cross-reference: PF63, PF64, PF48 and PF66 — which filter actually fits your engine
- GM bulb size chart — headlight, fog and tail bulbs across the lineup
- GM lug nut sizes and torque specs — and why generic torque charts get this wrong
- MAF, MAP or O2 sensor? — which one to replace for a rough idle
- GM bolt patterns and wheel offsets by model — 6x139.7, 6x120 and 5x120 explained
Shop by vehicle
Silverado & Colorado · Sierra & Canyon · Tahoe & Suburban · Yukon & Yukon XL · Terrain & Acadia · Equinox, Blazer & Traverse · Camaro, Malibu & Cruze · Corvette · Cadillac · Buick · Chevrolet EVs · Sierra EV & Hummer EV · Vans & Commercial
Shop by system
Brakes · Suspension & steering · Engine & drivetrain · Electrical & ignition · Oil, filters & fluids · Exhaust & emissions · Body & trim · Wheels & tires · Towing & hauling · Truck bed · Interior · Tools & equipment
Not sure which part fits?
The single most common reason a part goes back is that it was right for the model but wrong for the year, trim or engine. Check your year, model and engine before you order — and when a guide on this site cannot confirm a spec for your exact configuration, it will tell you so rather than guess.