Todd G.

An ABS light on a GMT800 is usually a wheel speed sensor — and up front, that sensor lives inside the hub bearing. Here’s how to find the bad corner before you throw parts at it.

EVAP codes on a GMT800 usually start at the cheapest part — the gas cap — and work toward the vent and purge solenoids. Here’s the order to check so you don’t buy a canister you didn’t need.

A cold-start tick that fades as the GMT800 warms up is usually a broken exhaust manifold bolt, not a $3,500 lifter job. Here’s how to tell them apart before you panic.

That clunk when you turn the GMT800 wheel is almost always the intermediate steering shaft. Here’s the real fix versus the grease band-aid, plus when it’s actually a worn idler or pitman arm.

A GMT800 that cranks but won’t start is usually fuel, spark or security. Here’s how to check fuel pressure the right way and stop guessing before you drop the tank.

P0327 and P0332 on an LS Vortec are almost always corroded knock sensors buried in the valley under the intake. Here’s the right way to fix it once — sensors, connectors and sealing.