2006 Cadillac STS Service and Repair Manual

This factory service and repair manual for the 2006 Cadillac STS is built around the exact engine, trim and model-year combination you own, including the 3.6L V6 (VIN 7, LY7), 4.6L V8 (VIN A, LH2) and supercharged 4.4L V8 (VIN D), so the torque values and diagnostic steps inside are the ones Cadillac actually published for this car, not an approximation borrowed from another STS year.

Engines covered

• 4.4L V8 (267 cu in) — DOHC, supercharged, gasoline
• 3.6L V6 (217 cu in) — DOHC, naturally aspirated, gasoline
• 4.6L V8 (281 cu in) — DOHC, naturally aspirated, gasoline

Body styles covered

• 4-door sedan

Trims covered

• Base
• V

Known issues on the 2006 STS. Four recalls are on federal record for this model year. The first covers the fuel pump module, whose electrical terminals can overheat and melt the flange, letting fuel leak and raising the risk of a stall or fire. The second covers all-wheel-drive V6 models where the electronic throttle control's torque-monitoring functions were not enabled, so an ECM hardware or software fault could let the throttle open wider than commanded. The third covers the rear axle pinion seal, which can leak fluid and, in a worst case, lead to a rear differential failure and loss of motive power. The fourth covers V6 fuel delivery, where fuel supply can cut out without any warning light or chime, leaving the engine unable to restart. Owners have filed 141 complaints for the year. The factory diagnostic and repair procedures behind each of those systems are here.

Whether you're chasing an intermittent fuel-delivery stall, inspecting the rear axle seal, or servicing the supercharged V8, it keeps you on the OEM procedure and the correct specification for your specific 2006 STS.