2003 Cadillac DeVille Service and Repair Manual

This manual is built for the 2003 Cadillac DeVille alone, matched to its year, engine and trim so the torque values, wiring diagrams and diagnostic steps inside are the ones Cadillac published for the 4.6L V8 (VIN Y, LD8) and 4.6L V8 (VIN 9, L37) under your hood, not a generic figure pulled from a different DeVille year.

Engines covered

• 4.6L V8 (281 cu in) — DOHC, naturally aspirated, gasoline

Body styles covered

• 4-door hearse
• 4-door sedan
• 4-door limousine

Trims covered

• Base
• DHS
• DTS

Known issues on the 2003 DeVille. Four recalls are on federal record for this model year. One covers the ignition key ring: a key knocked out of the run position can keep the air bags from deploying in a crash and can also cause a sudden loss of engine power, power steering, and power braking. Two separate recalls cover the driver-side frontal air bag inflator module, which can fracture or rupture, sending pieces that can strike and injure occupants while leaving the cushion unable to inflate fully to protect the driver. The fourth covers the fuel tank assembly, where a malfunctioning pressure sensor can damage fuel system components and let fuel leak out during refueling, a fire risk in the presence of an ignition source. Owners have filed 148 complaints for the year. The factory diagnostic and repair procedures behind each of those systems are here.

Whether you're tracing an air bag inflator concern, inspecting the fuel tank pressure sensor, or working through a routine service interval, it keeps you on the OEM procedure and the correct specification for your specific 2003 DeVille.