2007 Cadillac STS
2007 Cadillac STS
Overview
The 2007 Cadillac STS, a luxury sedan, offered a blend of performance and comfort. It was available with different powertrain options, including a V6 and a more potent V8, aiming to cater to a range of driving preferences. While generally considered a competent vehicle for its era, like any automotive model, it has specific areas where owners have reported issues. This analysis focuses on common technical reliability concerns, excluding routine maintenance and standard wear and tear, to provide a clear picture of potential problem areas for prospective buyers or current owners.
Engine
3.6L V6
Timing Chain Issues
- Symptoms: Rattling noise from the front of the engine, especially on startup; check engine light.
- Solution: Replacement of timing chain, tensioners, and guides.
- Cost: $1,200 - $2,500
Oil Leaks
- Symptoms: Visible oil on the engine block, oil smell, low oil level.
- Solution: Replacement of leaking gaskets or seals (e.g., valve cover gaskets, oil pan gasket).
- Cost: $300 - $800
4.6L V8
Oil Leaks
- Symptoms: Visible oil on the engine block, oil smell, low oil level.
- Solution: Replacement of leaking gaskets or seals (e.g., valve cover gaskets, oil pan gasket).
- Cost: $300 - $800
Coolant Leaks
- Symptoms: Low coolant level, visible coolant puddles, engine overheating.
- Solution: Replacement of leaking hoses, water pump, or radiator.
- Cost: $400 - $1,000
Transmission
6-Speed Automatic (6L50/6L80)
Harsh Shifting / Slipping
- Symptoms: Jerky gear changes, delayed engagement, slipping between gears.
- Solution: Transmission fluid and filter change, solenoid replacement, or full transmission rebuild.
- Cost: $500 - $3,000+
Torque Converter Issues
- Symptoms: Shuddering at low speeds, slipping, or failure to engage.
- Solution: Replacement of the torque converter.
- Cost: $800 - $1,800
Suspension
Standard Chassis
Front Control Arm Bushings
- Symptoms: Clunking noises over bumps, vague steering feel, uneven tire wear.
- Solution: Replacement of front control arm bushings or the entire control arm assembly.
- Cost: $400 - $700
Rear Air Suspension (if equipped)
- Symptoms: Vehicle sagging in the rear, air leaks, compressor failure.
- Solution: Repair or replacement of air springs, air lines, or compressor.
- Cost: $500 - $1,500
Electrical
Body Control Module (BCM)
Intermittent Electrical Failures
- Symptoms: Malfunctioning power windows, locks, lights, or dashboard indicators; warning lights.
- Solution: Diagnosis and potential reprogramming or replacement of the BCM.
- Cost: $600 - $1,200
Infotainment System
Screen Glitches / Freezing
- Symptoms: Touchscreen unresponsive, display errors, system reboots.
- Solution: Software update or replacement of the infotainment unit.
- Cost: $500 - $1,500
Exterior
No widespread issues reported.
No major issues reported for this configuration.
Interior
No widespread issues reported.
No major issues reported for this configuration.
Summary Verdict
The 2007 Cadillac STS presents a mixed reliability profile. The V6 and V8 engines can be prone to oil leaks and, in the case of the V6, timing chain issues. The automatic transmission may exhibit harsh shifting or torque converter problems. Suspension components, particularly front control arm bushings, are a common wear item that can lead to noise and handling degradation. Electrical gremlins, often related to the Body Control Module or infotainment system, can also arise. While the exterior and interior generally hold up well, potential buyers should be aware of these powertrain, suspension, and electrical concerns. Thorough pre-purchase inspection is highly recommended.