Avoid: 2006, 2005 (lowest Year Scores on complaints per year on the road, crash reports and recalls)
Best: 2010 (few owner reports)
7 model years of NHTSA owner complaints and recalls · How we grade
Across 6 model years, the Cadillac STS has 367 owner-filed NHTSA complaints and 10 recalls on record. The most-reported areas are air bags and electrical system. 2006 drew the most complaints (141), 2011 the fewest (7).
Source: NHTSA complaints and recalls filed for Cadillac STS vehicles (US, public record). Typical used asking price $6,080–$9,349.
Complaint volume by model year. Raw NHTSA totals, not adjusted for sales volume or time on the road, so older and higher-selling years accumulate more. Every year links to its full breakdown.
Highest: 2006 (141 complaints). Lowest: 2011 (7).
Sentiment is mixed and heavily dependent on model year and powertrain.
Very frequent leaks from valve covers, oil pan, and less commonly the half-case seal.
Worn motor mounts, differential bushings, and driveshaft carrier bearings (especially on AWD models) causing clunks, shudders, and shifting harshness.
Related to excessive oil consumption from a flawed PCV system; can lead to chain stretch and failure if oil is not monitored and topped up frequently.
Specific components like the AWD driveshaft carrier bearing are not sold separately by GM, requiring entire assembly replacement.
Use of hard, brittle plastics and overall fit/finish criticized as subpar for the luxury segment, especially in mid-2000s models.
Owner insights cover all generations of the STS. Individual model years are broken down above.
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