The 2006 Cadillac STS is a mid-size luxury sedan representing Cadillac's attempt to blend performance and comfort. It's a four-door sedan, part of the second generation STS (2005-2011). Key trims included the base model, V6, and V8. New pricing ranged approximately from $40,000 to $50,000. It stood out due to its sharp styling, available Northstar V8 engine, and technology features, offering a somewhat sportier alternative to the more traditional Cadillac DTS.
The Good
The 2006 Cadillac STS offers respectable performance, especially with the V8. It provides a comfortable ride and a stylish design that appeals to those seeking a blend of luxury and sportiness. From a practical standpoint, it delivers decent value for its class, while the Northstar V8 provides an emotionally satisfying driving experience. Rear-wheel drive handling is another advantage for enthusiast drivers.
The Bad
Potential weaknesses of the 2006 Cadillac STS include reported issues with the Northstar V8, such as head gasket failures, and electronic component failures. Some owners report problems with the suspension and various interior features. Pre-purchase inspections are essential to check for these issues. Check the condition of the leather and interior trim, as some materials can show wear.
2006 Cadillac STS: Quick Overview
- Engine Options:
- 3.6L V6: 255 horsepower
- 4.6L Northstar V8: 320 horsepower
- Horsepower:
- V6: 255 hp
- V8: 320 hp
- Fuel Economy:
- V6: Approximately 18 mpg city / 27 mpg highway
- V8: Approximately 16 mpg city / 25 mpg highway
- 0-60 Times:
- V6: Around 7.5 seconds
- V8: Around 6.0 seconds
- Towing Capacity: Not designed for towing. Towing capacity is minimal and not recommended.
- Trim-Level Features:
- Base: Leather seats, dual-zone climate control, power accessories, Bose audio system.
- V6: Typically includes upgraded wheels, sometimes additional convenience features.
- V8: Performance-tuned suspension, Magnetic Ride Control, more premium interior materials, available navigation, and advanced safety features. Options include sunroof, heated seats, upgraded audio, and various driver-assistance packages.
2006 Cadillac STS Specifications
Vehicle Information
| Year | 2006 |
| Make | Cadillac |
| Model | STS |
| Trim | - |
| Style | V-8 |
| Type | Sedan |
| Category | Minicompact Car |
Manufacturing Details
| Made In | United States |
| Manufacturing City | BOWLING GREEN |
Dimensions
| Doors | 4-Door |
| Curb Weight | 3940 pounds |
| Gross Vehicle Weight Rating | - |
| Overall Height | 57.60 inches |
| Overall Length | 196.30 inches |
| Overall Width | 72.60 inches |
| Wheelbase Length | 116.40 inches |
| Standard Seating | 5 |
Engine & Performance
| Engine | 4.6-L V-8 DOHC 32V |
| Engine Size | 4.6L |
| Engine Cylinders | 8 |
| Transmission | 5-Speed Automatic |
| Transmission Type | Automatic |
| Transmission Speeds | 5-Speed |
| Drivetrain | Rear-Wheel Drive All-Wheel Drive |
Additional Features
| Anti-Brake System | 4-Wheel ABS |
| Steering Type | Rack & Pinion |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | $47,520 |
| Invoice Price | $44,431 |
| Delivery Charges | $720 |
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Analysis
Analysis
What Problems Does the 2006 Cadillac STS Have?
Frequently reported problems for the 2006 Cadillac STS often revolve around the 4.6L Northstar V8 engine. Head gasket failures are a significant concern, potentially leading to costly repairs. Other issues include problems with the electronic systems, such as the navigation and entertainment systems, as well as sensor malfunctions. Suspension components, especially the Magnetic Ride Control system in V8 models, can be prone to failure and expensive to replace. Some owners have reported issues with the transmission, experiencing rough shifting or complete failure.
Recalls for the 2006 STS may vary depending on the specific vehicle and region, so it's important to check the NHTSA (National Highway Traffic Safety Administration) website for the latest recall information. Typical recalls might include issues related to airbags, fuel systems, or electrical components.
Long-term reliability can be a concern due to the complexity of the vehicle's systems and the potential for the aforementioned issues to arise with age and mileage. Regular maintenance and addressing problems promptly can help mitigate these risks, but potential buyers should be aware of the potential for higher repair costs compared to some competitors.
Recalls for the 2006 STS may vary depending on the specific vehicle and region, so it's important to check the NHTSA (National Highway Traffic Safety Administration) website for the latest recall information. Typical recalls might include issues related to airbags, fuel systems, or electrical components.
Long-term reliability can be a concern due to the complexity of the vehicle's systems and the potential for the aforementioned issues to arise with age and mileage. Regular maintenance and addressing problems promptly can help mitigate these risks, but potential buyers should be aware of the potential for higher repair costs compared to some competitors.
How long will the 2006 Cadillac STS last?
With good maintenance, a 2006 Cadillac STS can reasonably reach 200,000 miles or more. However, consistent maintenance is critical. Many are still on the road today, suggesting a lifespan of 15-20 years is achievable.
Long-term durability weaknesses primarily center around the Northstar V8's head gasket issues and electronic component failures. Suspension components, especially the Magnetic Ride Control, are also susceptible to wear and tear. Proper fluid changes, timely repairs, and careful driving habits can extend the vehicle's lifespan.
Long-term durability weaknesses primarily center around the Northstar V8's head gasket issues and electronic component failures. Suspension components, especially the Magnetic Ride Control, are also susceptible to wear and tear. Proper fluid changes, timely repairs, and careful driving habits can extend the vehicle's lifespan.
What Technology & Safety Features are Included?
The 2006 Cadillac STS came equipped with a variety of built-in tech and safety features for its time. Standard features included a Bose premium audio system, dual-zone automatic climate control, and leather upholstery. Higher trims and optional packages added features like a navigation system, heated and cooled front seats, a sunroof, and adaptive cruise control.
Driver-assistance features included available StabiliTrak electronic stability control, traction control, and rear parking sensors. Safety features comprised standard antilock brakes (ABS), front and side airbags, and a tire pressure monitoring system.
Optional features included Magnetic Ride Control (a real-time damping suspension system), adaptive headlights, and a head-up display. The navigation system was relatively advanced for its time, but lacks the modern features of current systems.
Crash-test ratings from the NHTSA (National Highway Traffic Safety Administration) and IIHS (Insurance Institute for Highway Safety) should be consulted for specific performance in frontal, side, and rollover crash tests. Generally, the STS performed well in crash tests, offering good occupant protection. Consult these agencies for exact scores for the 2006 model year.
Driver-assistance features included available StabiliTrak electronic stability control, traction control, and rear parking sensors. Safety features comprised standard antilock brakes (ABS), front and side airbags, and a tire pressure monitoring system.
Optional features included Magnetic Ride Control (a real-time damping suspension system), adaptive headlights, and a head-up display. The navigation system was relatively advanced for its time, but lacks the modern features of current systems.
Crash-test ratings from the NHTSA (National Highway Traffic Safety Administration) and IIHS (Insurance Institute for Highway Safety) should be consulted for specific performance in frontal, side, and rollover crash tests. Generally, the STS performed well in crash tests, offering good occupant protection. Consult these agencies for exact scores for the 2006 model year.
What Colors Options are Available?
Exterior Colors
Black Raven
Dark Tarnished Silver
Silver Silk
Stealth Gray
Radiant Bronze
Infrared
Interior Colors
Light Cashmere
Seville Leather Cashmere
Light Neutral
Seville Leather Light Neutral
Ebony
Seville Leather Ebony
2006 Cadillac STS Prices and Market Value
When new, the 2006 Cadillac STS had a starting price around $40,000, with higher trims reaching upwards of $50,000. Currently, used market prices typically range from $4,000 to $10,000, depending on condition, mileage, and trim level.
The STS has experienced significant depreciation due to its age, potential maintenance costs, and the availability of newer, more technologically advanced vehicles. Factors affecting resale value include the condition of the engine (especially regarding head gasket issues), overall mechanical condition, mileage, and the presence of desirable options like navigation and Magnetic Ride Control. Cars with documented maintenance history will command a higher price.
The STS has experienced significant depreciation due to its age, potential maintenance costs, and the availability of newer, more technologically advanced vehicles. Factors affecting resale value include the condition of the engine (especially regarding head gasket issues), overall mechanical condition, mileage, and the presence of desirable options like navigation and Magnetic Ride Control. Cars with documented maintenance history will command a higher price.
2006 Cadillac STS Cost of Ownership
The 2006 Cadillac STS is generally considered moderately costly to own. Insurance costs are average for a luxury sedan. Fuel costs can be high, especially with the V8 engine. Maintenance and repair costs can be significant, especially if the Northstar V8 requires head gasket work or the Magnetic Ride Control needs replacement. Long-term ownership costs should be factored in due to the car's age and potential for needing repairs on aging components. Regular preventative maintenance can help mitigate some of these expenses, but it is important to budget for potential repairs.
2006 Cadillac STS Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
17.00 gallons
City Mileage
16 miles/gallon
Highway Mileage
23 miles/gallon
2006 Cadillac STS Safety Rating
NHTSA
IIHS
2006 Cadillac STS Recalls & Defects
Vehicle Speed Control
Recall date
2006-01-13
Recall no.
06v007000
Source
NHTSA
Summary
ON Certain Passenger Vehicles Equipped With All Wheel Drive and A 3.6l V6 Engine, THE Torque Monitoring Functions OF THE Electronic Throttle Control (Etc) ARE NOT Enabled. These Functions CAN Limit Engine Speed and Torque IF Unusual Engine Control Module (Ecm) Hardware or Software Failures Occur.
Consequence
Without These Functions Enabled, A Persistent ECM Failure Could Result IN A Throttle Opening Greater Than Commanded BY THE Driver and A Crash Could Occur.
Remedy
Dealers Will Reprogram THE ECM ON These Vehicles Free OF Charge. THE Recall Began ON January 24, 2006. Owners MAY Contact Cadillac AT 1-866-982-2339.
Notes
GM Recall NO. 06502.customers MAY Also Contact THE National Highway Traffic Safety Administration's Vehicle Safety Hotline AT 1-888-327-4236 (Tty 1-800-424-9153), or GO TO Http://Www.safercar.gov.
Fuel System, Gasoline:delivery
Recall date
2006-01-25
Recall no.
06v020000
Source
NHTSA
Summary
Certain Vehicles Equipped With V6 Engines MAY Have A Condition Where Fuel IS NO Longer Supplied TO THE Engine. This Condition Occurs Without THE Illumination OF THE Fuel Level Low Indicator Light or THE Warning Chime.
Consequence
IF THE Engine Stops Running, THE Operator Will NOT BE Able TO Restart THE Vehicle Which Could Increase THE Risk OF A Crash.
Remedy
Dealers Will Reprogram THE Electronic Control Module (Ecm) With NEW Software Free OF Charge. Owners Were Notified IN December 2005 and Asked TO Maintain AT Least 1/4 OF A Tank Fuel Level TO Avoid This Condition Until THE Parts ARE Available. THE Parts ARE NOW Available, Owner Renotification Began ON March 23, 2006. Owners MAY Contact Cadillac AT 1-866-982-2339.
Notes
GM Recall NO. 05111.customers MAY Also Contact THE National Highway Traffic Safety Administration's Vehicle Safety Hotline AT 1-888-327-4236 (Tty 1-800-424-9153), or GO TO Http://Www.safercar.gov.
Power Train:axle Assembly:axle Shaft:seal
Recall date
2007-12-20
Recall no.
07v589000
Source
NHTSA
Summary
ON Certain Passenger Vehicles, THE Rear Axle Pinion Seal Does NOT Meet All OF THE Specifications and MAY Experience A Fluid Leak.
Consequence
A Rear Differential Failure MAY Cause Loss OF Motive Power and Possibly Loss OF Control Increasing THE Risk OF A Crash.
Remedy
Dealers Will Replace THE Pinion Seal Free OF Charge. THE Recall Began ON February 1, 2008. Owners MAY Contact Cadillac AT 1-800-458-8006 or Http://Www.cadillac.com; Pontiac AT 1-800-620-7668 or Http://www.pontiac.com; and Saturn AT 1-800-972-8876 or Http://www.saturn.com.
Notes
GM Recall NO. 07204.customers MAY Also Contact THE National Highway Traffic Safety Administration's Vehicle Safety Hotline AT 1-888-327-4236 (Tty 1-800-424-9153), or GO TO Http://Www.safercar.gov.
Fuel System, Gasoline:delivery:fuel Pump
Recall date
2014-09-09
Recall no.
14v542000
Source
NHTSA
Summary
General Motors LLC (Gm) IS Recalling Certain Model Year 2004-2007 Cadillac Cts-V Vehicles Manufactured October 6, 2003, TO March 15, 2007, and 2006-2007 Cadillac Sts-v Vehicles Manufactured June 23, 2005, TO March 15, 2007. IN THE Affected Vehicles, THE Electrical Terminals OF THE Fuel Pump Module MAY Overheat Resulting IN THE Melting OF THE Flange Material.
Consequence
IF THE Flange Melts, A Hole MAY BE Created Allowing THE Fuel Pump TO Leak Fuel, Causing THE Vehicle TO Stall, Increasing THE Risk OF A Vehicle Crash. Additionally, Leaking Fuel IN THE Presence OF AN Ignition Source Increases THE Risk OF A Fire.
Remedy
GM Will Notify Owners, and Dealers Will Replace THE Fuel Module and Fuel Tank Jumper Harness, Free OF Charge. GM Sent OUT Interim Notices IN Late October. THE Recall Began ON March 12, 2015. Owners MAY Contact Cadillac Customer Service AT 1-800-458-8006. Gm's Number FOR This Recall IS 14405.
Notes
Owners MAY Also Contact THE National Highway Traffic Safety Administration Vehicle Safety Hotline AT 1-888-327-4236 (Tty 1-800-424-9153), or GO TO Www.safercar.gov.
2006 Cadillac STS Warranty
Basic
Original warranty
48 months / 50,000 miles
Estimated remaining
Expired
Powertrain
Original warranty
48 months / 50,000 miles
Estimated remaining
Expired
Rust
Original warranty
72 months / 100,000 miles
Estimated remaining
Expired
2006 Cadillac STS Insurance
Insurance for a 2006 Cadillac STS is moderately priced, reflecting its status as a Sedan with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 2006 Cadillac STS Compare to Other Sedan?
The 2006 Cadillac STS competed against luxury sedans like the BMW 5 Series, Mercedes-Benz E-Class, Acura TL, and Lexus GS. In terms of performance, the STS with the Northstar V8 offered comparable acceleration to some rivals, but the BMW 5 Series generally provided sharper handling. Feature-wise, the STS was competitive, offering similar amenities to its competitors.
Reliability is where the STS falls somewhat short, as the Northstar V8 has a reputation for head gasket issues, while the German rivals tend to be more reliable overall (though also more expensive to repair when they do break). The Acura TL and Lexus GS are known for their strong reliability.
Price-wise, the STS can be found for less than its German rivals on the used market, making it an attractive option for budget-conscious buyers. Similar alternatives include the Lexus GS 300/350 for superior reliability, or the Acura TL for a sporty, reliable, and more affordable option. If performance is a priority and budget allows, a BMW 5 Series (though be aware of higher maintenance costs) is a better choice. Given reliability concerns, proceed with caution when considering an STS, carefully inspecting for signs of prior issues.
Reliability is where the STS falls somewhat short, as the Northstar V8 has a reputation for head gasket issues, while the German rivals tend to be more reliable overall (though also more expensive to repair when they do break). The Acura TL and Lexus GS are known for their strong reliability.
Price-wise, the STS can be found for less than its German rivals on the used market, making it an attractive option for budget-conscious buyers. Similar alternatives include the Lexus GS 300/350 for superior reliability, or the Acura TL for a sporty, reliable, and more affordable option. If performance is a priority and budget allows, a BMW 5 Series (though be aware of higher maintenance costs) is a better choice. Given reliability concerns, proceed with caution when considering an STS, carefully inspecting for signs of prior issues.
Ranks #1903 Sedan
| 1 | 2023 Toyota Camry | (5.0★) |
| 2 | 2023 Honda Accord | (0.0★) |
| 3 | 2023 Lexus ES | (0.0★) |
| 4 | 2024 Subaru Legacy | (5.0★) |
| 5 | 2022 Mazda MX-30 | (4.0★) |
| 6 | 2024 BMW M3 | (0.0★) |
| 7 | 2023 Ford Mustang | (5.0★) |
| 8 | 2023 Mercedes-Benz AMG GT | (0.0★) |
| 9 | 2023 Audi A3 | (0.0★) |
| 10 | 2023 Chevrolet Camaro | (5.0★) |
| 11 | 2023 Hyundai Elantra Hybrid | (0.0★) |
| 12 | 2023 Nissan Altima | (4.0★) |
| 1903 | 2006 Cadillac STS | (0.0★) |
Final Verdict: Is the 2006 Cadillac STS a Good Sedan?
The 2006 Cadillac STS is ideal for buyers seeking a stylish and relatively affordable luxury sedan with decent performance. It's worth buying if you're aware of its potential reliability issues and are willing to perform thorough inspections and maintenance. Purchasing a well-maintained example with a documented service history is crucial.
It's best to buy one used, as new models are no longer available. The V6 model might be a slightly more reliable choice than the V8, although the V8 offers a more engaging driving experience. Avoid models with obvious signs of neglect or deferred maintenance. Only consider buying if you can secure a pre-purchase inspection by a trusted mechanic familiar with Cadillac Northstar engines.
It's best to buy one used, as new models are no longer available. The V6 model might be a slightly more reliable choice than the V8, although the V8 offers a more engaging driving experience. Avoid models with obvious signs of neglect or deferred maintenance. Only consider buying if you can secure a pre-purchase inspection by a trusted mechanic familiar with Cadillac Northstar engines.
Simon A
Simon is a contributor to VinCheck, where he provides articles and reviews on various automotive topics. His work focuses on delivering accurate and up-to-date information about used cars, helping readers make informed decisions.