2012 Mercedes-Benz Alliado

The 2012 Mercedes-Benz C-Class is a popular luxury sedan, coupe, and wagon known for its blend of performance, comfort, and style. Engine options vary depending on the specific model, but a common choice is the C250 with its 1.8L turbocharged inline-4 engine producing around 201 horsepower and 229 lb-ft of torque. Other engine options available for the 2012 C-Class include the C300, which had a 3.0L V6 and the C350, which featured a 3.5L V6. The C63 AMG was also available with a 6.2L V8 engine. Most models came with a 7-speed automatic transmission. Owners often praise the C-Class for its refined driving experience and luxurious interior. Common complaints include higher maintenance costs and potential electrical issues.

Engine

1.8L Turbocharged Inline-4 (C250)

• High-Pressure Fuel Pump Failure
  • Description/Symptoms: Engine stalling, difficulty starting, check engine light.
  • Solution: Replace the high-pressure fuel pump.
  • Estimated Cost to Fix: $800 - $1200+
  • Recalls: None Found
• Camshaft Adjuster Solenoid Issues
  • Description/Symptoms: Rough idle, decreased fuel efficiency, check engine light.
  • Solution: Replace the faulty camshaft adjuster solenoid.
  • Estimated Cost to Fix: $300 - $500+
  • Recalls: None Found

3.5L V6 (C350)

• Camshaft Adjuster Failure
  • Description/Symptoms: Rough idle, decreased fuel efficiency, check engine light.
  • Solution: Replace the faulty camshaft adjuster solenoid.
  • Estimated Cost to Fix: $1200 - $2500+
  • Recalls: None Found

Transmission

7G-Tronic (7-Speed Automatic)

• Torque Converter Issues
  • Description/Symptoms: Shuddering during acceleration, harsh shifting, slipping between gears.
  • Solution: Torque converter replacement.
  • Estimated Cost to Fix: $2500 - $4500+
  • Recalls: None Found
• Valve Body Problems
  • Description/Symptoms: Erratic shifting, delayed engagement, transmission stuck in gear.
  • Solution: Valve body replacement or repair.
  • Estimated Cost to Fix: $1500 - $3000+
  • Recalls: None Found

Suspension

• Air Suspension Failure (If Equipped)
  • Description/Symptoms: Vehicle sagging on one side, rough ride, air compressor running constantly.
  • Solution: Replace the faulty air strut or air compressor.
  • Estimated Cost to Fix: $1000 - $2000+ per strut, $800 - $1500+ for the compressor.
  • Recalls: None Found

Electrical

• Electronic Steering Lock (ESL) Failure
  • Description/Symptoms: Key not recognized, unable to start the vehicle, steering wheel locked.
  • Solution: Replace the ESL unit.
  • Estimated Cost to Fix: $800 - $1500+
  • Recalls: None Found
• EIS/EZS (Electronic Ignition Switch) Malfunction
  • Description/Symptoms: Key not recognized, inability to start the vehicle, dashboard lights not illuminating.
  • Solution: Replace the EIS/EZS unit.
  • Estimated Cost to Fix: $1000 - $2000+
  • Recalls: None Found
• SAM (Signal Acquisition Module) Issues
  • Description/Symptoms: Various electrical malfunctions, including lighting problems, power window issues, and sensor failures.
  • Solution: Replace the faulty SAM unit.
  • Estimated Cost to Fix: $800 - $1800+
  • Recalls: None Found

Exterior

• Panorama Sunroof Issues (If Equipped)
  • Description/Symptoms: Rattling noises, difficulty opening or closing, water leaks.
  • Solution: Repair or replace sunroof components.
  • Estimated Cost to Fix: $500 - $2000+
  • Recalls: None Found

Interior

• Cracked Dashboard
  • Description/Symptoms: Cracking of the dashboard material, especially in warmer climates.
  • Solution: Dashboard replacement or repair.
  • Estimated Cost to Fix: $800 - $2500+

Summary:

The 2012 Mercedes-Benz C-Class, while generally a reliable luxury vehicle, can experience several common issues. Engine and transmission problems, particularly related to the 7G-Tronic transmission and the high-pressure fuel pump for the 1.8L engine, can be costly to repair. Electrical problems with the ESL, EIS/EZS, and SAM modules are also prevalent and can lead to significant expenses. Suspension issues, especially with the optional air suspension, can add to the maintenance burden. While some issues are relatively minor, others can be quite severe and expensive to fix, potentially costing several thousand dollars.