2003 Chrysler 300M

2003 Chrysler 300M

Overview

The 2003 Chrysler 300M, a front-wheel-drive sedan, was known for its distinctive styling and comfortable interior. It offered a blend of American luxury and European-inspired handling, making it a compelling option in its segment. While generally considered a reliable vehicle for its era, like any car, it has specific areas that owners have reported issues with over time. This analysis focuses on common technical reliability concerns, excluding routine maintenance and standard wear and tear, to provide a clear picture of potential mechanical and electrical challenges.

---

Engine

3.5L V6 (High Output)

Intake Manifold Gasket Leaks

• Symptoms: Coolant leaks, engine overheating, rough idle, sweet smell from engine bay.
• Solution: Replacement of the intake manifold gaskets.
• Cost: $300 - $600

Oil Cooler Line Leaks

• Symptoms: Oil in coolant, coolant loss, potential engine damage if not addressed.
• Solution: Replacement of the oil cooler lines.
• Cost: $250 - $500

Transmission

4-Speed Automatic (42LE)

Harsh Shifting / Slipping

• Symptoms: Delayed engagement, rough shifts between gears, slipping sensation.
• Solution: Transmission fluid and filter change, potential internal repairs or rebuild.
• Cost: $400 - $1500+

Suspension

Standard Chassis

Worn Control Arm Bushings

• Symptoms: Clunking noises over bumps, vague steering feel, uneven tire wear.
• Solution: Replacement of control arm bushings or entire control arms.
• Cost: $300 - $700

Strut Mount Bearing Failure

• Symptoms: Popping or creaking noises when turning the steering wheel, especially at low speeds.
• Solution: Replacement of strut mount bearings.
• Cost: $200 - $450

Electrical

Body Control Module (BCM)

Intermittent Electrical Gremlins

• Symptoms: Malfunctioning power windows, door locks, interior lights, or dashboard warning lights.
• Solution: Diagnosis and potential reprogramming or replacement of the BCM.
• Cost: $500 - $1200

Alternator

Premature Failure

• Symptoms: Dimming headlights, battery warning light, difficulty starting the engine.
• Solution: Replacement of the alternator.
• Cost: $400 - $700

Exterior

Standard Body

Clear Coat Peeling

• Symptoms: Fading paint, peeling clear coat, especially on the roof and hood.
• Solution: Repainting affected areas.
• Cost: $500 - $2000+

Interior

HVAC System

Blend Door Actuator Failure

• Symptoms: Inability to control temperature or airflow direction.
• Solution: Replacement of the blend door actuator.
• Cost: $200 - $500

Power Seat Motors

Failure

• Symptoms: Power seats become inoperable or move erratically.
• Solution: Replacement of the power seat motor(s).
• Cost: $300 - $600

---

Summary Verdict

The 2003 Chrysler 300M is a capable sedan with a generally decent reliability record, but it is not without its potential issues. Owners should be aware of common problems such as intake manifold gasket leaks and oil cooler line leaks in the 3.5L V6 engine. The 4-speed automatic transmission can sometimes exhibit harsh shifting. Electrical issues, particularly related to the Body Control Module and alternator, are also noted. Suspension components like control arm bushings and strut mounts may require attention over time. Exterior paint degradation and interior HVAC blend door actuator failures are also reported. Despite these potential drawbacks, many 300Ms have provided reliable service with proper maintenance and timely repairs.