2003 Jeep TJ

The 2003 Jeep TJ is a beloved off-road vehicle known for its simplicity, ruggedness, and open-air driving experience. Engine options included a 2.4L inline-4 producing 147 horsepower and 165 lb-ft of torque, and a more popular 4.0L inline-6 generating 190 horsepower and 235 lb-ft of torque. Transmission choices were a 5-speed manual and a 3-speed automatic. Owners appreciate the TJ’s off-road capability, customizable nature, and classic Jeep styling. Some common complaints include a rough ride, limited cargo space, and dated interior.

Engine

2.4L Inline-4

• Cracked Exhaust Manifold
  • Description/Symptoms: Ticking noise from the engine, especially when cold. Exhaust leak detectable near the manifold. Can cause a check engine light (CEL).
  • Solution: Replacement of the exhaust manifold.
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found

4.0L Inline-6

• Oil Leaks (Rear Main Seal)
  • Description/Symptoms: Oil dripping from the bell housing area of the transmission. Oil spots under the vehicle.
  • Solution: Replacement of the rear main seal.
  • Estimated Cost to Fix: $300 - $600+
  • Recalls: None Found
• Crankshaft Position Sensor Failure
  • Description/Symptoms: Engine stalling, especially when hot. Intermittent starting problems. CEL illuminated.
  • Solution: Replacement of the crankshaft position sensor.
  • Estimated Cost to Fix: $100 - $250+
  • Recalls: None Found

Transmission

NSG370 6-Speed Manual (Rare - Available Late in the Year) No Issues Found

NV3550 5-Speed Manual

• Synchro Wear
  • Description/Symptoms: Grinding when shifting into specific gears (often 2nd or 3rd). Difficulty engaging the gear.
  • Solution: Transmission rebuild or replacement, focusing on synchro replacement.
  • Estimated Cost to Fix: $1500 - $3000+
  • Recalls: None Found

32RH 3-Speed Automatic

• Torque Converter Failure
  • Description/Symptoms: Shuddering or slipping at low speeds. Poor acceleration. Possible CEL illumination.
  • Solution: Replacement of the torque converter and fluid flush.
  • Estimated Cost to Fix: $500 - $1000+
  • Recalls: None Found

Suspension

• “Death Wobble”
  • Description/Symptoms: Violent shaking of the front end, usually at highway speeds after hitting a bump.
  • Solution: Diagnose and replace worn steering components (tie rod ends, ball joints, track bar, steering stabilizer). Ensuring proper alignment.
  • Estimated Cost to Fix: $300 - $1000+ (depending on which components need replacement)
  • Recalls: None Found
• Sagging Springs
  • Description/Symptoms: Vehicle sits lower than normal, especially in the rear. Reduced ride quality and off-road performance.
  • Solution: Replacement of the coil springs.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found

Electrical

• Grounding Issues
  • Description/Symptoms: Erratic gauge behavior, flickering lights, difficulty starting, parasitic battery drain.
  • Solution: Clean and tighten all ground connections throughout the vehicle. Inspect and replace corroded wiring.
  • Estimated Cost to Fix: $100 - $500+ (depending on the severity and location of the issue)
  • Recalls: None Found
• Clock Spring Failure
  • Description/Symptoms: Airbag light illumination. Horn malfunction. Cruise control inoperative.
  • Solution: Replacement of the clock spring.
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found

Exterior

• Rust (Frame)
  • Description/Symptoms: Visible rust on the frame, especially in areas prone to moisture and salt exposure. Can lead to structural weakening.
  • Solution: Thorough inspection and treatment of surface rust. Frame repair or replacement for severe cases.
  • Estimated Cost to Fix: $100 (for surface treatment) to $2000+ (for frame repair or replacement)
  • Recalls: None Found

Interior

• HVAC Blend Door Actuator Failure
  • Description/Symptoms: Inability to control air temperature properly (e.g., only blowing hot or cold air). Clicking noise behind the dashboard.
  • Solution: Replacement of the blend door actuator.
  • Estimated Cost to Fix: $150 - $400+
  • Recalls: None Found

Summary The 2003 Jeep TJ, while generally reliable, has some common issues owners should be aware of. Engine oil leaks and crankshaft position sensor failure are prevalent with the 4.0L inline-6, while cracked exhaust manifolds are common with the 2.4L inline-4. Suspension issues, particularly the “death wobble”, can be dangerous and require prompt attention. Electrical gremlins, especially grounding issues, can be frustrating to diagnose. Rust, particularly on the frame, is a significant concern in regions with harsh winters. The severity and cost of repairs vary widely, but addressing these issues promptly can prevent further damage and ensure the long-term reliability of the vehicle.