AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 2004 Peterbilt 379
Overall rating NHTSA-grounded
Average
Estimated 5-year repair + maintenance cost: $15,000–$25,000
The 2004 Peterbilt 379 has a moderate recall history, with issues related to brakes and engine cooling. Owner complaints are rare, indicating relatively stable performance. However, the recalls suggest areas of potential concern, particularly around engine and air braking systems.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| engine valve actuation | 100,000–150,000 miles | $500–$1,500 | occasional |
| air brake hose | 60,000–100,000 miles | $100–$300 | occasional |
| engine control system | 80,000–120,000 miles | $300–$700 | rare |
Scheduled maintenance to budget
Routine items every owner should plan for.
- Oil and filter change every 15,000 miles
- Air filter replacement every 30,000 miles
- Brake system inspection annually
- Coolant system flush every 60,000 miles
- Engine valve adjustment every 100,000 miles
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- Engine losing power unexpectedly
- Air brakes not engaging properly
- Unintended engine starts
Generated by gpt-4o on 6/14/2026. Cost ranges are conservative estimates that account for typical regional variation.