AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 2021 Peterbilt 579
Overall rating NHTSA-grounded
Average
Estimated 5-year repair + maintenance cost: $10,000–$15,000
The 2021 Peterbilt 579 has a moderate rate of recalls, especially concerning the braking system and electrical components, but only minimal owner complaints. While critical issues such as brake and transmission recalls necessitate attention, the absence of high complaint volume supports a balanced reliability outlook.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| brake system | 50,000–80,000 miles | $1,500–$3,000 | common |
| fuel tank assembly | 30,000–60,000 miles | $1,000–$2,000 | common |
| transmission linkage | 40,000–70,000 miles | $500–$1,500 | occasional |
| alternator | 60,000–90,000 miles | $400–$800 | occasional |
Scheduled maintenance to budget
Routine items every owner should plan for.
- Oil and filter change every 15,000 miles
- Brake inspection and service every 30,000 miles
- Transmission fluid replacement every 60,000 miles
- Coolant system check every 45,000 miles
- Air filter change every 30,000 miles
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- Unusual braking noises
- Transmission hesitation
- Fuel odors near tank
- Electrical shorts or glitches
Generated by gpt-4o on 6/12/2026. Cost ranges are conservative estimates that account for typical regional variation.