Peterbilt Repair & Maintenance Guide
Founded 1939 · Denton, Texas, USA
Brand origin: United States. Origin does not determine factory location or parts compatibility.
Browse Peterbilt models and years →Peterbilt, a PACCAR subsidiary, builds premium Class 8 trucks favored by owner-operators. The Model 579 is the company's flagship on-highway tractor; the 567 dominates the vocational market.
Popular Peterbilt models
Common Peterbilt problems
PACCAR MX-13 EGR/aftertreatment faults
Similar to other modern diesels: NOx sensors and DEF dosing units are the leading derate triggers.
Cab air suspension leaks
Air bags and lines under the cab develop leaks that cause sag and rough ride.
Bendix ABS modulator faults
Yellow ABS warning light, often traced to wheel-speed sensor connectors.
Peterbilt maintenance tips
- Greasing the fifth wheel and steer axle every 10,000 miles is non-negotiable on linehaul trucks.
- Inspect drag link and tie rod ends quarterly — Peterbilt steer-axle wear is a common DOT inspection failure.
Frequently asked questions
Is the PACCAR MX-13 reliable?
The MX-13 has good top-end durability but is sensitive to oil cleanliness. Stick to PACCAR-approved CK-4 oil and 30,000-mile drain intervals.
Peterbilt 579 vs Freightliner Cascadia?
The Cascadia leads in fuel economy and parts availability; the 579 is preferred for resale value and ride quality.