Vehicle Software and Diagnostics Tool Test Engineer - PACCAR

Date: Aug 7, 2026

Location: Mount Vernon, WA, US, 98273-9671

Company: PACCAR

The Vehicle Software and Diagnostic Test Engineer plays a key role in driving the quality and performance of PACCAR’s DAVIE4 Service Tool—the powerhouse behind deploying and updating vehicle software and delivering diagnostics for Kenworth and Peterbilt trucks. In this fast‑paced role, you’ll jump into in‑vehicle testing, tackle complex technical challenges, and collaborate across PACCAR divisions to troubleshoot issues and keep development moving forward. You’ll also help elevate our test benches by integrating new hardware and enhancing automation scripts, ensuring our tools stay sharp, efficient, and ready for what’s next.

Company Information

PACCAR is a Fortune 500 company established in 1905. PACCAR Inc is recognized as a global leader in the commercial vehicle, financial, and customer service fields with internationally recognized brands such as Kenworth, Peterbilt, and DAF trucks. PACCAR is a global technology leader in the design, manufacture and customer support of high-quality light-, medium- and heavy-duty trucks under the Kenworth, Peterbilt and DAF nameplates. PACCAR designs and manufactures advanced diesel engines and also provides customized financial services, information technology and truck parts related to its principal business. Whether you want to design the transportation technology of tomorrow, support the staff functions of a dynamic, international leader, or build our excellent products and services — you can develop the career you desire with PACCAR. Get started!

Division Information

The PACCAR Technical Center provides engineering excellence to the truck and engine divisions of PACCAR Inc through innovative product development and testing. The Technical Center is located in the Skagit Valley about 65 miles north of Seattle, Washington.

Job Functions / Responsibilities

• Perform vehicle and engine diagnostic software testing using both test benches and in‑vehicle setups
• Plan, coordinate, and execute small to moderate‑scope projects with minimal supervision
• Ensure all functionality is validated through comprehensive, executable test cases
• Recommend the most effective test method (bench or in‑vehicle) based on engineering judgment and system capabilities
• Validate defect fixes for closure and provide stakeholders with clear assessments of customer impact
• Foster strong communication and maintain productive working relationships across teams

Qualifications

• 0-2 years of engineering experience
• Foundational understanding of software testing principles and test methodologies
• Familiarity with Controller Area Network (CAN) protocols, especially J1939
• Ability to interpret simple to moderately complex electrical systems and schematics