Diesel Engine Aftertreatment Performance Engineer Jobs

Select how often (in days) to receive an alert:

Date: Sep 3, 2026

Company: PACCAR

PACCAR Global Powertrain organization is seeking a motivated Associate System Performance Verification Engineer to support testing, verification, and system integration activities for PACCAR’s advanced engine aftertreatment systems. This position is located at PACCAR Technical Center, Mount Vernon, WA.

• Assist with defining and executing verification, and testing activities to support engine aftertreatment development in vehicle and in the test cell environment
• Support Collaboration with Engine Integration, OBD calibration and Vehicle Integration teams to successfully integrate aftertreatment functions
• Recommend, develop, and execute continuous process improvement to improve product quality, reliability, and durability of the PACCAR engine aftertreatment system
• Help with completing reports and presentations to communicate findings, draw conclusions and give recommendations on the next steps
• Stay aware of new and upcoming aftertreatment technologies and testing methods
• Maintain a positive working relationship with other groups at the PACCAR Technical Center and other PACCAR divisions

• B.S. in Engineering (Electrical, Computer, Mechanical), Computer Science, or related discipline (MS preferred)
• Understanding of heavy-duty diesel emissions regulatory requirements including diagnostics
• Understanding of current diesel exhaust aftertreatment technology (DOC, DPF, SCR & DEF)
• Knowledge of engine control system strategies and how they pertain to diesel engine and aftertreatment systems
• Scripting and data analysis experience using MATLAB, Python or Minitab desired
• Experience with engine test cell/vehicle data collection, analysis and test planning is preferred
• Experience with engine calibration, data collection tools (ATI Vision/Vector Canape, Cummins Calterm/ETAS INCA & Vector CANalyzer) and engine control systems
• Must be self-directed; possess excellent analysis, communication, and presentation skills; must be organized and take a rigorous approach to engineering projects
• Ability to work well independently and as part of a team
• Must be able to manage personal workload and have the willingness, flexibility, and initiative to respond to shifting time and project demands
• Ability to travel up to 15%, including international travel

PACCAR, Inc. is a Fortune 500 company established in 1905 and is recognized as a global leader in the commercial vehicle, financial, and customer service fields. PACCAR is a global technology leader in the design, manufacture, and customer support of high-quality light-, medium- and heavy-duty trucks.

• 401k with up to a 5% company match
• Fully funded pension plan that provides monthly benefits after retirement
• Comprehensive PTO – minimum of 10 paid vacation days (additional days are provided with additional seniority/years of service), 12 paid holidays, and sick time
• Tuition reimbursement for continued education
• Medical, dental, and vision plans for you and your family
• Flexible spending account (FSA) and health account (HSA)
• Paid short-and-long-term disability programs
• Life and accidental death and dismemberment insurance
• EAP services include wellness plans, estate planning, financial counseling and more

PACCAR is an Equal Opportunity Employer/Protected Veteran/Disability. At PACCAR, we value talent and promote growth and development. We carefully consider numerous compensation factors, including your education, training, or experience. Applicants and employees for this position will not be sponsored for work authorization, including, but not limited to H-1B visas, now or in the future. The salary range for the Associate System Performance Verification Engineer is $70,500 - $105,800 annually. Additionally, this role is eligible for a full range of benefit options listed above. This position is also eligible for a holiday gift.

#LI-DT1

Job Segment: Computer Science, Systems Engineer, Data Analyst, Business Process, Technology, Engineering, Data, Management, Automotive