Kenworth truck repair & roadside — mobile diesel mechanics
Kenworth is PACCAR's other premium Class 8 line (T680, T880, W990). It shares the PACCAR MX-13 and the Cummins X15 with Peterbilt, so its common faults and roadside diagnostics are nearly identical — aftertreatment and electrical first, mechanical second.
Send one request — nearby diesel techs see your truck and fault info before they quote you.
Common Kenworth problems & roadside issues
- PACCAR MX aftertreatment faults (DPF, DEF dosing, SCR efficiency)
- DEF quality / NOx-sensor faults driving SCR inducement
- EGR cooler and EGR valve faults on the MX-13
- J1939 datalink and chassis electrical faults from corroded connectors
- Cooling and air-system faults that trip engine-protection derates
Kenworth engines
Pick your engine for engine-specific common faults and fault-code help.
The PACCAR MX-13 in the Kenworth T680/T880 is the same 12.9L inline-six used across Peterbilt and DAF. Aftertreatment and EGR faults make up most of its roadside calls; the long block itself is durable.
Cummins X15 15.0LThe Cummins X15 is the 15L option in Kenworth's heavy lineup, popular with owner-operators who want the broad Cummins service footprint. Aftertreatment and EGR systems drive most fault codes.
Throwing a fault code?
Look up what a heavy-duty SPN/FMI code means — DPF, DEF/SCR, engine protection, oil pressure, and more — then get a mechanic dispatched. Open the fault-code lookup ›
FAQ
Yes — most Kenworth roadside calls are aftertreatment (DPF/DEF/SCR), electrical, air-system, or EGR faults that a mobile diesel tech can diagnose and often resolve on-site with a scan tool. Severe internal failures or a fully plugged DPF need a shop.
The most common Kenworth roadside issues are: PACCAR MX aftertreatment faults (DPF, DEF dosing, SCR efficiency); DEF quality / NOx-sensor faults driving SCR inducement; EGR cooler and EGR valve faults on the MX-13.
Kenworth trucks are commonly spec'd with PACCAR MX-13, Cummins X15. Pick your engine below for engine-specific fault-code help.
Find a Kenworth mechanic near you
General repair guidance for heavy-duty diesel trucks. Not a substitute for a scan-tool diagnosis on your specific Kenworth.