Mack truck repair & roadside — mobile diesel mechanics
Mack Trucks (Anthem, Pinnacle, Granite) is the vocational and line-haul sibling of Volvo under the Volvo Group. Mack runs its own MP-series engines (MP7, MP8) — closely related to Volvo's D11/D13 — usually behind the Mack mDRIVE automated transmission. Aftertreatment, EGR, and mDRIVE faults lead its roadside calls.
Send one request — nearby diesel techs see your truck and fault info before they quote you.
Common Mack problems & roadside issues
- MP-series aftertreatment faults (DPF regen, DEF dosing, SCR efficiency)
- DEF quality / NOx-sensor faults that stage SCR inducement
- EGR cooler and VGT turbocharger faults
- mDRIVE transmission and clutch-actuator faults
- Coolant-temperature and oil-pressure engine-protection derates
Mack engines
Pick your engine for engine-specific common faults and fault-code help.
The Mack MP7 is an 11L inline-six (closely related to the Volvo D11) for regional, vocational, and weight-sensitive work. It shares the Volvo Group aftertreatment and controls, so DPF/DEF/SCR codes dominate its roadside diagnostics.
Mack MP8 13.0LThe Mack MP8 is the 13L line-haul and heavy-vocational engine (related to the Volvo D13) in the Anthem and Pinnacle. The aftertreatment system is its single biggest source of roadside derates.
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 Mack 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 Mack roadside issues are: MP-series aftertreatment faults (DPF regen, DEF dosing, SCR efficiency); DEF quality / NOx-sensor faults that stage SCR inducement; EGR cooler and VGT turbocharger faults.
Mack trucks are commonly spec'd with Mack MP7, Mack MP8. Pick your engine below for engine-specific fault-code help.
Find a Mack mechanic near you
General repair guidance for heavy-duty diesel trucks. Not a substitute for a scan-tool diagnosis on your specific Mack.