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.
Find listed providers near you, then tell them your truck and fault info when you call.
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 find a mechanic near you. 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.