Peterbiltrepair & diagnostics
Peterbilt — from the 389 and 579 to vocational 567 chassis — runs PACCAR MX-13 and Cummins engines. We handle Peterbilt aftertreatment, air systems, and foundation brakes across all four shops.
Shop & mobile service for Peterbilt
Connect the right laptop, pull active and inactive codes, and read live data before recommending parts.
Forced (parked) regens, SCR/DEF dosing faults, NOx sensor diagnosis, and derate clearing.
Slack adjusters, chambers, relay valves, drums, linings, and ABS blink-code reading.
Alternators, batteries, parasitic draws, 7-way, and crank/no-start diagnosis.
Air ride ride height, air bags, leveling valves, and walking-beam service.
Preventative maintenance A/B/C and annual DOT inspections that leave you compliant.
Commercial tire sales, mounting, balancing, wheel seals, bearings, and hubs.
Lights, brakes, suspension, landing gear, doors, and reefer refrigeration troubleshooting.
The faults we see most
DPF soot overload, regen aborts, and NOx sensor issues on the MX platform.
Air dryer purge valves, gladhand seals, and compressor unloaders draining tanks overnight.
Slack adjusters out of stroke, drum and lining wear — the #1 DOT violation.
Peterbilt engine platforms
We connect the right diagnostic laptop for each engine platform Peterbilt runs, pull the fault codes, and read live data before recommending a single part. Below are the engines we service on Peterbilt.
Read the diagnostic path
MTG Shops does not perform engine overhauls or major component rebuilds in-house. We have quality partners in every market who specialize in Peterbilt overhauls and in-frame / out-of-frame rebuilds. We handle the diagnosis, get the truck to the right specialist, and coordinate the handoff. You get an honest answer about what we fix and what goes to a trusted partner.
Get a bay time and a straight estimate.