Diagnostics & troubleshooting
Truck and trailer fault diagnosis, ABS diagnostics, and DPF and emission system troubleshooting.

On the road. At your yard. Wherever you need us. Mobile diagnostics, repairs, and maintenance across the GTA and Central, Eastern, and Western Ontario.
From a warning light to a truck that won't start, get mobile support for your truck, trailer, or fleet.
Truck and trailer fault diagnosis, ABS diagnostics, and DPF and emission system troubleshooting.
Support for brake concerns and air system faults to identify the issue and plan the necessary repair.
Electrical troubleshooting, battery and charging system service, and starting system repairs.
Assessment and repair support for truck and trailer suspension issues at your location.
Mobile truck and trailer mechanical repairs and minor welding, based on the job and site conditions.
On-site maintenance support for fleet operators, owner-operators, and businesses that depend on their vehicles.
Explore repair visuals from the engine bay to the wheel end and trailer suspension. For your vehicle's needs, speak with our technician.



AI-generated illustrative repair images. These are not photographs of completed Fleet Doc jobs.

Fleet Doc Truck and Trailer Repair Inc. provides mobile repair and maintenance support for truck owners and fleet operators across the GTA and Central, Eastern, and Western Ontario.
With a 310T Truck & Coach Technician and mobile service, we bring repair support to your vehicle's location.
Tell us what happened and where you are. We'll discuss the next steps with you.
Call 647-562-1384 with your vehicle type, symptoms, warning lights, and current location.
We'll discuss the issue, confirm your location, and arrange mobile service based on availability.
On-site assessment helps identify the fault and determine the repair work your truck or trailer needs.
Mobile truck and trailer repair across the GTA, Central Ontario, Eastern Ontario, and Western Ontario. Call with your exact location to confirm travel availability and arrange a visit.
Check service availabilityToronto · Brampton · Mississauga · Vaughan · Markham · Richmond Hill · Oakville · Burlington · Milton · Pickering · Ajax · Whitby · Oshawa
Barrie · Orillia · Midland · Collingwood · Wasaga Beach · Huntsville · Bracebridge · Gravenhurst · Peterborough · Lindsay
Cobourg · Port Hope · Belleville · Trenton · Kingston · Brockville · Cornwall · Ottawa · Smiths Falls · Perth
Hamilton · Guelph · Kitchener · Waterloo · Cambridge · Brantford · Woodstock · Stratford · London · Sarnia · Chatham · Windsor
Nearby communities along Highway 401, 400, 404, 407, 416, 417, and the QEW. Call 647-562-1384 to confirm service for your location. Travel availability and arrival timing vary by distance and current workload.
For urgent service, call us directly. For maintenance and general enquiries, email us or prepare a service request below.
Yes. Fleet Doc is available 24/7. Call 647-562-1384 to discuss your needs and arrange service. Arrival timing depends on location and availability.
Yes. We provide mobile service for roadside, yard, and fleet locations across the GTA and Central, Eastern, and Western Ontario. Share your exact location when you call.
Your location, a callback number, vehicle make and model, symptoms, and any warning lights or fault codes. These details help us understand the job.
Call or email with your vehicle and repair details. An assessment may be needed to identify the fault and determine the work required.