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Diesel Truck Mechanic Shops in Ottawa, ON

Find trusted diesel truck mechanic services in Ottawa. Compare prices, read reviews, and book online.

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Simard Diesel Repairs Inc.
Ottawa • ≈ 2 km
SI
Simard Diesel Repairs Inc.
336 Entrepreneur Crescent, Navan, ON K4B 1T8, Ottawa
★ 5.0
4 Google reviews
Response ≈ 58 min • $$ • Quotes free
Diesel Truck Mechanic Fuel System
📞 (613) 227-3627 • Free quote • Verified
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Brar Truck & Trailer Mobile Service
Ottawa • ≈ 7 km
BR
Brar Truck & Trailer Mobile Service
2775 Moodie Dr., Ottawa, ON K2J 4S6, Canada, Ottawa
★ 4.8
38 Google reviews
Response ≈ 39 min • $$ • Quotes free
Diesel Truck Mechanic Truck & Heavy DutyTruck Mechanic
📞 (437) 799-9068 • Free quote • Verified
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Mobile Mechanic
Ottawa • ≈ 3 km
MO
Mobile Mechanic
4140 Ramsayville Rd, Ottawa, ON K1G 3N4, Ottawa
★ 4.5
67 Google reviews
Response ≈ 52 min • $$ • Quotes free
Diesel Truck Mechanic Truck Mechanic
📞 (613) 360-3646 • Free quote • Verified
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Ottawa Truck And Trailer Repair
Ottawa • ≈ 4 km
OT
Ottawa Truck And Trailer Repair
320 Entrepreneur Crescent, Carlsbad Springs, ON K0A 1K0, Ottawa
★ 4.5
24 Google reviews
Response ≈ 40 min • $$$ • Quotes free
Diesel Truck Mechanic Truck MechanicTruck & Heavy Duty
📞 (613) 666-6887 • Free quote • Verified
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Ed's Truck Service
Ottawa • ≈ 2 km
ED
Ed's Truck Service
35 Bentley Ave, Ottawa, ON K2E 6T6, Canada, Ottawa
★ 3.7
46 Google reviews
Response ≈ 56 min • $$$ • Quotes free
Diesel Truck Mechanic Truck & Heavy DutyTruck Mechanic
📞 (613) 226-3081 • Free quote • Verified
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GSM truck & trailer repair
Ottawa • ≈ 3 km
GS
GSM truck & trailer repair
3199 Hawthorne Rd, Ottawa, ON K1G 3N2, Canada, Ottawa
★ 3.7
3 Google reviews
Response ≈ 43 min • $$ • Quotes free
Diesel Truck Mechanic Truck & Heavy DutyTruck Mechanic
📞 (613) 360-6603 • Free quote • Verified
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Just Dynafix Mobile Truck and Trailer Repair
Ottawa • ≈ 4 km
JU
Just Dynafix Mobile Truck and Trailer Repair
800 Ottawa 34, Ottawa, ON K1K 2V7, Ottawa
★ 1.0
2 Google reviews
Response ≈ 53 min • $$$ • Quotes free
Diesel Truck Mechanic Truck & Heavy DutyTruck Mechanic
📞 (800) 994-3962 • Free quote • Verified
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Verified Reviews for Diesel Truck Mechanic
★★★★★

“Booked at lunch. Quote came back in 34 minutes with a real breakdown, not a guess. Dropped off the Civic, got SMS updates, picked it up same day. Zero phone tag.”

Jordan B. • Diesel Truck Mechanic at Simard Diesel Repairs Inc., Ottawa
★★★★★

“Finally a Ottawa shop that actually does diagnostics properly. Boommar showed verified reviews only — made the decision easy.”

Amelia S. • Diagnostics at Brar Truck & Trailer Mobile Service
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Find a Best Diesel Truck Mechanic in Ottawa, ON

Ottawa's regional construction activity, government fleet operations, and the heavy trucks serving the agricultural and resource industries of the surrounding Ottawa Valley create a steady demand for diesel mechanics with experience in cold-climate operations, where cold-start challenges, DPF management in sustained low-temperature idling, and emission system performance are daily considerations.

Common Diesel Truck Issues

Contaminated diesel fuel or clogged fuel filters restricting flow
Failing fuel injectors or high-pressure fuel pumps (HPFP) losing rail pressure
Clogged EGR valves and cracked EGR coolers causing overheating and coolant loss
Turbocharger bearing failure, sticking variable-geometry vanes, or boost leaks
Glow plug or intake heater malfunctions preventing cold-weather starting
Diesel Particulate Filter (DPF) clogging from excessive idling or short trips

When to Book a Diesel Mechanic

Hard starting or extended cranking, especially in cold weather
Excessive black smoke (rich running), white smoke (coolant leak), or blue smoke (oil burning) from the exhaust
Distinct metallic "knocking" or "clatter" sound indicating injector or bearing failure
Check Engine light, Water in Fuel warning, or emission system derate mode
Significantly reduced towing power, turbo lag, or sluggish acceleration
Frequent forced DPF regeneration cycles or "Exhaust Filter Full" warnings on the dash

Diesel Truck Mechanic Services Available

Diesel Fuel System Repair

Injector replacement, high-pressure fuel pump rebuilds, and rail pressure testing

Turbocharger Diagnostics & Replacement

Boost leak testing, VGT actuator repair, and full turbo replacement

EGR/DPF/DEF Emission System Service

EGR cooler replacement, DPF cleaning/baking, and DEF injector diagnostics

Glow Plug & Cold Start Service

Testing, extraction of seized glow plugs, and intake heater repair

Diesel Engine Diagnostics

Factory-level scanning for Cummins, Duramax, Power Stroke, and Detroit engines

Diesel Performance Tuning

ECM calibration, exhaust upgrades, and intake system optimization

Diesel Truck Mechanic Tips

Always purchase diesel fuel from high-volume, reputable stations to minimize contamination risk
Drain the water separator at every oil change and immediately if the Water in Fuel light illuminates
Use a high-quality winter anti-gel additive when temperatures consistently drop below -15°C
Avoid excessive idling—it prevents the DPF from reaching regeneration temperature and causes clogging
Let the turbo cool down by idling for 30-60 seconds before shutting off the engine after heavy towing
Follow the severe-duty oil change interval if you tow, haul, or drive in extreme temperatures regularly

Frequently Asked Questions

Are diesel truck repairs more expensive than gas engine repairs in Ottawa? +
Generally, yes. Diesel engines operate at much higher pressures and tolerances than gasoline engines. Components like fuel injectors ($300-$600 each), high-pressure fuel pumps ($1,500-$3,000), and turbochargers ($1,500-$3,500) are significantly more expensive. Diesel-specific diagnostic tools and specialized labor also contribute to higher repair costs.
How much does a diesel fuel injector replacement cost in Ottawa? +
A single diesel injector replacement costs $500-$1,000 including parts and labor. Replacing all injectors on a common 6-cylinder diesel (Cummins 6.7L, Duramax 6.6L, or Power Stroke 6.7L) typically runs $3,000-$6,000+. It's often recommended to replace all injectors at once to avoid repeat labor costs.
What does it mean when my diesel truck goes into derate or limp mode? +
Derate mode is the engine's ECM intentionally reducing power to protect itself from further damage, usually triggered by emission system faults (DPF, DEF, EGR), overheating, or low oil pressure. You should drive only to the nearest safe repair facility at reduced speed. Ignoring derate can lead to a complete engine shutdown.
How often should I service my diesel truck's DPF system? +
Most diesel DPF systems require a professional cleaning (ash removal) every 150,000-300,000 km, depending on driving conditions. Trucks driven primarily in city stop-and-go traffic or at idle may need it sooner. A DPF cleaning costs $300-$600 and is far cheaper than a replacement filter ($2,000-$5,000+).

Diesel Truck Mechanic in Nearby Cities

Toronto Mississauga Brampton Hamilton London Markham Vaughan Kitchener

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