Diesel Truck Mechanic Shops in Mississauga, ON

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

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Mr Diesel Inc
Verified Verified
Mississauga • ≈ 7 km
MR
5900 Dixie Rd, Mississauga
Response ≈ 32 min $$ • Quotes free
Diesel Truck Mechanic Windshield & GlassEngine Repair
📞 9056777663 Free quote • Verified
AS Diesel truck and trailer repair
Mississauga • ≈ 9 km
AS
1715 Sismet Rd, Mississauga, ON L4W 2K8, Canada, Mississauga
★ 5.0
10 Google reviews
Response ≈ 39 min $$$ • Quotes free
Diesel Truck Mechanic
📞 (647) 671-4904 Free quote • Verified
T Diesel Mobile Mechanic Mississauga
Mississauga • ≈ 3 km
T
Third St, Mississauga, ON L5G 4J5, Mississauga
★ 5.0
5 Google reviews
Response ≈ 24 min $$$ • Quotes free
Diesel Truck Mechanic
📞 (416) 825-6429 Free quote • Verified
Unique Diesel Repair Centre
Mississauga • ≈ 6 km
UN
1715 Britannia Rd E #12, Mississauga, ON L4W 2A3, Canada, Mississauga
★ 5.0
4 Google reviews
Response ≈ 42 min $ • Quotes free
Diesel Truck Mechanic
📞 (416) 669-8072 Free quote • Verified
Diesel Repair Hub
Mississauga • ≈ 3 km
DI
7517 Bren Rd Unit 19&20, Mississauga, ON L4T 3V4, Canada, Mississauga
★ 4.8
28 Google reviews
Response ≈ 42 min $$$ • Quotes free
Diesel Truck Mechanic
📞 (905) 790-1221 Free quote • Verified
Hi-End Diesel Truck & Trailer Repair
Mississauga • ≈ 10 km
HI
1123 Lorimar Dr, Mississauga, ON L5S 1M5, Mississauga
★ 4.8
63 Google reviews
Response ≈ 56 min $ • Quotes free
Diesel Truck Mechanic
📞 (905) 793-0000 Free quote • Verified
west coast diesel repair
Mississauga • ≈ 6 km
WE
1905 Shawson Dr, Mississauga, ON L4W 1T9, Canada, Mississauga
★ 4.8
33 Google reviews
Response ≈ 25 min $$$ • Quotes free
Diesel Truck Mechanic
📞 (647) 961-4810 Free quote • Verified
Super Tech Truck Repair
Mississauga • ≈ 6 km
SU
6439 Netherhart Rd, Mississauga, ON L5T 1C3, Mississauga
★ 4.4
59 Google reviews
Response ≈ 23 min $$$ • Quotes free
Diesel Truck Mechanic Truck & Heavy DutyTruck Mechanic
📞 (647) 870-3476 Free quote • Verified
House of Diesel
Mississauga • ≈ 3 km
HO
1850 Britannia Rd E Unit -7, Mississauga, ON L4W 1J3, Canada, Mississauga
★ 4.2
62 Google reviews
Response ≈ 34 min $$$ • Quotes free
Diesel Truck Mechanic
📞 (437) 228-7000 Free quote • Verified
Diesel Truck Centre
Mississauga • ≈ 8 km
DI
2677 Drew Rd, Mississauga, ON L4T 3X1, Mississauga
★ 3.6
52 Google reviews
Response ≈ 25 min $$$ • Quotes free
Diesel Truck Mechanic
📞 (905) 908-1995 Free quote • Verified
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Verified Reviews for Diesel Truck Mechanic
★ ★ ★ ★ ★

“Bhatti and Gopi are both the most honest and hardworking mechanics. They take well care of my trucks. And advise me for future repairs to make trucks reliable on road.”

Jaskaran Mangat • Diesel Truck Mechanic at AS Diesel truck and trailer repair, Mississauga
★ ★ ★ ★ ★

“I had an amazing experience with West Coast Diesel Repair in Mississauga. I initially went to Volvo Vision Truck, where I was quoted around $5,000 for three issues related to the ECU, brake system, and cruise control. They also told me upfront that the radar needed a full upgrade and couldn’t be repaired, which was a big part of that cost.
To be sure, I even visited a few other repair shops - but no one was able to properly diagnose the problems, let alone fix them.
Then I came across West Coast Diesel Repair, and the difference was night and day.
A special shoutout to Deep - his expertise is outstanding. He was able to accurately diagnose and resolve all three issues, including fixing the radar that others said couldn’t be repaired, within just 4 hours, and at a very reasonable cost. What really stood out to me is that they use genuine diagnostic software, which clearly makes a huge difference in identifying the root cause instead of guessing.
Honest, knowledgeable, and efficient service. Highly recommend this place if you want your truck diagnosed and fixed the right way the first time!”

akash bhardwaj • Diesel Truck Mechanic at west coast diesel repair, Mississauga
★ ★ ★ ★ ★

“Great service very experienced mechanics and very reasonable price highly recommended excellent customer service, clear communication, great job guys keep it up”

Ravinder Pal • Diesel Truck Mechanic at AS Diesel truck and trailer repair, Mississauga
★ ★ ★ ★ ★

“Danny is a great guy, he has saved me a few times. Great mechanic, far and honest. Would highly recommend his business House of Diesel.”

Guy Wonch • Diesel Truck Mechanic at House of Diesel, Mississauga
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Find a Best Diesel Truck Mechanic in Mississauga, ON

Boommar lists 11 verified mechanics in Mississauga. Compare real reviews, response times, pricing bands, and open bays — then book online.

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 Mississauga? +
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 Mississauga? +
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+).