Boommar. Find Mechanics
Add Listing
BOOMMAR / ON / Grimsby / Diesel Truck Mechanic

Diesel Truck Mechanic Shops in Grimsby, ON

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

✓ Verified Shops ✓ Online Booking ✓ Real Reviews
Apex mobile fleet&Reefer repair
Grimsby • ≈ 6 km
AP
Apex mobile fleet&Reefer repair
384 Lake St, Grimsby, ON L3M 1Z9, Canada, Grimsby
★ 5.0
3 Google reviews
Response ≈ 59 min • $$$ • Quotes free
Diesel Truck Mechanic Truck & Heavy DutyTruck Mechanic
📞 (905) 921-2771 • Free quote • Verified
View Profile
Maynard's Automotive
Grimsby • ≈ 6 km
MA
Maynard's Automotive
241 S Service Rd unit #4, Grimsby, ON L3M 1Y6, Canada, Grimsby
★ 4.9
97 Google reviews
Response ≈ 21 min • $$ • Quotes free
Diesel Truck Mechanic Exhaust SystemOil Change & Lube
📞 (905) 945-1700 • Free quote • Verified
View Profile
Mountain Automotive & Repairs
Grimsby • ≈ 2 km
MO
Mountain Automotive & Repairs
122 Mountain Rd, Grimsby, ON L3M 4E7, Canada, Grimsby
★ 4.9
86 Google reviews
Response ≈ 52 min • $$ • Quotes free
Diesel Truck Mechanic Auto Cooling SystemTires & Wheels
📞 (905) 309-5007 • Free quote • Verified
View Profile
Clausen's Automotive Repair and Service
Grimsby • ≈ 9 km
CL
Clausen's Automotive Repair and Service
50 Main St E, Grimsby, ON L3M 1N1, Canada, Grimsby
★ 4.8
74 Google reviews
Response ≈ 37 min • $$$ • Quotes free
Diesel Truck Mechanic Rust Proofing & ProtectionTires & Wheels
📞 (905) 945-2823 • Free quote • Verified
View Profile
Stevens Auto Electric & Machine
Grimsby • ≈ 10 km
ST
Stevens Auto Electric & Machine
591 Main St W, Grimsby, ON L3M 1V1, Canada, Grimsby
★ 4.8
54 Google reviews
Response ≈ 33 min • $ • Quotes free
Diesel Truck Mechanic Auto MechanicEngine Repair
📞 (905) 643-3965 • Free quote • Verified
View Profile
Showing 5 mechanics • Load more
Online booking workflow

Grimsby bookings,
zero phone tag.

STEP 01
Search

Filter Grimsby shops by service, rating, distance, open now.

5 results • verified
STEP 02
Request Booking

Send vehicle + service details. Get a firm quote or pick a slot.

Avg reply 42m
STEP 03
Shop Approves

Owner confirms time, price, and bay availability. One tap.

Calendar & SMS sync
STEP 04
Appointment Confirmed

You get confirm + reminders + live status tracking.

Stripe receipts
Grimsby customer reviews

Real bookings, real reviews

Verified Reviews for Diesel Truck Mechanic
★ ★ ★ ★ ★

“Fair prices and excellent service”

Arsh Uppal • Diesel Truck Mechanic at Apex mobile fleet&Reefer repair, Grimsby
★ ★ ★ ★ ★

“I brought my wife’s SUV here to have the brakes looked at, and this is as honest of mechanic as you can find. He advised me that the rear brakes did not need to be replaced, and when my wife took her vehicle to Midas in Mississauga almost a year earlier they advised her that she needed to replace all the brakes and we’re going to charge over $1200. I would highly recommend this local mechanic.”

David Capan • Diesel Truck Mechanic at Clausen's Automotive Repair and Service, Grimsby
★ ★ ★ ★ ★

“Great service, communicated as required regarding any issues, fair pricing.”

Joe D'AMELIO • Diesel Truck Mechanic at Mountain Automotive & Repairs, Grimsby
★ ★ ★ ★ ★

“Most honest and dependable repair facility I have ever taken my cars to. Maynard, Jordan and George do a great job.”

Bob Coady • Diesel Truck Mechanic at Maynard's Automotive, Grimsby
For shop owners

Get More Customers
Through Boommar

Grimsby drivers searched “auto mechanic” 8,400 times last month. Claim your listing, turn searches into bookings.

• Online Booking
• Lead Tracking
• Review Management
• Listing Analytics
Claim Your Listing View Grimsby pricing
Grimsby Pro – last 30 days
+41
booking requests
4.8★
avg rating
31m
median reply
92%
show-up rate
Calendar sync • Stripe • SMS reminders • Review automation

Find a Best Diesel Truck Mechanic in Grimsby, ON

Don't leave your Diesel Truck Mechanic to chance. Browse 5 trusted mechanics in Grimsby, read authentic customer reviews, and find the right shop for your vehicle today.

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 Grimsby? +
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 Grimsby? +
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 Ottawa Mississauga Brampton Hamilton London Markham Vaughan

Other Services in Grimsby

Auto Mechanic Truck Mechanic Oil Change & Lube Brake Services Tires & Wheels Auto Detailing Auto Body & Paint Windshield & Glass

Popular Cities

Toronto Vancouver Calgary Edmonton Ottawa Winnipeg