Your engine is the most expensive system on your truck, and the one that costs you the most when it fails on the road. At Polstar Truck Repairs we diagnose and repair heavy duty diesel engines for owner-operators and fleets across the Greater Toronto Area, from a check-engine light to a complete rebuild.
Every job starts with a proper diagnosis. We connect to the engine's computer, read the active and stored fault codes, and then confirm the cause with hands-on testing instead of replacing parts by guesswork. That means you pay for the repair your truck actually needs.
Our technicians work on all major truck brands. Before any work starts, you get a clear explanation of what we found and what it will cost, and you approve it first.
Don't wait for a breakdown. Bring your truck in if you notice any of these:
A warning light or derate mode means the engine computer has logged a fault. Get it read before it turns into a breakdown.
Struggling on hills or slow acceleration under load often points to turbo, fuel or air intake problems.
Black, white or blue exhaust smoke is a sign of fuel, coolant or oil burning where it shouldn't.
Rising temperature gauges can quickly damage the head and gaskets. Stop and get it checked.
Topping up more often than usual, or puddles under the truck, means something is leaking or burning.
Knocking, ticking or whining sounds from the engine bay should be diagnosed early.
We work on trucks from all over Ontario, plus long-haul trucks from across Canada and the US passing through the GTA. Bring your truck to our Mississauga shop for engine repair.
Most diagnostics are completed the same day. We read the fault codes, test the related components and explain what we found before any repair work begins.
Yes. Our technicians work on all major heavy duty truck brands and engine makes. Call us with your truck's make and model if you want to confirm before bringing it in.
If the light is flashing, the truck has gone into derate, or you notice smoke, overheating or knocking, stop driving and call us. Driving on a serious fault can turn a small repair into major engine damage.
It depends on the engine's condition, mileage and the value of the truck. After inspecting it, we'll explain the options and costs so you can make the right decision for your business.
