You call around. “Sorry, we don’t work on those.” Call the next place. Same answer, maybe with an apology this time. Call a third and you might get a yes, if you can wait three weeks and don’t mind driving forty-five minutes each way.
If you’ve got a diesel, you already know this. I’ve had guys roll into my lot annoyed before we’ve even popped the hood, and it’s never at us. It’s at the four shops before us who wouldn’t touch it.
We work on diesels. We’ve been doing it for decades, we’ve got the equipment for it, and honestly it’s one of the things I actually like about this business, because most shops around here just opted out of learning it.
Adam and Mark handle diagnosis on anything diesel that comes through the door. Between the two of them, they’ve been doing this since before I owned the place, and they’re the kind of guys who’ll tell you a part is fine even when it’d be an easy sale to replace it. That matters more with diesel than with a regular car, because these systems, the fuel systems, the turbos, the emissions and DEF stuff, all the electronics layered on top, will let you throw parts at a problem for months without ever fixing it, if that’s the road you want to go down. Adam and Mark don’t let you go down that road.
Our DeKalb shop is set up for the bigger stuff. Heavier lifts, bays that actually fit a work truck, guys who see diesels every week instead of once a month when one wanders in. If you’re hauling equipment, running a fleet, or just driving a pickup that happens to be diesel, that’s the shop you want.
The IDOT Safety Lane
One thing most people don’t know until they need it: we’re the only IDOT Safety Lane in DeKalb County. Cody runs it, every day, mostly for fleet guys and truck owners who need their vehicles on the road to make a living. It’s not flashy, but if you’ve ever had to drive out of the county to get this done, you already know exactly why it matters that you don’t have to anymore.
Maintenance is the boring part nobody wants to talk about, but it’s the part that actually saves you money. Oil, fuel filters, the cooling system, whatever your manufacturer says to do and when. Do that and you mostly avoid the expensive stuff. Skip it and you find out the hard way, usually at the worst possible time. My goal with any diesel customer isn’t to fix your truck after it dies on you. It’s to get you to a point where that doesn’t happen in the first place.
For a lot of you, the truck isn’t just a truck. It’s the job. When it’s down, everything tied to it is down too, whatever job site or delivery or appointment was depending on that truck showing up. We get that, and it’s part of why we try to explain what’s actually wrong instead of just handing you a bill and a list of parts.
What Actually Goes Wrong on a Diesel
Most of what we see falls into a handful of buckets, and it’s worth knowing them so you’re not caught off guard.
Fuel system issues are probably the most common, and usually the most expensive if they’re ignored. Bad fuel, water in the tank, a clogged filter, an injector starting to go. Diesel fuel systems run at much higher pressure than a gas engine, so a small problem doesn’t stay small for long. Catch it early and it’s a filter and an afternoon. Ignore it and you’re looking at injector or pump work, which isn’t cheap on any diesel.
DEF and emissions systems are the newer headache. Diesel exhaust fluid systems, the sensors that watch them, the regen cycles that clean out the particulate filter, all of it adds complexity that older diesels never had. When one of these throws a code, a shop that doesn’t know diesels will either guess or just tell you no. We don’t guess.
Turbo problems show up as a loss of power, unusual noise, or smoke that wasn’t there before. Sometimes it’s the turbo itself, sometimes it’s something feeding it, like a boost leak or a failing sensor telling the engine the wrong thing. Diagnosing which one it actually is, instead of just replacing the turbo and hoping, is where having guys who’ve done this for years pays off.
And then there’s the basic stuff that just matters more on a diesel: batteries (these engines need serious cranking power, especially cold), cooling system health, and the transmission if you’re towing or hauling regularly. None of it is exotic. It just needs someone who actually pays attention to it.
Questions We Get a Lot
People ask if we’ll work on an older diesel, or if we only want the newer trucks. Bring it in. We work across the age range, from older mechanical-injection trucks to the newest emissions-heavy stuff. Older doesn’t mean simpler, and it doesn’t mean we’re not interested.
A lot of guys ask whether it’s even worth fixing an older diesel, or if they should just replace the truck. Depends on the truck and the problem. Diesels are generally built to run a long time, longer than most gas engines, so a lot of what looks like a big decision is actually a pretty easy one once you know what’s actually wrong.
And some people aren’t even sure if what they’re dealing with is diesel-specific or just a regular vehicle issue. You don’t have to know that going in. Bring it in, tell us what it’s doing, and we’ll figure out whether it’s tied to the diesel systems or something any shop could handle.
More Than Just Diesel Service
We do plenty of non-diesel work too:
- Steering and suspension repairs
- Brake service
- Tire sales and service
- Alignments
- Fleet maintenance
- DOT inspections
But honestly, most people who come in for the diesel work end up staying for everything else. I think that’s because once we’ve earned the trust on the hard stuff, the easy stuff is a pretty easy decision.
Diesel and bigger-truck work goes through our DeKalb location. If you’re not sure whether we handle your specific truck or repair, just call and ask.
Ready when you are
Diesel and larger-truck service is handled at our DeKalb location.
Book online → Schedule your service online
Or give us a call:
DeKalb: 112 Industrial Dr. | 815-754-4200
About the Author
Jon Bockman has owned Bockman’s Auto, Truck and Tire since 1999, continuing what his father Charlie started in DeKalb County in 1964. Named NAPA Shop of the Year and voted Best Auto Repair in the Daily Chronicle Readers’ Choice 16 times. Two locations, 24 employees, and one goal: give people an honest answer about what their vehicle actually needs.