EGR Valve & Cooler Repair
White smoke at startup and coolant that disappears without a visible leak is the classic sign of a cracked EGR cooler letting coolant cross into the exhaust. We pressure-test the cooling system to confirm it before anything comes apart.
Symptoms we see
| Symptom | Likely cause | What we do |
|---|---|---|
| White smoke at startup, especially cold mornings | Coolant crossing into the exhaust through a cracked EGR cooler | Pressure-test the cooling system to isolate the cooler before replacing it |
| Coolant level dropping with no visible external leak | An internal EGR cooler crack sending coolant into the exhaust instead of onto the ground | Pressure test and inspect — this is the first thing we rule in or out |
| Power loss and poor MPG, EGR-related fault codes | Soot buildup narrowing EGR passages, or a valve sticking partly open or closed | Clean the passages and free or replace the valve depending on condition |
| EGR valve stuck, rough idle or hesitation | Carbon and soot buildup preventing the valve from seating or opening fully | Clean or replace the valve — condition determines which |
SymptomWhite smoke at startup, especially cold mornings
Likely causeCoolant crossing into the exhaust through a cracked EGR cooler
What we doPressure-test the cooling system to isolate the cooler before replacing it
SymptomCoolant level dropping with no visible external leak
Likely causeAn internal EGR cooler crack sending coolant into the exhaust instead of onto the ground
What we doPressure test and inspect — this is the first thing we rule in or out
SymptomPower loss and poor MPG, EGR-related fault codes
Likely causeSoot buildup narrowing EGR passages, or a valve sticking partly open or closed
What we doClean the passages and free or replace the valve depending on condition
SymptomEGR valve stuck, rough idle or hesitation
Likely causeCarbon and soot buildup preventing the valve from seating or opening fully
What we doClean or replace the valve — condition determines which
What the job involves
We pressure-test the cooling system first to confirm whether coolant is actually crossing into the exhaust through the EGR cooler, rather than assuming it from the smoke alone.
If the cooler is confirmed cracked, we replace it and bleed the cooling system properly before the truck goes back out.
Valve sticking from soot buildup is a separate problem from a cracked cooler — we clean or replace the valve based on its actual condition.
Because the EGR cooler sits deep in the engine, replacing it usually means other hoses and gaskets in the same area come off too — we inspect those while we’re in there.
What drives the cost
What this costs depends on whether it’s the valve, the cooler, or both, how much of the surrounding cooling system has to come apart to get to it, and whether soot buildup can be cleaned or the passages need replacement parts. We tell you after we look at it, before we start.
Platforms
- Cummins X15
- EGR cooler cracking is a well-documented issue on this platform — usually the first thing we check on a white-smoke complaint.
- Detroit DD15
- EGR issues on this platform are typically diagnosed alongside the OneBox aftertreatment system rather than in isolation.
- Volvo D13 / Mack MP8
- EGR valve sticking is a known issue on this shared architecture, separate from the cooler itself.
- International A26
- EGR cooler cracking is specifically documented on the A26 — the same failure pattern we check for on other platforms, confirmed here too.
Common questions
How do you know it’s the EGR cooler and not a head gasket?
We pressure-test the cooling system first — that isolates whether coolant is going into the exhaust through the EGR cooler or somewhere else entirely.
Is white smoke always the EGR cooler?
It's the most common cause on these platforms, but we confirm it before replacing anything — a pressure test tells us for certain.
Can the EGR valve be cleaned instead of replaced?
Often, yes, if it’s just soot buildup and the valve itself isn’t damaged. We check condition before deciding.
What happens if I keep driving with a cracked EGR cooler?
You keep losing coolant, and eventually you'll overheat or trip a derate. It's worth pulling in before that happens.
What does an EGR cooler replacement cost?
Depends on the platform and how much has to come off to get to it. We give you a real number after we've looked at it, not before.
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Service area
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Call now or send a quote request — we’ll tell you what it takes to fix it.