Code result
P2457
EGR Cooler Performance
Moderate severity
What it means
The EGR cooler does not lower exhaust gas temperature as expected — typically internal coolant fouling, a partial blockage, or a cracked cooler that mixes coolant with exhaust gas.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Cooler internally clogged with soot
highOne of the most commonly reported causes for this code — check this first.
Cooler cracked, coolant entering exhaust
mediumA plausible cause — test and verify before replacing parts.
Related help
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