Code result
P049B
EGR B Flow Insufficient Detected
Moderate severity
What it means
Same as P049A but specifically with measured flow below the required rate - typically EGR valve sticking closed or cooler heavily clogged.
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
EGR valve B sticking closed
highOne of the most commonly reported causes for this code — check this first.
EGR cooler B heavily clogged with soot
mediumA plausible cause — test and verify before replacing parts.
Related help
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