Code result
P2D1C
Cold Start EGR A/B Ratio Performance
High severity
What it means
During cold start, the ratio between EGR channel A and B flow does not match the calibrated cold-start strategy. One channel responds slower or sticks at low temperature.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
One EGR valve sluggish at cold
highOne of the most commonly reported causes for this code — check this first.
Carbon-clogged passages on one channel
mediumA plausible cause — test and verify before replacing parts.
Related help
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