Powertrain
generic / SAE
P2D1C
Cold Start EGR A/B Ratio Performance
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberD / 1C
Possible causes
- One EGR valve sluggish at cold high
- Carbon-clogged passages on one channel medium
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 300–1800 €
- Estimated time: 1.5–6 h
- Component: egr valve a
- Component: egr valve b
- Component: ecm
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012