Powertrain
generic / SAE
P23E6
EGR C Control Stuck Closed
Same as P23E5 with valve C stuck closed - no EGR through this stage; NOx emissions rise. EGR mixes inert exhaust into intake to lower combustion peak temperature — too little raises NOx, too much causes misfires and rough running.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / E6
Possible causes
- Valve stuck closed high
- Carbon or debris buildup preventing free movement low
- Component wear with age - mechanical play low
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 300–1500 €
- Estimated time: 1.5–5 h
- Component: egr valve c
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012