OBD-II code · Powertrain (generic, extended)
P23E5 EGR C Control Stuck Open
EGR valve C is stuck in the open position - exhaust gas continuously dilutes intake air, reducing power and risking misfires at idle.
Is it safe to drive with P23E5?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyValve stuck open
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–5 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Valve C
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.