OBD-II code · Powertrain (generic, extended)
P23E8 EGR C Flow Excessive Detected
Same as P049C on EGR loop C. EGR mixes inert exhaust into intake to lower combustion peak temperature — too little raises NOx, too much causes misfires and rough running.
Is it safe to drive with P23E8?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyEGR valve C sticking open
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
Related codes
- P049CEGR B Flow Excessive Detected
- P23E5EGR C Control Stuck Open
- P23E6EGR C Control Stuck Closed
- P23E7EGR C Flow Insufficient Detected
- P23E9Camshaft A Position Signal Output Circuit Open Bank 2
- P23EACamshaft A Position Signal Output Circuit Low Bank 2
- P23EBCamshaft A Position Signal Output Circuit High Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.