EGR C Control Circuit Open
A general open-circuit fault on the third EGR valve C control - typically a third EGR loop in heavy-duty engines or specific Euro-7 systems.
Affected components
- Egr valve c
Common causes
- High likelihood: Open in valve or wiring
- Low likelihood: Pin pushed back out of connector body
- Low likelihood: Cracked solder joint inside the module or sensor
Possible symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.