EGR Cooler Bypass Control Circuit Open Bank 1
The EGR cooler bypass valve on bank 1 - routes EGR around the cooler during cold-start to keep cabin and engine warm-up fast - has an open control circuit.
Affected components
- Egr cooler bypass valve b1
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
Related codes
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.