EGR Cooler Bypass Control Circuit Driver Current/Temperature Too High Bank 1
The output driver for the EGR cooler bypass actuator on bank 1 reports current or junction temperature above its protection threshold. Stalled actuator or short to ground.
Affected components
- Egr cooler bypass actuator b1
- Ecm
Common causes
- High likelihood: Bypass actuator mechanically jammed
- Medium likelihood: Control wire shorted to ground
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
- Reduced-power or limp mode may occur
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.