OBD-II code · Powertrain (generic, extended)
P26FC EGR Cooler Bypass Control Stuck Closed Bank 2
The EGR cooler bypass valve on bank 2 is stuck in the closed position. EGR gas always passes through the cooler, slowing engine warm-up and degrading cold-start emissions.
Is it safe to drive with P26FC?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyValve flap seized closed by soot
- PossibleActuator linkage jammed in closed position
- Less likelyCarbon or debris buildup preventing free movement
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
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–5.5 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Cooler Bypass Valve B2, Bypass Actuator
Related codes
- P26FBEGR Cooler Bypass Control Stuck Closed Bank 1
- P26F9Coolant Pump C Control Module Overtemperature
- P26FACoolant Pump C Overspeed/Air in System
- P26FDA/C Compressor Internal Control Module Performance
- P26FEExhaust Flow Control Valve A Control Performance
- P26FFAuto Configuration Throttle Input Not Present Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.