P26FCEGR Cooler Bypass Control Stuck Closed (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P26FC is the bank 2 version of P26FB and only exists on engines with a separate EGR cooler and bypass for each cylinder bank, typically V-configuration diesels. The engine module has commanded the bypass of the second bank open, but position feedback or the resulting gas temperature shows it is still closed, so the exhaust gas keeps flowing through the cooler during warm-up. No manufacturer documents P26FC in public. For bank 1, FCA's STAR case S2018000001 on the 3.0 L EcoDiesel shows how such a fault arises: a clogged orifice in the vacuum line to the actuator, or a flap that does not move freely. CARB requires the EGR cooler bypass to be checked for proper response while cold-start emission strategies are active. If P26FB and P26FC appear together, a shared vacuum supply or solenoid is the likely cause.
- What you may notice
- Check engine light on
- Slower warm-up of the exhaust aftertreatment
- Likely causes
- LikelyBlocked, leaking or kinked vacuum line to the bank 2 actuator
- PossibleBypass flap of bank 2 sticking from soot deposits
- PossibleFaulty actuator or control solenoid
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.