P20F7Reductant Injection Valve Stuck Open (Bank 2 Unit 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P20F7 is the bank 2 version of P20F6 and only applies to engines with a second exhaust line that has its own SCR catalyst and dosing valve, typically V engines with separate aftertreatment per bank. The control unit judges that this valve no longer closes, usually because pressure cannot be held or the pump must deliver far more than the commanded dose. No maker documents P20F7 publicly; on the bank 1 side FCA uses P20F6 on the 2.0 L diesel Jeep Compass and cures it with software. A Cummins patent explains the underlying comparison of pump effort and expected flow, where a large negative error means a stuck-open valve or a leak. CARB requires reductant delivery faults to be detected before emissions exceed the limits. Overdosing on one bank causes ammonia slip and deposits there. The stuck-closed code for bank 2 is P208F.
- What you may notice
- Check engine light and DEF warning
- Higher DEF consumption and deposits in the bank 2 exhaust
- Dosing switched off and later inducement
- Likely causes
- LikelyCrystals or debris on the bank 2 valve seat
- PossibleMechanically sticking or heat-damaged bank 2 dosing valve
- RareLeaking or detached supply line at the bank 2 valve
- 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: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.