Powertrain, generic (extended)

P20F7 Reductant Injection Valve Stuck Open (Bank 2 Unit 1)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Crystals or debris on the bank 2 valve seat
Mechanically sticking or heat-damaged bank 2 dosing valve
Leaking or detached supply line at the bank 2 valve

Symptoms

  • Check engine light and DEF warning
  • Higher DEF consumption and deposits in the bank 2 exhaust
  • Dosing switched off and later inducement

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–900
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

reductant injection valve

Related codes

P20F6P208FP2050P201AP20F5

References: patents.google.com, law.cornell.edu, static.nhtsa.gov.