Powertrain, generic (extended)

P2EAF Reductant Injection Valve Stuck Closed Bank 1 Unit 2

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2EAF means the second DEF injector on bank 1 stays shut although it is commanded open, so the SCR stage it serves gets no reductant. It is the unit 2 counterpart of P208E. Control units spot the case in two ways. One looks at the coil current: when the armature lifts, the trace shows a small kink, and Delphi's patent US11280245 describes finding it even with chopped drive voltage. The other compares pump effort with the commanded flow; in Cummins' patent US9664092 a shortfall of 90 % or more stands for a stuck-closed injector or a blocked line. No manufacturer documents P2EAF publicly; GM's LZ0 files a stuck second injector under P2EAE instead. Usually crystallised fluid or corrosion holds the needle. NOx emissions rise and the vehicle may later limit speed.

Likely causes

Needle held by crystallised DEF
Corrosion inside the injector after poor fluid or long standstill
Blocked or frozen supply line to the second injector

Symptoms

  • Check engine lamp on
  • DEF warning with countdown to speed limitation
  • Higher NOx emissions

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–900
Time0.5–3 h

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

Parts involved

reductant injection valve b1 u2

Related codes

P208EP2EAEP2EADP2053

References: patents.google.com, patents.google.com, gsi.ext.gm.com, law.cornell.edu.