Powertrain, generic (extended)

P202E Reductant Injection Valve Circuit Range/Performance (Bank 1 Unit 1)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P202E concerns the first DEF dosing valve on bank 1, which in most SCR systems is the only one. The circuit itself is intact, but the valve does not behave as commanded. GM's 6.6 L LML (2014 table) checks what the valve driver was told to do against the actual state of its circuit and sets a Type A code after more than ten mismatches within 80 injections, checked only with the coil between about −7 and 100 °C. In GM's 2018 diesel tables an active stuck-tip fault of the valve also blocks the SCR efficiency test P20EE. Chrysler reflashed the dosing control unit of 2013–2014 Ram 2500 to 5500 with 6.7 L Cummins against needless P202E (bulletin 18-010-14), and Hino traced some cases on 2013 J08 trucks to software misjudging DEF pressure. Real faults are crystal-stuck valves or bad contacts; too little DEF raises NOx.

Likely causes

Dosing valve sticking from urea crystals or a clogged tip
Dosing or engine control unit software (updates available on some models)
Corroded valve connector or harness
DEF pressure at the valve outside the expected range

Symptoms

  • Malfunction indicator lamp on
  • DEF system warning, possibly countdown to speed limitation
  • Possibly additional SCR efficiency codes

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–900
Time0.3–3 h

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

Parts involved

reductant injection valvereductant metering unit

Related codes

P201AP2047P208EP204FP20EE

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.