Powertrain, generic (extended)

P2053 Reductant Injection Valve Circuit/Open (Bank 1 Unit 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2053 concerns a second DEF injector on the same exhaust line as Bank 1, unit 1, used where a manufacturer doses at two points, for instance ahead of two separate catalysts. GM's 2025 table (25OBDG04B, which also covers an inline-six diesel) monitors this DEF metering valve 2 with the same open-load logic as valve 1: more than 11 V, 30 faulty samples out of 60 at 100 ms, Type A; a separate P1C30 checks its coil temperature after a long soak. Deutz's EMR5 engines assign P2053 to metering unit 2, with failure bytes for current above normal (grounded) and below normal (open). If valve 2 drops out, valve 1 keeps working, so the downstream catalyst simply loses its DEF and NOx rises only partly, often noticed just through the MIL.

Likely causes

Disconnected or corroded plug at DEF injector 2
Broken wire between control module and injector 2
Open coil in injector 2

Symptoms

  • MIL on
  • Slightly higher NOx, little noticeable otherwise
  • DEF system message

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

Related codes

P2054P2055P2047P2056

References: gsi.ext.gm.com, serdia.deutz.com, law.cornell.edu.