Powertrain, generic (extended)

P2057 Reductant Injection Valve Circuit Low (Bank 2 Unit 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2057 is the short-to-ground case for the second DEF injector of Bank 2. As with P2056 and P2058, it exists in the code list for engines with two exhaust banks and two dosing points each, yet no manufacturer publishes a calibration or service bulletin for it. Analogous logic is documented for Bank 1: GM's 2025 diesel table flags a low-side ground short at metering valve 2 (P2054) after 30 out of 60 samples, Type A, and the Deutz EMR5 list describes failure type 11 for that position. Likely culprits are a harness clamped against the frame or an exhaust bracket, shorted coil windings and DEF residue in the connector. Because the output stage switches the valve off, its catalyst segment converts noticeably less NOx.

Likely causes

Harness clamped against frame or exhaust bracket
Shorted windings in the injector coil
DEF residue in the connector

Symptoms

  • MIL on
  • Valve switched off, NOx conversion reduced

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

P2056P2058P2054P2051

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