Powertrain, generic (extended)

P2052 Reductant Injection Valve Circuit High (Bank 2 Unit 1)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2052 tells that battery potential is present on the switched line of the first Bank 2 injector, for example through a short to a powered wire or moisture bridging connector pins. It belongs to twin-bank SCR layouts in which each cylinder bank owns an injector; publicly, no manufacturer documents this code or its thresholds. For the matching Bank 1 code P2049, GM's 2014 Cruze diesel uses Type B (two trips) and the Deutz EMR5 list describes voltage above normal or a short to the high source, so P2052 would presumably follow the same logic. A driver that sees a short to positive normally switches off to protect itself, leaving the second branch without DEF. CARB's comprehensive-component rules apply; check plug, harness and coil resistance first.

Likely causes

Control line of the Bank 2 injector touching a supply wire
Moisture bridging pins in the Bank 2 injector plug
Faulty output stage for the Bank 2 valve

Symptoms

  • MIL on, possibly after two trips
  • No DEF on Bank 2
  • Higher tailpipe NOx

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

P2050P2051P2049P2058

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