Powertrain, generic (extended)

P2058 Reductant Injection Valve Circuit High (Bank 2 Unit 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2058 indicates that the second DEF injector on Bank 2 sees battery voltage on its switched line. Like the other Bank 2, unit 2 codes it is reserved for twin-bank engines with two dosing points per bank, and no manufacturer documents it publicly. The Bank 1 counterpart P2055 appears in GM's 2025 diesel table as a power short of metering valve 2 (Type A after 30 of 60 samples), while Ford's 2023 summary uses that number for a coil resistance more than 2 ohm too high, a reminder that meanings can shift between makers. CARB's comprehensive-component rules require such circuit checks. Moisture in the plug, a short to a neighbouring supply wire or a failed output stage are the usual suspects; dosing at that point stops.

Likely causes

Moisture in the injector plug
Short to a neighbouring supply wire
Failed output stage in the control module

Symptoms

  • MIL on
  • No dosing at the Bank 2 second valve

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

P2056P2057P2055P2052

References: law.cornell.edu, gsi.ext.gm.com, fordservicecontent.com.