Powertrain, generic (extended)

P2055 Reductant Injection Valve Circuit High (Bank 1 Unit 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2055 is set when the control line of DEF injector 2 on Bank 1 is shorted to battery positive. In GM's 2025 diesel table (25OBDG04B) the power stage of metering valve 2 reports the short; with more than 11 V and 30 faulty readings out of 60 the ECM stores a Type A fault, just as P2049 does for valve 1. Deutz assigns failure type 12 (voltage above normal or short to the high source) to metering unit 2 on EMR5 engines. On Ford's 2023 diesels the code instead describes a coil resistance more than 2 ohm above expectation, which hints at corroded terminals or an ageing winding. Whatever the platform, a driver that detects overvoltage is disabled, so the second dosing point delivers nothing until the circuit is repaired.

Likely causes

Control line of injector 2 shorted to battery positive
Coil resistance too high, corroded terminals (Ford definition)
Defective output stage for valve 2

Symptoms

  • MIL on
  • Second dosing point inactive
  • Increased NOx emissions

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

P2053P2054P2049P2058

References: gsi.ext.gm.com, serdia.deutz.com, fordservicecontent.com.