Powertrain, generic (extended)

P2047 Reductant Injection Valve Circuit/Open (Bank 1 Unit 1)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2047 covers the electrical path of the first DEF dosing valve on Bank 1, which in nearly every SCR layout is the only one. The controller watches the valve's low-side driver and flags an open load: a broken wire, an unplugged connector or a burnt-out coil. GM's 6.6 L LML table expects roughly 200 kOhm between pin and load for 3 s (Type A); GM's 2018 diesel table counts 30 faulty samples out of 60. Ford's 2023 diesel summary reads 2.6 to 3.4 V on the idle output within 2 s. Ram found loose terminals at the injector plug, Volvo VNR trucks a harness chafed by a loose heat shield. On the LGH/LML GM ranks P2047 as a tamper-type fault, so the warning sequence toward a speed limit starts early; with no DEF sprayed, NOx rises.

Likely causes

Loose, corroded or pushed-out terminals at the DEF injector plug
Harness wire broken or chafed through near the exhaust
Open coil inside the DEF injector
Faulty output stage or software in the engine/dosing control module

Symptoms

  • MIL on, often together with a DEF system warning
  • Speed limitation countdown after continued driving
  • Increased NOx, failed emissions inspection

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 valvereductant injection harness

Related codes

P2048P2049P202EP2050P2053

References: gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com, static.nhtsa.gov.