P2050 Reductant Injection Valve Circuit/Open (Bank 2 Unit 1)

P2050 reports an open circuit at the first DEF injector of Bank 2, the cylinder bank opposite cylinder 1. The code only makes sense on engines whose two exhaust banks each feed their own SCR branch with a separate valve. No manufacturer publicly documents P2050; V-engines found in bulletins, such as the Cummins 5.0 L V8 in Nissan's Titan XD, combine both banks into one SCR line and report their only valve as Bank 1, unit 1. Detection would mirror P2047: GM's 2018 diesel logic reads the driver status every 100 ms with more than 11 V and needs 30 bad samples out of 60. CARB requires such actuators to be checked as comprehensive components. Suspects are plug and harness on the second exhaust branch and the coil itself; without dosing that branch emits more NOx.

Likely causes

Symptoms

• MIL on
• Higher NOx from the Bank 2 branch
• DEF warning, later inducement possible

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, gsi.ext.gm.com, static.nhtsa.gov.