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.

Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.

Symptoms

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

Most likely causes

• Unplugged or corroded connector at the Bank 2 injector
• Broken wire in the harness of the second exhaust branch
• Open coil in the Bank 2 DEF injector

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the AdBlue/DEF level and quality, and do not add additives or water
2. Check the continuity of the wire between the component and the control module.
3. Look for white crystals around the injector and the tank
4. Check connectors and heaters with the scanner
5. Run the dosing test available on your diagnostic tool
6. Replace parts only when the test points to that component

Good to know

• Repair difficulty: medium
• It can trigger limp mode.
• It affects emissions.

What each character of P2050 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 0: Subsystem depends on the code range
• 50: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2050?

Deal with it soon. If the instrument cluster shows a countdown, the car may not restart once it reaches zero.

What causes code P2050?

The most common causes are: unplugged or corroded connector at the Bank 2 injector; broken wire in the harness of the second exhaust branch; open coil in the Bank 2 DEF injector.

Related codes

• P2051Reductant Injection Valve Circuit Low (Bank 2 Unit 1)
• P2052Reductant Injection Valve Circuit High (Bank 2 Unit 1)
• P2047Reductant Injection Valve Circuit/Open (Bank 1 Unit 1)
• P201AReductant Injection Valve Circuit Range/Performance (Bank 2 Unit 1)
• P2056Reductant Injection Valve Circuit/Open (Bank 2 Unit 2)

Sources

• law.cornell.edu: 13 CCR 1968.2
• gsi.ext.gm.com: 18OBDG04 Engine Diagnostics
• static.nhtsa.gov: MC 10154724 9999

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.