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Home / DTC / P2050 — Reductant Injection Valve Circuit/Open Bank 2 Unit 1

P2050 — Reductant Injection Valve Circuit/Open Bank 2 Unit 1

Detailed page for trouble code P2050.

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P2050

Generic P — Powertrain

Reductant Injection Valve Circuit/Open Bank 2 Unit 1

Brand: Generic
Type: P — Powertrain
Views: UK: 15 EN: 37 RU: 22
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Page language: EN

Causes

  • Open or short in reductant injector wiring (broken conductor, chafing, disconnected connector)
  • Corroded, dirty, or water-intruded connector at the injector
  • Failed reductant injection valve (stuck open, stuck closed, open coil)
  • Blown fuse or failed relay supplying the reductant injector circuit
  • Poor or missing ground for the injector circuit or ECM
  • ECM driver fault or internal module failure

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced or disabled SCR reductant dosing leading to higher NOx emissions
  • Possible limp/emissions-reduced operating strategy from the ECU
  • Failed emissions test
  • Possible fault-related messages (SCR system warning) on the dash

What to check

  • Read freeze frame and complete DTC list with a capable scan tool; check pending vs stored and related SCR codes
  • Attempt an active test / command of the reductant injector with scan tool and observe response
  • Visually inspect injector connector and wiring for damage, corrosion, or contamination
  • Measure injector coil resistance with connector disconnected (compare to spec)
  • Backprobe connector while commanding injector: check for supply voltage, ground switching, and voltage change when commanded
  • Check fuses, relays, and main SCR/DEF power supply circuits

Signal parameters

  • Injector coil resistance: typically low-ohm (consult OEM spec; example ranges often ~5–30 ohms)
  • Resting connector voltage (key ON, engine OFF): ~battery voltage on supply pin
  • Commanded injector voltage behavior: ground-switched or PWM duty (voltage should change when commanded with scan tool)
  • Injector current draw while energized: measurable increase over idle (use current probe as required)
  • ECM command duty cycle or ON/OFF status reported by scan tool during active tests

Diagnostic algorithm

  1. Verify the code and any related SCR/urea codes with a scan tool. Record freeze-frame data.
  2. Visually inspect Bank 2 Unit 1 injector connector and harness for damage, corrosion, moisture, or urea crystallization. Repair as needed.
  3. With key off, disconnect injector and measure coil resistance. If open or out of spec, replace injector.
  4. Reconnect and backprobe the connector. With key ON (engine OFF) confirm supply voltage at the injector supply pin and good ground reference.
  5. Use a scan tool to command the injector while observing voltage/current at the connector. If supply is present but the driver does not switch or current is zero, suspect wiring open or ECM driver fault.
  6. Check continuity between the injector connector and ECM driver pin. Repair any open/short circuits, repair or replace damaged wiring and connectors.
  7. Inspect and test any related fuses/relays and the reductant pump/power supply circuits that feed the injector.
  8. If wiring and supply are good but valve fails to actuate or coil is out of spec, replace the reductant injection valve.
  9. After repairs clear codes and perform active test and a road or operational test to confirm correct operation and that code does not return.
  10. If problem persists after replacing injector and repairing wiring, consider ECM diagnostic/repair or replacement and consult OEM procedures.

Likely causes

  • Connector disconnected or corroded at the reductant injector (most common)
  • Wiring harness damage near engine/transmission or along harness routing
  • Failed injector coil (open circuit)
  • Blown fuse or bad relay supplying SCR injection components
  • ECM control output failed (rare)

Fault status

⚠️ Status
Reductant Injection Valve Circuit/Open detected — Bank 2, Unit 1 (electrical/open circuit condition)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

P2051 P0200 P0201 P20A0 P22F0
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