P2EAE

Code

Generic P — Powertrain

Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 2

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 36 RU: 29

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Page language: EN

Causes

Open, short or high resistance in the injector harness (wiring, chafing, broken conductor)
Corroded, loose or contaminated connector at the injector
Failed or sticking reductant injection valve (solenoid/electromechanical failure)
Poor or missing ground or supply voltage to the injector circuit
Clogged nozzle or internal contamination of the reductant injector
Faulty ECM/ECU driver for the reductant injector (rare)

Symptoms

Malfunction Indicator Lamp (MIL)/Check Engine light illuminated
SCR system warnings or reduced emissions control performance
Possible engine derate or limp mode on some vehicles
Increased NOx emissions or failed emissions test
Reductant dosing errors recorded in freeze frame/live data

What to check

Retrieve freeze-frame and live data with a diagnostic scan tool; note freeze frame conditions and whether the fault is current or historic
Visually inspect the injector, harness and connector for damage, corrosion, contamination or restricted movement
Check DEF level and quality (smell, contamination, crystals) before performing electrical tests
Verify relevant fuses and relays for the reductant pump/injector circuit
Measure connector terminal voltage (supply) and ground with key on and while commanding injector
Measure injector coil resistance and compare to manufacturer spec (replace if open/short or out-of-range)

Signal parameters

Supply voltage: nominal battery voltage (~12 V) present at injector power terminal with key ON (varies by vehicle)
Injector coil resistance: typically low-ohm solenoid range (varies by design; often a few ohms to tens of ohms) — compare to OEM spec
Command type: often PWM-driven by ECM; duty cycle 0–100% during dosing commands (parameters vary by system)
Current draw during activation: should be steady and within manufacturer range (typically under several amps) — abnormal low/high current suggests open/short or stuck valve
No injector response (no change in current/voltage when commanded) indicates open circuit, bad driver, or seized valve

Diagnostic algorithm

Read and record all related codes and freeze-frame data. Note whether the code is pending or confirmed and whether other SCR/DEF codes are present.
Perform a visual inspection: check wiring harness, connector pins, signs of corrosion, crushed wires, or contamination at Bank 1 Unit 2 injector. Repair any obvious damage.
Verify DEF level and inspect for contamination or crystallization. Replace contaminated fluid and clean supply components before further electrical testing.
With ignition ON (engine OFF) measure battery voltage at the injector power terminal and verify a good ground at the return terminal. Compare to battery voltage.
Measure injector coil resistance at the connector with the harness disconnected. If resistance is open, shorted, or far outside OEM spec, replace the injector.
Command the injector ON/OFF with a scan tool while measuring voltage/current at the connector. Listen for injector actuation and confirm current draw changes. No response indicates wiring fault, bad driver, or stuck injector.
If wiring and connector appear good but injector does not operate, bench-test the injector by applying proper voltage/current per service instructions (observe safety and manufacturer bench-test procedure).
If bench test shows the injector working, perform back-probing/harness continuity checks from injector connector to ECM pins while monitoring for intermittent opens or high resistance. Repair wiring as needed.
If wiring and injector test good but fault persists, test ECM driver output for correct PWM/ground switching. Replace ECM only after confirming driver failure and ruling out harness and injector issues.
After repairs or replacements, clear codes, perform an active test/command of the injector with a scan tool, and perform a road/run test to ensure the code does not return.

Likely causes

Defective reductant injection valve (most likely)
Damaged or corroded connector or wiring to Bank 1 Unit 2
Open or high-resistance ground or supply circuit
Clogged injector/nozzle due to contaminated DEF
ECM driver fault (least likely)

Fault status

⚠️ Status

Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 2 — injector electrical signal or performance out of expected range; possible wiring, connector, valve or ECM driver fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours