P2EAE: Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 2

What it means

The reductant injection valve on bank 1 unit 2 reports a range/performance fault. Dosing accuracy on this unit is impaired.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test
• The engine or gearbox may go into limp mode

How it works

The reductant injection valve on bank 1, unit 2 meters DEF/AdBlue into the exhaust treatment system. The control module sets this code when the valve's operation or dosing response falls outside the expected range, so dosing accuracy at this specific unit is impaired.

Common causes

Most likely first.

1. Reductant injection valve fault
2. Wiring or connector fault
3. Reductant contamination or deposits

Symptoms

• Check engine light or NOx warning on
• AdBlue/DEF level or quality warning
• Possible no-start countdown after ignore period
• Failed emissions inspection (NOx)

How to diagnose it

1. Save freeze-frame data and check for related reductant-pressure, dosing, and NOx codes that could affect bank 1 unit 2.
2. Inspect the bank 1 unit 2 valve connector and wiring for damage, corrosion, loose terminals, or fluid contamination.
3. Check the valve and nearby dosing passage for DEF/AdBlue crystallisation, contamination, or deposits that could disturb its response.
4. Use scan-tool data or an approved actuation test to compare the commanded operation of the bank 1 unit 2 valve with its reported response.
5. Test the valve circuit and dosing response against the manufacturer's procedure before replacing the valve.

Common fixes

• Clean removable DEF/AdBlue deposits from the bank 1 unit 2 valve area using an appropriate service method.
• Repair damaged wiring or a loose or corroded connector at the bank 1 unit 2 valve.
• Correct contaminated DEF/AdBlue or a restriction in the supply to this valve.
• Replace the bank 1 unit 2 injection valve if its circuit and dosing response fail the specified tests.

Can I keep driving?

The engine may remain drivable, but emissions can exceed limits and a warning or no-start countdown may occur. Arrange diagnosis promptly and heed any countdown because the vehicle may eventually prevent restarting.