P2057: Reductant Injection Valve Circuit Low (Bank 2 Unit 2)

P2057 is the short-to-ground case for the second DEF injector of Bank 2. As with P2056 and P2058, it exists in the code list for engines with two exhaust banks and two dosing points each, yet no manufacturer publishes a calibration or service bulletin for it. Analogous logic is documented for Bank 1: GM's 2025 diesel table flags a low-side ground short at metering valve 2 (P2054) after 30 out of 60 samples, Type A, and the Deutz EMR5 list describes failure type 11 for that position. Likely culprits are a harness clamped against the frame or an exhaust bracket, shorted coil windings and DEF residue in the connector. Because the output stage switches the valve off, its catalyst segment converts noticeably less NOx.

Medium severity. Can I keep driving?Deal with it soon. If the instrument cluster shows a countdown, the car may not restart once it reaches zero.

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

Symptoms

MIL on
Valve switched off, NOx conversion reduced

Most likely causes

Harness clamped against frame or exhaust bracket
Shorted windings in the injector coil
DEF residue in the connector

What to check, in order

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

Check the AdBlue/DEF level and quality, and do not add additives or water
With the connector unplugged, check whether the signal wire is making contact with ground.
Look for white crystals around the injector and the tank
Check connectors and heaters with the scanner
Run the dosing test available on your diagnostic tool
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 P2057 means

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

Frequently asked questions

Can I keep driving with code P2057?

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

What causes code P2057?

The most common causes are: harness clamped against frame or exhaust bracket; shorted windings in the injector coil; dEF residue in the connector.

Related codes

Sources

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.