P2057Reductant Injection Valve Circuit Low (Bank 2 Unit 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- MIL on
- Valve switched off, NOx conversion reduced
- Likely causes
- LikelyHarness clamped against frame or exhaust bracket
- PossibleShorted windings in the injector coil
- RareDEF residue in the connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.