P2057 code meaning
Reductant Injection Valve Circuit Low (Bank 2 Unit 2)
Powertrain system Generic code P20xx codes Check engine light
What P2057 means
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.
P2057 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2057
- MIL on
- Valve switched off, NOx conversion reduced
Common causes of P2057
- Most likelyHarness clamped against frame or exhaust bracket
- PossibleShorted windings in the injector coil
- Less likelyDEF residue in the connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Reductant injection valve
What each part of P2057 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| 57 | The exact fault in that area. |
What to do next
- Note P2057 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2057
What does P2057 mean?
P2057 means "Reductant Injection Valve Circuit Low (Bank 2 Unit 2)". P2057 is the short-to-ground case for the second DEF injector of Bank 2. It is a generic code, so it means the same on every make.
Is it safe to drive with P2057?
Drive gently and only to a workshop. With P2057 the car can go into limp mode (reduced power) to protect itself.
Will P2057 fail an emissions test?
Yes, it can. P2057 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2057 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2057 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.