OBD-II DTC · SAE J2012
P2257
Sec Air Inj Sys Ctrl A Circ Low
What P2257 means
P2257 is a standard SAE J2012 powertrain diagnostic trouble code with the defined meaning: Sec Air Inj Sys Ctrl A Circ Low. This is the OEM-agnostic definition; specific manufacturer interpretation may add detail (subsystem, bank, sensor location) but the core meaning is consistent across all OBD-II compliant vehicles since 1996.
Common symptoms when P2257 is active
Generic powertrain MIL — meaning varies by manufacturer.
Can this code be suppressed via ECU tuning?
Whether this code is safe to suppress depends on the underlying cause. Diagnose first, suppress only after confirming the mechanical issue is benign or rectified.
How to remove P2257 with Softechpro V5
Recommended service: DTC OFF (generic). Step-by-step workflow:
- Look up the manufacturer-specific definition before deciding to suppress — generic P-codes can mean very different things on VAG vs PSA vs BMW.
- If the fault is benign or the underlying repair is done, Softechpro V5 DTC OFF suppresses the code.
- Load .bin, select DTC OFF, target the specific code, save patched .bin, flash back.
Softechpro V5 supports 1,400+ ECU firmwares across Bosch (EDC15, EDC16, EDC17, MD1, MG1, ME7, MED17), Siemens / Continental (SID, SIMOS, EMS), Delphi (DCM, DDC), and Magneti Marelli platforms.