P2201: owner reports and bulletins

Powertrain (generic, all makes). We haven't written the explanation for this code yet. Below is what owners and manufacturers have filed with NHTSA.

Got P2201 on your scanner? Tell the mechanic your year, make, model and any symptoms and you'll get the likely cause and what to check first. Ask about this code.

What owners report to NHTSA

2 complaints filed with NHTSA mention P2201, 2 of them since 2015, across 2 different models. The component owners most often filed it under: engine.

Manufacturer service bulletins that name P2201

92 technical service bulletins and manufacturer communications filed with NHTSA mention P2201, from 9 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • MACK MACK, bulletin 10188078: Selective Catalytic Reduction ( SCR ) Efficiency And NOx Sensor Diagnostic Trouble Codes ( DTC ) P225C, P225E, P221A and P2201: NOx Sensor Diagnostic Information TO BE USED BEFORE SENSOR REPLACEMENT - OBD13 And Newer Emi…
  • VOLVO VOLVO TRUCK, bulletin 10188102: Selective Catalytic Reduction ( SCR ) Efficiency And NOx Sensor Diagnostic Trouble Codes ( DTC ) P225C, P225E, P221A and P2201: NOx Sensor Diagnostic Information TO BE USED BEFORE SENSOR REPLACEMENT - OBD13 And Newer Emi…
  • VOLVO VOLVO, bulletin 10200944: Selective Catalytic Reduction ( SCR ) Efficiency And NOx Sensor Diagnostic Trouble Codes ( DTC ) P225C, P225E, P221A and P2201: NOx Sensor Diagnostic Information TO BE USED BEFORE SENSOR REPLACEMENT - OBD13 And Newer Emi…
  • FORD F-750 SD (2024, 2025), bulletin 11006773: Some 2024-2025 F-650/F-750 vehicles built on or before 22-Jul-2024 and equipped with a 6.7L engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC) P203B, P206B, and/or P220…
  • FORD F-650 INCOMPLETE CHASSIS (2024), bulletin 10246139: Some 2024 F-650/F-750 vehicles built on or before 27-Oct-2023 and equipped with a 6.7L engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC) P060C, U1022, P0093, P01C4, U3…
  • ISUZU N-SERIES (2022, 2023, 2024), bulletin 11005679: CUSTOMER SATISFACATION CAMPAIGN_ ISUZU HAS DETERMINED THAT CERTAIN 2022 2024MY ISUZU N-SERIES VEHICLES EQUIPPED WITH 5.2L (4HK1) DIESEL ENGINES AND OPTION (IE1) 4-WHEEL DISC BRAKES WERE BUILT WITH AN ENGINE CONTROL MODUL…

Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.