P050B: 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 P050B 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

5 complaints filed with NHTSA mention P050B, 4 of them since 2015, across 5 different models. The component owners most often filed it under: engine.

Manufacturer service bulletins that name P050B

93 technical service bulletins and manufacturer communications filed with NHTSA mention P050B, from 9 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • INFINITI QX60 (2022), bulletin 10238333: MIL ON WITH DTC P050B STORED IN THE ECM IF YOU CONFIRM The MIL is ON and DTC P050B COLD START CONTROL is stored in the ECM. ACTION Follow the SERVICE PROCEDURE in this bulletin to reprogram the ECM, if applicable.
  • NISSAN PATHFINDER (2022), bulletin 10239061: MIL ON WITH DTC P050B STORED IN THE ECM IF YOU CONFIRM The MIL is ON and DTC P050B COLD START CONTROL is stored in the ECM. ACTION Follow the SERVICE PROCEDURE in this bulletin to reprogram the ECM, if applicable.
  • JEEP WRANGLER (2019), bulletin 10170398: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further inves…
  • JEEP RENEGADE (2019), bulletin 10170391: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further inves…
  • JEEP CHEROKEE (2019), bulletin 10174235: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further inves…
  • FORD RANGER (2019), bulletin 10175888: Some 2019 Ranger vehicles built on or before 14-Jun-2019 may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P02EE, P02EF, P02F0, P02F1, P050A, P050B, P1026, and/or P051B stor…

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.