P051B: owner reports and bulletins
Got P051B 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
10 complaints filed with NHTSA mention P051B, 9 of them since 2015, across 7 different models. The component owners most often filed it under: engine.
Most-reported models
| Vehicle | Complaints | Model years reported |
|---|---|---|
| FORD ESCAPE | 3 | 2017 |
Manufacturer service bulletins that name P051B
29 technical service bulletins and manufacturer communications filed with NHTSA mention P051B, from 6 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:
- LINCOLN NAUTILUS (2024), bulletin 11008923: Some 2024 Nautilus vehicles equipped with a FHEV powertrain may exhibit an illuminated MIL with DTCs P0300, P0316 and/or P051B stored in the PCM. This may be due to the software level of the PCM.
- FORD BRONCO (2023), bulletin 10238285: Some 2023 Bronco vehicles built on or before 12-Jun-2023 equipped with a 2.7L engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P051B stored in the powertrain control m…
- JEEP GRAND WAGONEER (2023), bulletin 10251853: Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble …
- JEEP WAGONEER (2023), bulletin 11006243: "Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble…
- JEEP GLADIATOR (2021, 2020), bulletin 10193995: Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Codes (DTCs) P051B ? Crankcase Pressure Sensor Circuit Performance, and/or P04DB ? Crankcase Ventilation System Disconnected, Set After Powertrain Control…
- RAM 1500 (2020, 2021), bulletin 10193995: Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Codes (DTCs) P051B ? Crankcase Pressure Sensor Circuit Performance, and/or P04DB ? Crankcase Ventilation System Disconnected, Set After Powertrain Control…
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.