P051B — Crankcase Pressure Sensor Circuit Range
What it means: Crankcase Pressure Sensor Circuit Range.
How serious / can you keep driving: Caution. Limp to the next safe stop.
Check first: Check crankcase pressure sensor port for blockage
Don't risk it — look up listed providers near you and give them this code when you call.
Listed providers nearest Indianapolis, IN
Closest first. Tell them P051B and what the truck is doing. RoadService.app lists these providers and does not employ them or carry out the repair.
- 0.0 mi away — based in Indianapolis, IN · (317) 789-5002
- 0.0 mi away — based in Indianapolis, IN · (317) 300-7000
- 0.0 mi away — based in Indianapolis, IN · (317) 646-8208
Seen on: Heavy Truck
What P051B means
Crankcase Pressure Sensor Circuit Range. Common causes: Crankcase pressure sensor fault.
How serious is it?
Caution. Limp to the next safe stop.
Most likely causes
- Crankcase pressure sensor fault
- Failed sensor
- blocked sensor port
First moves (roadside)
- Check crankcase pressure sensor port for blockage
- measure sensor resistance
FAQ
Crankcase Pressure Sensor Circuit Range. Common causes: Crankcase pressure sensor fault.
Caution — Limp to the next safe stop.
The most common cause is: Crankcase pressure sensor fault. Other possibilities include Failed sensor; blocked sensor port.
Limp to the next safe stop. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Related codes
Codes that commonly appear alongside P051B, or share the same subsystem.
- Engine Protection — Power Derate Active (SPN 1569 FMI 31)
- Intake Manifold (Charge Air) Temp — High (SPN 105 FMI 0)
- Turbo Boost Pressure — High / Overboost (SPN 1127 FMI 16)
- Boost pressure high (SPN 102 FMI 0)
- Boost sensor — voltage low (SPN 102 FMI 4)
- Intake manifold temp — voltage high (SPN 105 FMI 3)
- Intake manifold temp — voltage low (SPN 105 FMI 4)
- Injection control pressure low (HEUI — older engines) (SPN 164 FMI 1)
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.