Fault Family System: Powertrain (P-Codes) 10 SAE Codes

Crankcase Pressure Sensor Circuit

Diagnostic & Technical Explanation

Code P051A (Crankcase Pressure Sensor A Circuit) sets when the ECM sees an open, shorted, or implausible signal from the crankcase pressure sensor used to monitor PCV system function. Causes are a sensor port clogged with oil residue, a failed sensor element, or corroded/chafed wiring between the sensor and ECM.

These 10 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 10 times.

Codes in this family (10)

Code	Definition	Repair coverage
P051A	Crankcase Pressure Sensor A Circuit	3 ranked fixes
P051B	Crankcase Pressure Sensor A Circuit Range/Performance	3 ranked fixes
P051C	Crankcase Pressure Sensor A Circuit Low	3 ranked fixes
P051D	Crankcase Pressure Sensor A Circuit High	3 ranked fixes
P051E	Crankcase Pressure Sensor A Circuit Intermittent/Erratic	3 ranked fixes
P2C32	Crankcase Pressure Sensor B Circuit	3 ranked fixes
P2C33	Crankcase Pressure Sensor B Circuit Range/Performance	3 ranked fixes
P2C34	Crankcase Pressure Sensor B Circuit Low	3 ranked fixes
P2C35	Crankcase Pressure Sensor B Circuit High	3 ranked fixes
P2C36	Crankcase Pressure Sensor B Circuit Intermittent/Erratic	3 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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