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

Turbo Inlet Pressure Sensor Circuit

Diagnostic & Technical Explanation

Code P012A (Turbocharger/Supercharger Inlet Pressure Sensor A Circuit) sets when the ECM sees an open, shorted, or out-of-range signal from the turbo/supercharger inlet pressure sensor used to compute boost and correlate with MAP/barometric readings. Causes are a failed sensor element, a blocked or oil-fouled pressure port, or damaged sensor wiring.

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
P012A	Turbocharger/Supercharger Inlet Pressure Sensor A Circuit	3 ranked fixes
P012B	Turbocharger/Supercharger Inlet Pressure Sensor A Circuit Range/Performance	3 ranked fixes
P012C	Turbocharger/Supercharger Inlet Pressure Sensor A Circuit Low	3 ranked fixes
P012D	Turbocharger/Supercharger Inlet Pressure Sensor A Circuit High	3 ranked fixes
P012E	Turbocharger/Supercharger Inlet Pressure Sensor A Circuit Intermittent/Erratic	3 ranked fixes
P2374	Turbocharger/Supercharger Inlet Pressure Sensor B Circuit	3 ranked fixes
P2375	Turbocharger/Supercharger Inlet Pressure Sensor B Circuit Range/Performance	3 ranked fixes
P2376	Turbocharger/Supercharger Inlet Pressure Sensor B Circuit Low	3 ranked fixes
P2377	Turbocharger/Supercharger Inlet Pressure Sensor B Circuit High	3 ranked fixes
P2378	Turbocharger/Supercharger Inlet 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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