Fault Family System: Powertrain (P-Codes) 15 SAE Codes

MAF Circuit

Diagnostic & Technical Explanation

Code P00BC (Mass or Volume Air Flow A Circuit Range/Performance - Air Flow Too Low) sets when the ECM detects an implausible signal from the mass air flow sensor — reported airflow disagrees with throttle position and engine speed, or the signal voltage leaves its calibrated window. The most common physical causes are a contaminated MAF sensing element, unmetered air entering the intake downstream of the sensor, and chafed or corroded wiring in the sensor's 5V reference / signal-return circuit.

These 15 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 15 times.

Codes in this family (15)

Code	Definition	Repair coverage
P00BC	Mass or Volume Air Flow A Circuit Range/Performance - Air Flow Too Low	7 ranked fixes
P00BD	Mass or Volume Air Flow A Circuit Range/Performance - Air Flow Too High	7 ranked fixes
P00BE	Mass or Volume Air Flow B Circuit Range/Performance - Air Flow Too Low	7 ranked fixes
P00BF	Mass or Volume Air Flow B Circuit Range/Performance - Air Flow Too High	7 ranked fixes
P0100	Mass or Volume Air Flow Sensor A Circuit	7 ranked fixes
P0101	Mass or Volume Air Flow Sensor A Circuit Range/Performance	7 ranked fixes
P0102	Mass or Volume Air Flow Sensor A Circuit Low	7 ranked fixes
P0103	Mass or Volume Air Flow Sensor A Circuit High	7 ranked fixes
P0104	Mass or Volume Air Flow Sensor A Circuit Intermittent	7 ranked fixes
P010A	Mass or Volume Air Flow Sensor B Circuit	7 ranked fixes
P010B	Mass or Volume Air Flow Sensor B Circuit Range/Performance	7 ranked fixes
P010C	Mass or Volume Air Flow Sensor B Circuit Low	7 ranked fixes
P010D	Mass or Volume Air Flow Sensor B Circuit High	7 ranked fixes
P010E	Mass or Volume Air Flow Sensor B Circuit Intermittent/Erratic	7 ranked fixes
P010F	Mass or Volume Air Flow Sensor A/B Correlation	7 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)

Need All 15,886 Codes as Data?

Pipe-delimited CSV, Apache Parquet and a relational SQLite database, with commercial application rights and instant download. Built for scan tools, shop software and research - not assembled one web page at a time.

License OEM Complete · $149 Standard (SAE only) · $49

$49 Standard: 9,249 SAE codes · $149 OEM Complete: all 15,886 codes, including 6,637 OEM codes across 32 makes · $149 Heavy Duty: 4,212 fault pairs (J1939) · one-time · compare tiers