What Does P010A Mean?
The PCM has detected a general malfunction in the mass air flow (MAF) sensor 'B' circuit. On vehicles with dual intake tracts (V-engines or twin-turbo configurations), this refers to the secondary MAF sensor. The circuit may be open, shorted, or producing no valid signal. The driver will notice reduced performance, poor fuel economy, and potentially rough running or hesitation, particularly affecting the bank served by the 'B' MAF sensor.
Common Causes
30%
Faulty mass air flow 'B' sensor with internal circuit failure
25%
Disconnected or damaged MAF 'B' sensor connector
20%
Open or shorted wiring in the MAF 'B' sensor circuit
15%
Blown fuse or loss of power supply to the MAF 'B' sensor
10%
PCM internal failure on the MAF 'B' input circuit
Diagnostic Steps
1
Check the MAF 'B' sensor PID in live data — a reading of 0 g/s or a fixed implausible value with the engine running confirms a circuit malfunction.
2
Verify the MAF 'B' sensor connector is fully seated and the lock tab is engaged — inspect for bent pins, corrosion, or moisture in the connector.
3
With key on engine off, measure the voltage at the MAF 'B' sensor connector — verify 12V power supply and good ground (less than 0.1V drop from battery negative).
4
Compare MAF 'A' and MAF 'B' PIDs — if 'A' reads normally but 'B' is at zero or fixed, the problem is isolated to the 'B' circuit.
5
Check the fuse associated with the MAF 'B' sensor power circuit — on some vehicles, the 'B' sensor may be on a different fuse than the 'A' sensor.
6
If power and ground are present but no signal output, replace the MAF 'B' sensor.
Estimated Repair Cost
$80 - $400
Parts + labor, varies by vehicle and location
The PCM has detected a general malfunction in the mass air flow (MAF) sensor 'B' circuit. On vehicles with dual intake tracts (V-engines or twin-turbo configurations), this refers to the secondary MAF sensor. The circuit may be open, shorted, or producing no valid signal. The driver will notice redu...
The most common cause of P010A (Mass or Volume Air Flow "B" Circuit) is: Faulty mass air flow 'B' sensor with internal circuit failure
Typical repair costs for P010A range from $80 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is drivable but with degraded performance on the affected bank. The PCM will use estimated airflow for the 'B' intake, resulting in less accurate fuel delivery. The engine may run rough on one bank and the catalytic converter on that side may be stressed. Drive to a repair facility and avoid heavy load or towing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P010A to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel / Air Metering System
Difficulty
Type
Generic (SAE)
Recommended Tools
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