What Does P010C Mean?
The ECM has detected an abnormally low voltage or signal from the Mass Air Flow (MAF) sensor "B" circuit. This typically means the sensor is reporting significantly less airflow than expected for current engine operating conditions. The driver may experience poor acceleration, stalling, a lean condition with misfires, or difficulty maintaining idle speed.
Common Causes
30%
Damaged or corroded wiring/connector at MAF "B" sensor causing signal drop
30%
Failed MAF "B" sensor producing low output
20%
Short to ground in MAF "B" signal wire
15%
Open circuit in MAF "B" sensor 5V reference or signal return
5%
ECM internal fault on MAF "B" input circuit
Diagnostic Steps
1
Check live data for MAF "B" sensor voltage — a reading stuck near 0V or below 0.5V at idle confirms the low circuit condition.
2
Inspect the MAF "B" sensor connector for backed-out pins, corrosion, water intrusion, or bent terminals. Clean contacts with electrical contact cleaner.
3
Using a DVOM, backprobe the MAF "B" signal wire at the ECM connector and verify 5V reference is present. Check for continuity between sensor connector and ECM.
4
Check for short to ground on the MAF "B" signal wire — disconnect both the sensor and ECM connectors, measure resistance from signal wire to chassis ground (should be open/infinite).
5
If wiring checks pass, substitute a known-good MAF "B" sensor and verify the reading normalizes on live data.
Estimated Repair Cost
$75 - $400
Parts + labor, varies by vehicle and location
The ECM has detected an abnormally low voltage or signal from the Mass Air Flow (MAF) sensor "B" circuit. This typically means the sensor is reporting significantly less airflow than expected for current engine operating conditions. The driver may experience poor acceleration, stalling, a lean condi...
The most common cause of P010C (Mass or Volume Air Flow "B" Circuit Low) is: Damaged or corroded wiring/connector at MAF "B" sensor causing signal drop
Typical repair costs for P010C range from $75 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Driveable with reduced performance but the engine may run excessively lean, increasing the risk of misfires and potential catalytic converter overheating. Avoid extended highway driving until resolved.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P010C to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel / Air Metering
Difficulty
Type
Generic (SAE)
Recommended Tools
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