What Does P010D Mean?
The ECM has detected an abnormally high voltage or signal from the Mass Air Flow (MAF) sensor "B" circuit. The sensor is reporting far more airflow than the engine could actually be ingesting under current conditions. This will cause the ECM to inject excess fuel, resulting in rich running, black smoke from the exhaust, poor fuel economy, and possibly fouled spark plugs.
Common Causes
35%
Failed MAF "B" sensor producing an erroneously high output signal
25%
Short to voltage in MAF "B" signal wire
20%
Contamination on MAF "B" hot-wire element causing inaccurate high readings
15%
Corroded or damaged connector causing signal wire to contact the 5V reference
5%
ECM internal pull-up fault on MAF "B" input
Diagnostic Steps
1
Monitor live data for MAF "B" sensor — at idle, readings above 15 g/s or voltage above 4.5V confirm the high circuit condition.
2
Disconnect the MAF "B" sensor and check if the signal wire voltage at the ECM drops to 0V. If it stays high, there is a short to voltage in the harness.
3
Inspect the wiring harness for chafing where the MAF signal wire may contact a 12V or 5V source. Pay attention to areas near engine heat shields or sharp edges.
4
Remove and inspect the MAF "B" sensor element for oil contamination, debris, or physical damage. Attempt cleaning with MAF sensor cleaner and retest.
5
If the sensor and wiring are confirmed good, swap MAF "A" and MAF "B" sensors to see if the fault follows the sensor or stays with the circuit.
Estimated Repair Cost
$75 - $400
Parts + labor, varies by vehicle and location
The ECM has detected an abnormally high voltage or signal from the Mass Air Flow (MAF) sensor "B" circuit. The sensor is reporting far more airflow than the engine could actually be ingesting under current conditions. This will cause the ECM to inject excess fuel, resulting in rich running, black sm...
The most common cause of P010D (Mass or Volume Air Flow "B" Circuit High) is: Failed MAF "B" sensor producing an erroneously high output signal
Typical repair costs for P010D range from $75 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle can be driven cautiously but will run very rich. Excess fuel can wash cylinder walls leading to accelerated wear, and can overheat or damage the catalytic converter. Repair promptly to avoid secondary damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P010D 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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