P0101
Medium SeverityMass Air Flow Sensor Circuit Range/Performance
Fuel System
What Does P0101 Mean?
The MAF sensor is reading outside the expected range for current engine conditions. Could be dirty, defective, or have an air leak after the sensor.
Common Fix
Clean MAF sensor with MAF cleaner
Estimated Cost (DIY)
$8 - $15
Symptoms
- ⚠️Rough idle
- ⚠️Hesitation on acceleration
- ⚠️Poor fuel economy
- ⚠️Black smoke from exhaust
Related Symptoms
Common Causes
How to Diagnose P0101
- 1Inspect and clean MAF sensor with MAF cleaner spray
- 2Check for vacuum leaks between MAF and throttle body
- 3Inspect air filter and intake duct
- 4Test MAF readings with scan tool at idle and 2500 RPM
OEM Diagnostic Flowchart
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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0101.
OEM Manual Evidence
Browse →A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL Denali AWD V8-6.2L Service Manual | Operation CHARM Operation CHARM : Car...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL Denali 2WD V8-6.2L Service Manual | Operation CHARM Operation CHARM : Car...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL 4WD V8-6.0L Service Manual | Operation CHARM Operation CHARM : Car repair...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL 4WD V8-5.3L Service Manual | Operation CHARM Operation CHARM : Car repair...
Related Symptoms
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Exact Repair Workflows
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Related Codes
The MAF sensor is reporting lower airflow than expected. The engine thinks less air is entering than actually is, causing a lean condition.
The MAF sensor is reading higher than expected airflow. This causes the engine to run rich. Could be a sensor fault or an intake leak.
The engine is running lean on bank 1 — too much air or not enough fuel. The ECM has maxed out its fuel trim trying to compensate. Common causes include vacuum leaks and dirty MAF sensors.
Frequently Asked Questions
- Can I clean a MAF sensor?
- Yes — use only dedicated MAF sensor cleaner spray. Never touch the sensor element. Cleaning fixes P0101 about 70% of the time.
- What happens if I ignore P0101?
- Poor fuel economy, rough running, and potential damage to the catalytic converter from incorrect fuel mixture.
Related Repair Guides
If your vehicle has triggered P0101, these DIY repair guides may help: