The P010C code signals that there’s an issue with the “B” Circuit of the Mass Air Flow (MAF) Sensor, specifically that it’s outputting a lower signal than expected. This condition can lead to several engine performance problems, including rough idling, misfiring, and a noticeable drop in power, as the engine struggles to correctly balance air and fuel intake based on inaccurate data from the MAF sensor.
P010C quick overview
| Meaning | P010C: Mass Air Flow (MAF) Sensor “B” Circuit Low. |
| Is it serious? | Yes, it can lead to engine performance issues like rough idle, misfires, or reduced power. |
| Possible causes | – Faulty MAF sensor – Damaged wiring or connectors to the MAF sensor – Vacuum leaks – Electrical issues with the ECM (Engine Control Module) |
| How to diagnose? | Inspect the MAF sensor for any debris or damage. Check wiring and connectors for damage or corrosion. Test MAF sensor voltage with a multimeter to confirm output. Inspect air intake system for any obstructions. Perform a leak down and running compression test to compare cylinders. Verify spark by grounding the spark plug to the engine. Ensure proper voltage supply to the MAF sensor. |
P010C Meaning
The P010C code means there’s a problem with the “B” circuit of your car’s Mass Air Flow (MAF) Sensor, indicating it’s sending a lower than expected signal to the engine’s computer. This sensor plays a critical role in measuring the amount of air entering the engine, which affects how much fuel is injected for optimal combustion.
When this signal is too low, it can cause issues like misfiring, a rough idle, or a drop in power because the engine might not be getting the right fuel-to-air ratio. Fixing this involves checking the sensor, wiring, and ensuring there’s no air intake obstructions or vacuum leaks.
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How to fix P010C – learn from mechanics
I looked into P010C service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Infiniti P010C
Vehicle Information 2010 Infiniti FX35 3.5L
Issue + Repair History
- Intermittent misfire diagnosed on cylinder 3
- Engine exhibits knock and surging idle
- Power balance test confirms cylinder 3 not contributing
- Coil and plug swapped with known good cylinder, misfire remains on cylinder 3
- Compression test shows consistent readings in both cylinder 3 and a healthy cylinder
- Uncertainty in properly grounding coil pulse at harness for testing
- Suspected ECM issue due to potential lack of spark
- Possibility of mechanical issue in valvetrain indicated by knocking sound
Other OBD2 Codes + Test Results
- P010C: MAF sensor bank 2 circuit low
- P0300: Multiple cylinder misfire
Mechanic Suggestions
- Perform leak down test and running compression test to compare with healthy cylinder
- Inspect MAF sensor for debris or obstructions, particularly bugs lodged in sensing wires
- Check exhaust valve operation by pressurizing cylinder and listening for leaks to intake and exhaust
- Verify spark by grounding spark plug to engine and visually checking for spark
- Clarify proper grounding for coil pulse testing, potentially between power and signal rather than signal and ground
- Ensure oil pressure is adequate due to known issues with internal oil leaks in older 3.5L engines
Final Fix
- Discovered broken exhaust valve
- Replaced faulty valve and addressed ECM with several coil drivers malfunctioning
- Engine running smoothly after repair, but now requires replacement catalytic converters due to prolonged operation with issues
Case #2: Ford P010C
Vehicle Information 2012 Ford Focus SE 2.0L
Issue + Repair History
- MIL on with a code P010C (MAF “B” Circuit Low)
- Customer reports rough idle and reduced engine power
- Previous repairs include replacing air filter and cleaning MAF sensor
- Symptoms persist despite previous repair attempts
Other OBD2 Codes + Test Results
- No other OBD2 codes present
- MAF sensor readings indicate low voltage output
- Fuel trims show lean condition
- Vacuum leak test conducted, no leaks detected
Mechanic Suggestions
- Check wiring harness and connectors related to MAF sensor for damage or corrosion
- Test MAF sensor with multimeter to verify voltage output
- Verify proper voltage supply to MAF sensor
- Inspect for any obstructions or debris in the air intake system
- Consider replacing MAF sensor with new OEM part if issues persist
Final Fix
- Discovered damaged wiring harness leading to MAF sensor
- Repaired wiring harness and cleared codes
- Car runs smoothly without any further issues after repair
Case #3: Chevrolet P010C
Vehicle Information 2013 Chevrolet Malibu LT 2.5L
Issue + Repair History
- MIL on with a code P010C (MAF “B” Circuit Low)
- Customer complains of rough idle and lack of power during acceleration
- Previous repair attempts include cleaning MAF sensor and replacing air filter
- Symptoms persist despite previous attempts to address the issue
Other OBD2 Codes + Test Results
- No other OBD2 codes present
- MAF sensor readings indicate low voltage output
- Fuel trims show lean condition
- No vacuum leaks detected during smoke test
Mechanic Suggestions
- Check wiring harness and connectors related to MAF sensor for damage or corrosion
- Test MAF sensor with multimeter to verify voltage output
- Verify proper voltage supply to MAF sensor
- Inspect for any obstructions or debris in the air intake system
- Consider replacing MAF sensor with new OEM part if issues persist
Final Fix
- Discovered damaged connector leading to MAF sensor
- Replaced connector and cleared codes
- Car runs smoothly without any further issues after repair
How to diagnose P010C
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
| Diagnostic Step | Brief Explanation |
|---|---|
| Inspect the MAF sensor and air intake | Checks for any physical obstructions or sensor damage. |
| Check wiring and connectors to the MAF | Looks for electrical issues that could affect the sensor signal. |
| Test MAF sensor voltage with a multimeter | Confirms whether the MAF sensor is functioning properly. |
| Perform leak down and compression tests | Helps identify if there are any mechanical issues in the engine. |
| Verify proper grounding for coil testing | Ensures accurate diagnostics of ignition system components. |
| Ensure adequate oil pressure | Addresses potential internal engine issues affecting performance. |
| Replace damaged components (valve, wiring, connector) | Fixes identified mechanical or electrical problems. |
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko