P0100: Mass or Volume Air flow Circuit Malfunction
HighPowertrainFuel Metering
What does P0100 mean?
P0100 is a diagnostic trouble code indicating "Mass or Volume Air flow Circuit Malfunction". The ECU is detecting a voltage reading that is below the expected range in the fuel metering circuit. This typically points to a wiring short, a faulty sensor, or a grounding issue.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- Intermittent warning lights
- Erratic gauge readings
Estimated repair cost
Typical range in Australia (parts + labour)
$150 – $500 AUD
Common causes
- Damaged or corroded wiring harness
- Loose or disconnected electrical connector
- Failed fuel metering sensor or actuator
- Blown fuse in the related circuit
- Poor ground connection
What should you do?
This is a significant issue that should be diagnosed and repaired soon. Avoid long trips or heavy driving until the problem is resolved. Continued driving may cause additional damage.
Get a diagnosis for YOUR car
Code P0100 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.