P0100 — Mass Airflow Sensor Circuit Malfunction
Seen on: Heavy Truck
Mass Airflow Sensor Circuit Malfunction. Common causes: MAF sensor circuit fault.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- MAF sensor circuit fault
- Failed sensor
- dirty sensor element
- wiring fault
First moves (roadside)
- Inspect MAF sensor for contamination
- measure signal voltage
- replace if failed
FAQ
Mass Airflow Sensor Circuit Malfunction. Common causes: MAF sensor circuit fault.
Serious — Power derate likely — plan to stop soon.
The most common cause is: MAF sensor circuit fault. Other possibilities include Failed sensor; dirty sensor element; wiring fault.
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.