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P0102 — Mass Airflow Circuit Low Input
SeriousEngine/AirPower derate likely — plan to stop soon
Seen on: Heavy Truck
Mass Airflow Circuit Low Input. Common causes: MAF sensor signal too low.
Don't risk it — get a diesel tech on the truck.
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 signal too low
- Short to ground
- failed sensor
First moves (roadside)
- Check MAF signal wire for ground fault
- replace sensor
FAQ
What does P0102 mean?
Mass Airflow Circuit Low Input. Common causes: MAF sensor signal too low.
How serious is P0102?
Serious — Power derate likely — plan to stop soon.
What's the most likely cause of P0102?
The most common cause is: MAF sensor signal too low. Other possibilities include Short to ground; failed sensor.
Can I keep driving with P0102?
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Throwing this code right now?
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.