B1030 — Ambient Air Temperature Sensor Fault
Seen on: Heavy Truck
Ambient Air Temperature Sensor Fault. Common causes: AAT sensor failure.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Informational. Usually OK to continue — monitor closely.
Most likely causes
- AAT sensor failure
- Failed sensor
- heat soaked location
First moves (roadside)
- Check AAT sensor location and resistance
- replace if incorrect reading
FAQ
Ambient Air Temperature Sensor Fault. Common causes: AAT sensor failure.
Informational — Usually OK to continue — monitor closely.
The most common cause is: AAT sensor failure. Other possibilities include Failed sensor; heat soaked location.
Usually OK to continue — monitor closely. 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.