B1002 — HVAC Control Module Voltage Low
Seen on: Heavy Truck
HVAC Control Module Voltage Low. Common causes: HVAC control module under-voltage.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Caution. Limp to the next safe stop.
Most likely causes
- HVAC control module under-voltage
- Battery or alternator fault
- high resistance connection
First moves (roadside)
- Check battery voltage
- test alternator output
- inspect power connections
FAQ
HVAC Control Module Voltage Low. Common causes: HVAC control module under-voltage.
Caution — Limp to the next safe stop.
The most common cause is: HVAC control module under-voltage. Other possibilities include Battery or alternator fault; high resistance connection.
Limp to the next safe stop. 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.