Spn 1548 5 Hvac Duct Temperature - This report provides a reference for vehicle inspection and. Things like an open in the harness can cause a high voltage code. The only thing it can be is an open in the harness, or the front control unit can be bad. The only things that can. Dtc/light spn fmidescription possible causes diagnostics 3 fmi spn 520250 6 blower output short circuit blower relay failure or relay enable signal from system controller shorted to. Could be hvac related error. Mine just came on as well the same time i lost all air in the cab. Still getting air in the sleeper but now the fan level 8 (max) is more like a level 4. In the hvac unit, there is a temp sensor. This is more for the automatic portion of the hvac system. The fmi 5 is indicating that it is open circuit. This will only affect certain hvac functions. Just this for now. What's the make/model/year of your truck? Either damaged wiring or connector pins or replace the failed sensor. I'd suggest to disconnect a battery for 15 mins, reconnect, wait for 5 mins and try to restart. If it doesn't help (sometimes there's a program block to prevent stealing equipment). Hvac duct temperature fmi description: Current below normal or open circuit count: Right fuel level sensor.
This report provides a reference for vehicle inspection and. Things like an open in the harness can cause a high voltage code. The only thing it can be is an open in the harness, or the front control unit can be bad. The only things that can. Dtc/light spn fmidescription possible causes diagnostics 3 fmi spn 520250 6 blower output short circuit blower relay failure or relay enable signal from system controller shorted to. Could be hvac related error. Mine just came on as well the same time i lost all air in the cab. Still getting air in the sleeper but now the fan level 8 (max) is more like a level 4. In the hvac unit, there is a temp sensor. This is more for the automatic portion of the hvac system. The fmi 5 is indicating that it is open circuit. This will only affect certain hvac functions. Just this for now. What's the make/model/year of your truck? Either damaged wiring or connector pins or replace the failed sensor.