How does the p0480 GMC cooling fan control circuit work?
The P0480 code is detected when the Powertrain Control Module (PCM) detects that the commanded state of the driver and the actual state of the control circuit do not match. Engine Light ON (or Service Engine Soon Warning Light) The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay.
What causes a faulty fan control relay 1?
Potential Causes. The causes for this DTC may include: Faulty fan control relay 1. Fan control relay harness is open or shorted. Circuit electrical connections poor. Faulty cooling fan 1. Faulty coolant temperature sensor. Fan cooling fan harness is open or shorted.
Why is my fan not working on my car?
There is a problem within this circuit causing the fan to fail to operate allowing the engine to overheat while sitting still or driving at a slow speed. When the PCM attempts to activate the fan and senses the command and the result do not match, the code is set.
Where are the cooling fan relay fuses located?
Open the fuse block and inspect the cooling fan relay fuses. If they are good pull the cooling fan relays out. The bottom of the fuse block lid will usually indicate placement, but if not, look in the owner’s manual. The vehicle’s PCM’s function is to act as a ground to operate components, not to supply power.
The P0480 code is detected when the Powertrain Control Module (PCM) detects that the commanded state of the driver and the actual state of the control circuit do not match. Engine Light ON (or Service Engine Soon Warning Light) The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay.
Potential Causes. The causes for this DTC may include: Faulty fan control relay 1. Fan control relay harness is open or shorted. Circuit electrical connections poor. Faulty cooling fan 1. Faulty coolant temperature sensor. Fan cooling fan harness is open or shorted.
There is a problem within this circuit causing the fan to fail to operate allowing the engine to overheat while sitting still or driving at a slow speed. When the PCM attempts to activate the fan and senses the command and the result do not match, the code is set.
Open the fuse block and inspect the cooling fan relay fuses. If they are good pull the cooling fan relays out. The bottom of the fuse block lid will usually indicate placement, but if not, look in the owner’s manual. The vehicle’s PCM’s function is to act as a ground to operate components, not to supply power.