Car Problem Finder
Cooling fan keeps running: Causes, First Checks and OBD2 Codes
Electrical symptoms usually come from battery voltage, charging, grounds, fuses, modules, wiring, or a weak actuator.
Most likely causes
- Weak battery or alternator
- Bad ground or corroded terminal
- Blown fuse or relay issue
- Water ingress into connector or module
- Failing switch, motor, or actuator
First checks
- 1.Measure battery voltage before and during cranking
- 2.Check charging voltage at idle
- 3.Inspect main grounds and terminals
- 4.Check fuses with a tester, not only visually
- 5.Scan body and gateway modules when needed
Can I drive?
Drive gently only if there is no smoke, strong smell, overheating, or flashing warning light.
Do not replace yet
Do not replace expensive parts before these basic checks confirm the fault path.