P1641
Cooling Fan Relay 1 Control Circuit
Severity
🔴 HighCan you drive?
Do not drive — repair immediately
Approx. repair cost
$6–33 (est.)
Symptoms
- Engine overheating
- Cooling fan does not turn on
- The fan runs constantly
- Check Engine light comes on
- Reduced engine power when overheated
Causes
- Faulty fan relay
- Open or short circuit in control circuit
- Damaged wiring harness
- Oxidized or damaged connector pins
- Engine control unit malfunction
How to Fix
- Check the condition of the fan relay and replace if necessary
- Check the integrity of the wiring and connectors in the control circuit
- Check fuses associated with the cooling system
- Scan the system for other errors
- Check the operation of the engine control unit