Fan 2 Control Circuit Low
The cooling fan 2 relay control circuit is detecting a low voltage condition, preventing the secondary cooling fan from operating properly. This code indicates a malfunction in the electrical circuit that controls the cooling fan relay, which can lead to engine overheating if the primary cooling system is insufficient.
What You Might Notice
- Check engine light illuminated
- Engine running hotter than normal
- Cooling fans not operating or operating intermittently
- Radiator fan noise absent during high-temperature operation
- Potential engine overheating under load or in traffic
Most Common Causes
- 1
Faulty cooling fan relay 2
The relay controlling the second cooling fan may be stuck, burned out, or internally damaged, preventing it from completing the circuit when energized.
- 2
Blown cooling fan 2 fuse
The dedicated fuse for the cooling fan 2 circuit may be blown, interrupting power to the relay and fan motor.
- 3
Wiring or connector issues
Corroded connections, loose terminals, damaged wiring, or poor grounds in the cooling fan 2 circuit can cause low voltage conditions and circuit faults.
- 4
Faulty PCM (rarely)
In rare cases, the powertrain control module may have internal damage preventing it from properly controlling the cooling fan relay output circuit.
How to Diagnose It
- 1
Check Faulty cooling fan relay 2 — The relay controlling the second cooling fan may be stuck, burned out, or internally damaged, preventing it from completing the circuit when energized.
- 2
Check Blown cooling fan 2 fuse — The dedicated fuse for the cooling fan 2 circuit may be blown, interrupting power to the relay and fan motor.
- 3
Check Wiring or connector issues — Corroded connections, loose terminals, damaged wiring, or poor grounds in the cooling fan 2 circuit can cause low voltage conditions and circuit faults.
- 4
Check Faulty PCM (rarely) — In rare cases, the powertrain control module may have internal damage preventing it from properly controlling the cooling fan relay output circuit.
How to Fix It
- 1
Replace cooling fan 2 fuse
Locate the fuse panel, identify the cooling fan 2 fuse, and replace it with a new fuse of the correct amperage rating. If the fuse blows again, there is likely a short circuit requiring further diagnosis.
- 2
Replace cooling fan 2 relay
Access the relay panel (typically under the hood or beneath the dashboard), identify the cooling fan 2 relay, and replace it with an OEM or quality replacement relay of the same specification.
- 3
Inspect and repair wiring and connectors
Visually inspect all cooling fan 2 circuit wiring for damage, corrosion, and loose connections. Clean corroded connectors with electrical contact cleaner and repair or replace damaged wiring as needed.
- 4
Diagnose PCM fault
If fuse, relay, and wiring are confirmed functional, perform advanced diagnostics using a scan tool to test PCM cooling fan output control. Replace the PCM if it cannot properly modulate the cooling fan 2 circuit.
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