Faulty high-speed fan relay (stuck contacts or failed coil); Wiring damage, corrosion or poor connections in the relay control or power circuit; Blown fuse or fusible link supplying the high-speed fan circuit; Corroded or loose relay socket terminals or fuse box fault; Failed cooling fan motor drawing excess current or open circuit; Fault in the engine control unit output driver.

P1476

Fan Relay (High) Circuit Malfunction.

Other
Powertrain
Manufacturer code
Medium severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
4: AreaAuxiliary emission controls
76: FaultThe specific fault in that area

What it means

P1476 is a manufacturer-specific code, and for this guide it means a fault in the high-speed cooling fan relay circuit. The engine control unit commands the high-speed fan relay and monitors the circuit. It sets the code when the voltage or feedback it sees does not match what it commanded, for example an open circuit, a short, or a relay that does not respond. Other manufacturers use P1476 for unrelated faults, so confirm the definition for the exact make and model before diagnosing.

Symptoms

Engine overheating, especially in traffic or when idling
Cooling fan not running at high speed, or running constantly
Engine temperature warning light or gauge reading high
Air conditioning performing poorly when stationary
Engine warning light on, with possible reduced performance

Possible causes

Faulty high-speed fan relay (stuck contacts or failed coil)likely
Wiring damage, corrosion or poor connections in the relay control or power circuitlikely
Blown fuse or fusible link supplying the high-speed fan circuitpossible
Corroded or loose relay socket terminals or fuse box faultpossible
Failed cooling fan motor drawing excess current or open circuitpossible
Fault in the engine control unit output driverrare

How to diagnose

Confirm the code's definition for this specific make and model, then read freeze frame data and check for other stored cooling or electrical codes.
Visually inspect the fan, relay box, fuses and wiring for damage, chafing, heat marks, water ingress or corrosion.
Check the fuse and any fusible link for the high-speed fan circuit, referring to the wiring diagram for the model.
Swap the relay with a known good one of the same type if the layout allows, or test the relay coil and contacts on the bench.
Check the relay socket for battery supply, earth and control signal using a multimeter, with the ignition on and the fan commanded on.
Command the fan on with a scan tool's actuator test and observe whether the relay clicks and the fan runs at high speed.
Test the fan motor current draw and its wiring for open circuits, short circuits or high resistance.
Check for control unit software updates and only suspect the control unit after all wiring and components test good.

How to fix

Replace the faulty fan relay with the correct specification part.
Repair or replace damaged wiring and connectors, and clean or renew corroded terminals.
Replace the blown fuse or fusible link after finding and fixing the cause of the overload.
Renew the cooling fan motor or fan assembly if it is seized or drawing excessive current.
Repair or replace the relay socket or fuse box if its terminals are damaged.
Repair or replace the engine control unit, or update its software where a fault is confirmed, only once all else is ruled out.

Can I keep driving?

Medium severity

Short, careful journeys are possible if the temperature gauge stays normal, but avoid traffic and long runs because the engine may overheat without the high-speed fan. Stop at once if the temperature rises to the warning zone, as overheating can cause serious engine damage.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.