Faulty high speed radiator fan ground control relay; Damaged, chafed or corroded wiring in the relay control circuit (open or short to ground or voltage); Corroded or loose connector at the relay, fan motor or powertrain control module; Poor power or ground supply to the relay, or a blown fuse feeding it; Faulty cooling fan motor drawing excess current or shorted internally; Fault inside the powertrain control module driver circuit.

P1498

High Speed Rad Fan Ground CTRL Rly Circuit.

Dodge
Powertrain
Manufacturer code
Medium severity

How this code is built

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

What it means

P1498 on a Dodge means the powertrain control module has detected a fault in the circuit that operates the high speed radiator fan ground control relay. The module commands the relay on or off and monitors the circuit. When the voltage it sees does not match the commanded state, such as an open, short to ground or short to voltage, it sets the code. Exact relay layout and fan arrangement vary by model and engine.

Symptoms

Check engine light on
Radiator fan not running at high speed
Engine running hot or temperature gauge climbing in traffic
Air conditioning performing poorly when stationary
Fan running constantly at high speed
Possible overheating warning at idle or low speed

Possible causes

Faulty high speed radiator fan ground control relaylikely
Damaged, chafed or corroded wiring in the relay control circuit (open or short to ground or voltage)likely
Corroded or loose connector at the relay, fan motor or powertrain control modulepossible
Poor power or ground supply to the relay, or a blown fuse feeding itpossible
Faulty cooling fan motor drawing excess current or shorted internallypossible
Fault inside the powertrain control module driver circuitrare

How to diagnose

Read all stored codes and freeze frame data, noting coolant temperature and whether the air conditioning was on when the code set
Check the relevant fuses and relay in the power distribution centre for damage, heat marks or corrosion
Inspect the fan wiring, relay connector and fan connector for chafing, water ingress, melted pins and poor terminal tension
Swap the relay with a known good identical one, or test it off the vehicle for coil resistance and contact operation
Using a scan tool with bidirectional control, command the high speed fan on and off and watch the response
Check the relay supply voltage and ground with a multimeter against the wiring diagram for that model and engine
Test the control circuit between the relay and the powertrain control module for continuity and shorts
Check fan motor current draw and condition, and only suspect the control module once wiring and relay are proven good

How to fix

Replace the faulty high speed fan ground control relay
Repair or replace damaged wiring and terminals in the control circuit
Clean or replace corroded connectors and restore good ground connections
Replace a blown fuse only after finding and correcting the cause of the overload
Replace the cooling fan motor or assembly if it is shorted or drawing excessive current
Repair or replace the powertrain control module only if testing confirms an internal driver fault

Can I keep driving?

Medium severity

Short, careful journeys are possible, but without reliable high speed fan operation the engine can overheat in traffic or when stationary. Watch the temperature gauge closely and get it fixed soon; stop at once if it climbs towards hot.

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